Articles of the month (November 2016)

It’s that time again. Sure, there may be a lot to do during the month of December, but what better way to procrastinate than to grab a mug of hot chocolate, sit down in front of the fire, and read about some evidence based medicine….

(If that doesn’t sound appealing, you could toss in some earphones while you do your holiday shopping and listen to me and Casey ramble about these papers in the audio version on the BroomeDocs podcast.) Continue reading “Articles of the month (November 2016)”

Articles of the month (February 2016)

There are new sepsis definitions! Hurrah?

Singer M, Deutschman CS, Seymour CW. The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA. 315(8):801-10. 2016. PMID: 26903338 [free full text]

There are new sepsis guidelines. I guess that warrants headline news, and there has been a lot of excitement on the medical internet. However, they are really just the opinions of 19 experts, aren’t backed by any quality prospective data, and probably shouldn’t change your management. If you want to read more, I wrote a full post on the topic: Sepsis 3.0 – No thank you

Bottom line: Talk about qSOFA if you want to sound in the know, but clinically I would ignore this paper


Procedural sedation consent: “Don’t worry, it’s super safe… it’s the Michael Jackson drug.”

Bellolio MF, Gilani WI, Barrionuevo P. Incidence of Adverse Events in Adults Undergoing Procedural Sedation in the Emergency Department: A Systematic Review and Meta-analysis. Academic emergency medicine : official journal of the Society for Academic Emergency Medicine. 23(2):119-34. 2016. PMID: 26801209

What exactly are the risks of procedural sedation? I know them qualitatively, but when having an informed choice conversation, are you able to quote the actual incidence? I know I couldn’t. This is a systematic review and meta-analysis to determine the incidence of adverse events in ED procedural sedation (limited to after 2004). They found 55 articles that covered 9652 procedural sedations. The most common adverse events: hypoxia (40/1000 but only 23/1000 were <90%), vomiting (16/1000), hypotension (15/1000), and apnea (12/1000). The serious adverse events: laryngospasm (4/1000), intubation (1.6/1000), aspiration (1.2/1000). If you are interested, they do break some of these numbers down based on what agent was used. There was a fair amount of heterogeneity in the definitions used in the original studies. Also pediatrics was excluded.

Bottom line: Procedural sedation is safe, but we should have a sense of these numbers for adverse events.


Still not using topical anesthetics for corneal abrasions? Could topical NSAIDs be a better choice?

Calder LA, Balasubramanian S, Fergusson D. Topical nonsteroidal anti-inflammatory drugs for corneal abrasions: meta-analysis of randomized trials. Academic emergency medicine : official journal of the Society for Academic Emergency Medicine. 12(5):467-73. 2005. PMID: 15860701 [free full text]

Most people have heard me rant about the myth that topical anesthetics are harmful in corneal abrasions. (If you haven’t, watch for an upcoming episode of EMCases Journal Jam, or come to the North York General Emergency Medicine Update this year.) However, an essential part of informed choice is reviewing the alternatives. How do topical NSAIDs perform in managing the pain of corneal abrasions? (Hat tip to Nadia Awad @Nadia_EMPharmD for sending me this paper.) This is a systematic review and meta-analysis that identified 11 RCTs (they don’t report the total sample size, but they were all relatively small studies). I find this paper a little hard to follow, because they report 5 high quality studies to be included in the meta-analysis, but then include only 3 in the forrest plot. Looking at just these 3 trials (n=459), topical NSAIDs did decrease pain, with a weighted mean difference of -1.30 (95%CI -1.56 to -1.03) on a 10 point pain scale. There are a few issues with this data. First: it’s hard to interpret a weighted mean difference, but the minimum change on a 10 point pain score generally considered to be clinically important is 1.4. Second: there is a lot of data that could not be included because of the way the original trials were reported. Third: although a formal funnel plot couldn’t be done, the authors admit a possibility of publications bias. Fourth: There is not enough data on safety, but there was at least one recurrent corneal erosion in the NSAID group. Fifth: The funding source of the original trials was not discussed, but it might be important considering that not a single one of the trials had allocation concealment. Finally: the comparison groups were varied, but often just placebo. It might be better to compare to the less expensive oral NSAIDs (or topical anesthetics.)

Bottom line: Topical NSAIDs may decrease pain from corneal abrasions, but I don’t think this data is enough to support using them over other agents (especially considering their cost.)


Xanthrochromia AKA hey Bob, does this look kinda yellow to you?

Chu K, Hann A, Greenslade J, Williams J, Brown A. Spectrophotometry or visual inspection to most reliably detect xanthochromia in subarachnoid hemorrhage: systematic review. Annals of emergency medicine. 64(3):256-264.e5. 2014. PMID: 24635988

This is a systematic review looking at studies (English only) that included patients presenting with a headache who had LPs where the CSF was sent for xanthrochromia. The gold standard for SAH was either angiography or follow up (not perfect). The studies were also highly heterogenous. Not surprisingly, visual inspection, AKA “hey Bob, does this look kinda yellow to you”, was not perfect, with a sensitivity of 84%, specificity of 96%, positive LR of 14.1 and negative LR of 0.35. However, the fancy spectrophotometry was not any better, with a sensitivity of 87%, specificity of 86%, positive LR of 6.6 and negative LR of 0.29. The included studies are not of high enough quality to be sure about any of those numbers. I just don’t understand how we don’t have something better yet – obviously some chemical is turning the fluid yellow – could the makers of super-ultra-sensitive troponins not just create a test that detects whatever this compound is?

Bottom line: Neither method of detecting xanthochromia is perfect, which adds another layer of complexity to the question of who we should be LPing after CT


Foley free pee?

Herreros Fernández ML, González Merino N, Tagarro García A. A new technique for fast and safe collection of urine in newborns. Archives of disease in childhood. 98(1):27-9. 2013. PMID: 23172785

Here is a contribution from Dr. Kate Bingham. You probably know how I feel about getting urines in pediatric patients. (If you don’t, you can read this.) However, for newborns, a urine culture is going to get done. This paper describes a technique to get the urine without a foley. Basically, feed kid, wait 25 min, clean genitals, hold baby under armpits (standing position), tap suprapubic area at 100/min for 30 seconds, then massage low back for 30 seconds. Repeat until pee is produced, and make sure you catch it in specimen bottle. Does it work? Of the 80 patients they tried this on (no comparison group), they were successful in 69 (86%). Median time to sample collection was 45 seconds. My only concern is if I miss the urine and I have to start all over again (maybe after antibiotics). This is interesting, but I so rarely get newborn urines, I will probably stick with a Foley for now.

Bottom line: You can make children pee using this technique. Not sure where to fit that into practice.


I never get tired of talking about nerve blocks

Dickman E, Pushkar I, Likourezos A. Ultrasound-guided nerve blocks for intracapsular and extracapsular hip fractures. The American journal of emergency medicine. 2015. PMID: 26809928

One rebuttal I have often encountered when talking about nerve blocks for hip fractures is that the block is less likely to work in certain fracture patterns. This is a secondary analysis of data from a previously conducted prospective RCT looking at 77 patients and comparing the effectiveness of ultrasound guided femoral nerve block in intracapsular versus extracapsular hip fractures. They were the same, and both were good (pain scores from 6.5/10 just under 4/10 at 2 hours).

Bottom line: I will keep using nerve blocks for all hip fractures. I’m not too worried about the location of the fracture.


Diverticulitis – antibiotics, seeds, or exercise

Stollman N, Smalley W, Hirano I, . American Gastroenterological Association Institute Guideline on the Management of Acute Diverticulitis. Gastroenterology. 149(7):1944-9. 2015. PMID: 26453777

This is the new acute diverticulitis guideline from the American Gastroenterological Association Institute (that was as hard to type as it was to read.) I found three of their recommendations interesting:

  • “The AGA suggests that antibiotics should be used selectively, rather than routinely, in patients with acute uncomplicated diverticulitis. (Conditional recommendation, low quality of evidence).” (They note that so far the RCTs showing no benefit of antibiotics have been in inpatients with CT proven diverticulitis.)
  • “The AGA suggests against routinely advising patients with a history of acute diverticulitis to avoid consumption of nuts and popcorn. (Conditional recommendation,very-low quality of evidence).” This is another one of those myths that we breeze over, but can really ruin patients’ quality of life
  • “The AGA suggests advising patients with diverticular disease to consider vigorous physical activity. (Conditional recommendation, very low quality of evidence).” This makes sense, but it has not been part of my discharge script – until now.

People are going to start thinking I have a personal vendetta against antibiotics

Gágyor I, Bleidorn J, Kochen MM, Schmiemann G, Wegscheider K, Hummers-Pradier E. Ibuprofen versus fosfomycin for uncomplicated urinary tract infection in women: randomised controlled trial. BMJ (Clinical research ed.). 351:h6544. 2015. PMID: 26698878 [free full text]

Are antibiotics useful in UTI? I actually think so, but there have been previous studies that illustrate that a lot of UTIs will clear on their own. This was a randomized, double dummy, placebo controlled trial in which 484 women (18-65 years old) received either fosfomycin 3 grams PO or ibuprofen 400mg TID for three days. 69% of the women in the ibuprofen only group had complete resolution of their symptoms, and didn’t use any antibiotics in the next 28 days. That is impressive, but the antibiotics did provide some benefit. The ibuprofen group had more dysuria, based on their definition of ‘non-inferiority’, although the actual numbers for pain look pretty similar. Also there were 5 patients in the ibuprofen group who developed pyelonephritis as compared to only one in the fosfomycin group, although the difference was not statistically significant (p=0.12). I think antibiotics help, but this study reminds us that if you are on the fence, there is no reason to rush the antibiotics. Nearly 7/10 women will clear their UTI without your help. Also, if you call someone back with a positive culture, but they no longer have symptoms, they almost certainly don’t need treatment (assuming they aren’t pregnant).

Bottom line: Antibiotics probably help in UTIs, just not as much as you think


One more time: dex is as good as pred in asthma

Cronin JJ, McCoy S, Kennedy U. A Randomized Trial of Single-Dose Oral Dexamethasone Versus Multidose Prednisolone for Acute Exacerbations of Asthma in Children Who Attend the Emergency Department. Annals of emergency medicine. 2015. PMID: 26460983

I have covered this topic before, but repetition is key in both science and education. This was a randomized, open-label non-inferiority trial comparing a single dose of dexamethasone (0.3mg/kg orally) to prednisolone (1mg/kg PO for 3 days) in 245 children aged 2-16 with known asthma. There was no difference in the primary outcome of PRAM score at day 4 (0.91 versus 0.91; absolute difference 0.005; 95%CI 0.35 to 0.34), although I am not sure this is the most clinically important outcome. There weren’t any differences in the secondary outcomes, such as admission to hospital, length of stay, or return visits.

Bottom line: Once again, dex is great for asthma


Sticking with obvious pediatric topics: ondansetron works

Danewa AS, Shah D, Batra P, Bhattacharya SK, Gupta P. Oral Ondansetron in Management of Dehydrating Diarrhea with Vomiting in Children Aged 3 Months to 5 Years: A Randomized Controlled Trial. The Journal of pediatrics. 169:105-109.e3. 2016. PMID: 26654135

This is another paper I might have skipped because the results seem obvious, but I have recently seen it argued that we use ondansetron too liberally, so I guess it’s worth looking at. This is a well done, double blinded, placebo controlled RCT that enrolled 170 children between 3 months and 5 years of age with acute vomiting and diarrhea and clinical signs of dehydration. Although I worry that the primary outcome of failure of ORT, defined as features of some dehydration after 4 hours of ORT, is a little subjective, the trial was appropriately blinded and placebo controlled. Failure was 31% with ondansetron as compared to 61.5% with placebo, an absolute risk reduction of 30%, or a NNT of about 3. The 30% failure rate does seem high to me though, as I almost never have a kid fail ORT.

Bottom line:  Surprise? Ondansetron does help vomiting kids orally hydrate.


When your heart leaves you speechless

Wasserman JK, Perry JJ, Dowlatshahi D. Isolated transient aphasia at emergency presentation is associated with a high rate of cardioembolic embolism. CJEM. 17(6):624-30. 2015. PMID: 25782453

This is a prospective cohort of 2360 TIA patients, 41 of whom had isolated aphasia at the time of presentation. Patients with isolated aphasia were twice as likely to have a cardiac source of embolism (22.0% vs 10.6%, p=0.037). This is strong, believable data, but I disagree with the authors’ conclusion that “emergency patients with isolated aphasia with a TIA warrant a rapid and thorough assessment for a cardioembolic source”. Non-aphasic patients still had an 11% chance of a cardiac source as compared to 22% with aphasia. Those two numbers clearly necessitate the exact same work up.

Bottom line: This is interesting trivia, but the association of aphasia with cardioembolism is clinically irrelevant.


A Salter Harris Myth Update

Boutis K, Plint A, Stimec J. Radiograph-Negative Lateral Ankle Injuries in Children: Occult Growth Plate Fracture or Sprain? JAMA pediatrics. 170(1):e154114. 2016. PMID: 26747077

Almost everyone has heard my Salter 1 Rant. Here is some more evidence. This is a prospective cohort of 140 children between 5 and 12 years of age with clinically suspected Salter Harris 1 fractures of the ankle. They were all treated with a removable splint (yes – the pediatric tertiary centers are doing this, so you can too). Then all of the children had an MRI at one week. Of the 140 children, 108 had ligamentous injuries on MRI. So take home #1: Despite the old dogma about ligaments being stronger than pediatric bone, children do get ligamentous injuries. Another 27 had isolated bone contusions. Only 4 children (3.0%, 95% CI 0.1-5.9%) actually has Salter Harris 1 fractures, and only 2 of those had any evidence of growth plate injury. And even more important, at 1 month follow up, there was no difference in function between those with MRI confirmed fracture and those without.

Bottom line: Salter Harris 1 fractures are rare and of questionable clinical relevance. Stop casting all these kids.


How important are c-spine precautions in submersion victims?

Watson RS, Cummings P, Quan L, Bratton S, Weiss NS. Cervical spine injuries among submersion victims. The Journal of trauma. 51(4):658-62. 2001. PMID: 11586155

This is a chart review of all submersion victims in the Seattle area between 1974 and 1996. There were a total of 2244 submersion victims, 34% of whom survived until hospital discharge. The prevalence of c-spine injury was 0.49% overall and 0.38% of those who received any medical care (not pronounced dead on scene). All people with c-spine injuries had obvious trauma. (One, for example, was a victim from a plane crash.) The biggest pitfall of this chart review is that someone with a spine injury from submersion might only be coded as a spine injury at discharge, because that was the important injury. These patients would not have been found by the review. However, this isn’t the only reason to be skeptical of cervical collars, so I have no problem removing it if I need better access to a submerged patient’s airway.

Bottom line: A submerged patient is very unlikely to have a c-spine injury if there isn’t obvious signs of trauma


Modified Sgarbossa criteria – now for more than just ECG geeks?

Meyers HP, Limkakeng AT, Jaffa EJ. Validation of the modified Sgarbossa criteria for acute coronary occlusion in the setting of left bundle branch block: A retrospective case-control study. American heart journal. 170(6):1255-64. 2015. PMID: 26678648

This paper is worth a look, if just to review some ECGs. It is a retrospective case-control study looking to validate a modified Sgarbossa rule for diagnosing STEMI in LBBB. This rule uses the ratio of ST elevation to S wave, rather than a set 5mm cut off for the anterior leads. Based on their 258 patients (only 9 with true STEMI), they report a better sensitivity than the original criteria (80% vs 49%, p<0.001) and equal specificity (99% vs 100% p=0.5). I already use these criteria, but I think we should be cautious about the current evidence base. This is retrospective and based on only 9 patients with acute coronary occlusion. More importantly, I wonder about the inter-rater reliability when we are taking multiple measurement in millimetres and dividing them. I already know from reading Dr Smith’s (excellent) blog that he frequently sees small amounts of ST depression that I would have missed or measured differently.

Bottom line: Like many things on the ECG, proportion probably matters, but it isn’t well studied.

Read more on Dr. Smith’s blog here, here, or here.


 

How many diseases can you diagnose at 20 feet?

Narayana S, McGee S. Bedside Diagnosis of the ‘Red Eye’: A Systematic Review. The American journal of medicine. 128(11):1220-1224.e1. 2015. PMID: 26169885

I’ll just do a very quick note on this systematic review. because I found two numbers interesting. For ruling in “serious eye disease”, photophobia is good (LR+ = 8.3; 95%CI 2.7 – 25.9), but photophobia by indirect illumination (shining the light in the opposite eye) is amazing (LR+ = 28.8; 95%CI 1.8 – 459). The other number I found interesting is that bacterial conjunctivitis can almost be ruled out by “failure to observe a red eye at 20 feet”, although I am not sure there is huge clinical value of differentiating bacterial from viral conjunctivitis.

Bottom line: Worth a read through if you want to better understand your eye exam.


Intralipid review

Hoegberg LC, Bania TC, Lavergne V. Systematic review of the effect of intravenous lipid emulsion therapy for local anesthetic toxicity. Clinical toxicology (Philadelphia, Pa.). 2016. PMID: 26853119

Another quick one: A systematic review of intralipid therapy in local anesthetic toxicity. It might be worth a deep dive, but the quality of the evidence is just so poor that it’s hard to trust any conclusions. For what it is worth, they conclude that intralipid appears effective, but there is no evidence that it is more effective than vasopressors.

My real reason for bringing this up is to lament the quality of toxicology literature in general. I have heard people argue that it would be unethical to randomize these dying patients in order to get good data, but we have to remember that in the absence of good data, the care they are getting is entirely random anyway. The random factor is just the belief of the physician who happens to be on that day. Although these are rare cases, we have the technology to gather data from around the world. We need to do better.

Bottom line: I will probably use intralipid if this comes up, but we really need better science in toxicology.


Osteoarthritis is not an xray diagnosis

Kim C, Nevitt MC, Niu J. Association of hip pain with radiographic evidence of hip osteoarthritis: diagnostic test study. BMJ (Clinical research ed.). 351:h5983. 2015. PMID: 26631296 [free full text]

This study looks at data from 2 large cohort studies: The Framingham study (in which every patient over 50 got a pelvic x-ray, regardless of symptoms) and the osteoarthritis initiative study (which included 4366 patients thought to be at risk for knee arthritis, and again everyone was imaged.) Xray is not predictive of osteoarthritis. In Framingham, only 15.6% of patients with frequent pain (clinical OA) had radiographic evidence of OA and only 20.7% of those patients whose xray indicated OA actually had clinical symptoms. Likewise, In the osteoarthritis initiative study, only 9.1% of patients with symptoms had xray changes, and only 23.8% of patients with xray changes had symptoms.

Bottom line: Xray cannot provide any valuable information about osteoarthritis of the hip


Should we let residents use Google on shift?

Kim S, Noveck H, Galt J, Hogshire L, Willett L, O’Rourke K. Searching for answers to clinical questions using google versus evidence-based summary resources: a randomized controlled crossover study. Academic medicine : journal of the Association of American Medical Colleges. 89(6):940-3. 2014. PMID: 24871247 [free full text]

Rushing around the emergency department, it is obviously tempting to just google something rather than find a specific medical resource, but how good is google? This is a prospective, randomized, controlled, crossover study in which they took 48 internal medicine residents and asked them to answer a series of medical questions. They were randomized to answer 5 questions, either using Google or using their choice of DynaMed, First Consult, or Essential Evidence Plus. They then ‘crossed over’ and answered another 5 questions using the opposite tool. This was repeated for 48 weeks. There was no difference in time to correct answer, response rate, or accuracy. They found answers for 80% of the questions, but the correct answer in only 60%.

Bottom line: Google doesn’t look worse than these specific medical tools, but I really want my residents to be right more than 60% of the time in an open book test.


Cheesy Joke of the Month

What did the pirate say on his 80th birthday?

Aye Matey


 

#FOAMed of the Month

I often lament the current state of medical science. Data is unreported. Secondary outcomes are reported as primary. Harm outcomes aren’t even mentioned.

COMPare (CEBM Outcome Monitoring Project) is a group of people trying to fix this. You can read a short blog post about it here. In short, they compare publications with the original trial protocol, report discrepancies, write letters to the editors, and report on their progress. It’s an interesting project that is worth checking out.

 

However, I guess that’s not really education, so I will add a second #FOAMed selection:

Have ever heard of BRASH syndrome? You’ve probably seen it, but if you are like me, you had probably never heard of it before this month:

BRASH syndrome on PulmCrit

 

Articles of the month (December 2015)

A monthly collection of the most interesting emergency medical literature I have encountered.

Another month and another set of articles proving only that I probably should have spent more time Christmas shopping and less reading journals. Enjoy…

Peripheral thermometers mostly suck, but does it matter?

Niven DJ, Gaudet JE, Laupland KB, Mrklas KJ, Roberts DJ, Stelfox HT. Accuracy of Peripheral Thermometers for Estimating Temperature: A Systematic Review and Meta-analysis. Annals of internal medicine. 163(10):768-77. 2015. PMID: 26571241

I will start this month with a paper just for my friend Dr. Scott Kapoor. This is a systematic review and meta-analysis of 75 studies encompassing 8682 patients looking to compare the accuracy of peripheral thermometers to central thermometers. The peripheral thermometers are not very accurate, especially if you look at hypo or hyperthermia. If you take the core temperature as the gold standard, the peripheral thermometers had a pooled sensitivity and specificity of 64% (95%CI 55-72%) and 96% (95%CI 93-97%) respectively for fever. I don’t have access to the appendices to look at the raw data, but the authors report that all peripheral thermometers were equally bad, with axillary probably being the worst. So sorry Scott, it’s not just the temporal artery thermometers that don’t work, it’s everything peripheral. Luckily, for the vast majority of people being triaged, temperature is irrelevant. For patients you care about, you probably should recheck a core temp.

Bottom line: There is a very good chance peripheral thermometers will miss a fever.


If all your friends jumped off a bridge…

Douketis JD, Spyropoulos AC, Kaatz S. Perioperative Bridging Anticoagulation in Patients with Atrial Fibrillation. The New England journal of medicine. 373(9):823-33. 2015. PMID: 26095867 [free full text]

We frequently admit patients on anticoagulants who will require surgery or procedures that require their anticoagulants to be held. Should we be bridging these patients with some kind of heparin? This is a randomized controlled trial of 1884 adult patients with chronic atrial fibrillation and at least 1 CHADS2 risk factor undergoing surgery (excluding cardiac, neuro, and spinal surgeries). They were randomized to either bridging with dalteparin or placebo. Patients were excluded if the had a mechanical heart valve, recent stroke, or renal failure. The primary outcome of any arterial thromboembolic disease was noninferior, with 4 patients (0.4%) in the non-bridged group and 3 patients (0.3%) in the bridged group having events. Major bleeding was higher in the bridged group (29 patients (3.2%) versus 12 patients (1.3%) p=0.005 NNH=53). Minor bleeding was also increased (20% versus 12%, p<0.001, NNH=11).

Bottom line: This is probably the best evidence to date that the short term risk for atrial fibrillation patients off anticoagulation is low and that bridging therapy is harmful.

Steinberg BA, Peterson ED, Kim S. Use and outcomes associated with bridging during anticoagulation interruptions in patients with atrial fibrillation: findings from the Outcomes Registry for Better Informed Treatment of Atrial Fibrillation (ORBIT-AF). Circulation. 131(5):488-94. 2015. PMID: 25499873 [full free text]

This is a retrospective look at a large atrial fibrillation patient registry. They looked at the 2803 patients with non-valvular atrial fibrillation who had an interruption in their anticoagulation, primarily for non-cardiac surgery or endoscopy. 77% of patients were not bridged as compared to 23% who were. Overall adverse events were higher in the bridging group (5.3% versus 2.8% p=0.01), primarily driven by excess bleeding complications. Stroke and MI were not different between the groups. Of course, patients were not randomized, so there were likely reasons that physicians chose to bridge some patients and not others, making any concrete conclusions difficult.

Bottom line: More evidence that bridging is not helpful

As a side note, if all my friends jumped off a bridge, you can bet that I would too. My friends are all sane and mostly intelligent. If they were jumping off a bridge, there is probably a very good reason to do so, like the bridge is on fire or there is rapidly approaching school of flying sharks with lasers on their heads. Also, even if they happened to die, who wants to live in a world where all your friends just died jumping off a bridge?


OK, those were boring topics. Let’s move on: anyone have a VIP guest in the department this holiday season?

Straube S, Fan X. The occupational health of Santa Claus. Journal of occupational medicine and toxicology (London, England). 10:44. 2015. PMID: 26692887 [free full text]

Sadly, this article was a little boring even for a Christmas spoof – but have you ever considered the extreme occupational hazards of Santa Claus? Don’t be surprised if he ends up in an ED near you sometime soon.


Christmas: so many new toys, with so many small parts. It’s the perfect storm for foreign bodies in the airway

Eren S, Balci AE, Dikici B, Doblan M, Eren MN. Foreign body aspiration in children: experience of 1160 cases. Annals of tropical paediatrics. 23(1):31-7. 2003. PMID: 12648322

This is a retrospective review of 1160 children (under 15 years of age) who underwent bronchoscopy for foreign bodies. Almost 2/3rds of the patients with foreign bodies had negative radiography. (There is obviously a selection bias here, because these are only the children in whom the clinicians were concerned enough to perform a bronchoscopy). I will also note that this is an interesting population, because 38% of the foreign bodies were watermelon seeds. However, with a good story, xray is clearly not good enough to exclude foreign bodies.

Bottom line: It is often a difficult sell, but if a child has a good story for aspiration, they probably need a bronchoscopy.


 High flow nasal oxygen in the ED

Bell N, Hutchinson CL, Green TC, Rogan E, Bein KJ, Dinh MM. Randomised control trial of humidified high flow nasal cannulae versus standard oxygen in the emergency department. Emergency medicine Australasia : EMA. 2015. PMID: 26419650

This is an unblinded prospective randomized control trial comparing high flow nasal oxygen to standard care (nasal prongs or face mask) in 100 adult emergency department patients with shortness of breath, a respiratory rate over 24 and an oxygen saturation less than 94%. There were 2 primary outcomes, which is not good from a trial design perspective. For the outcome of a reduction in respiratory rate by 20% within 2 hours, the high flow nasal group was better (66.7% vs 38.5%, p=0.005). For the outcome of an escalation of ventilation requirement, the reported outcomes are less clear, because they included being changed from face mask to high flow nasal oxygen as an “escalation of care”, even though this trial is supposed to be determining if it is any better. Two patients in each group required non-invasive positive pressure ventilation, and one patient was intubated. So I would say there was no change in patient oriented outcomes except the single intubation, and a single outcome is just not enough to draw any conclusions from.

Bottom line: Not a lot to go on here, but it doesn’t look like high flow nasal oxygen will be worse than usual care.


 One step closer to forgetting antibiotics in diverticulitis

Isacson D, Thorisson A, Andreasson K, Nikberg M, Smedh K, Chabok A. Outpatient, non-antibiotic management in acute uncomplicated diverticulitis: a prospective study. International journal of colorectal disease. 30(9):1229-34. 2015. PMID: 25989930

I have previously talked about the few RCTs indicating that antibiotics might not help in diverticulitis. It is an interesting topic, so I will include new evidence as I find it. This is a prospective cohort of 155 adult patients diagnosed with acute uncomplicated diverticulitis who were managed as outpatients without antibiotics, just pain control and a diet progressing from liquids back to full, as tolerated. Of the 155 patients, only 4 patients (2.5%) failed this outpatient management strategy – which isn’t much different from what you would expect if they had been treated with antibiotics. The biggest problem with this data set is that it doesn’t represent consecutive patients. 66 patients with uncomplicated diverticulitis were seen during the study period but were not enrolled, so there could be some selection bias. There was no control, so antibiotics could have lowered complication rates further – but for the 97.5% of patients without complications, it doesn’t seem that antibiotics were necessary.

Bottom line: A little more evidence indicating that antibiotics may be unnecessary for diverticulitis after all.


 How do fish get high? Seaweed

Vandrey R, Raber JC, Raber ME, Douglass B, Miller C, Bonn-Miller MO. Cannabinoid Dose and Label Accuracy in Edible Medical Cannabis Products. JAMA. 313(24):2491-3. 2015. PMID: 26103034 [free full text]

With legal marijuana on the horizon in Canada, there are many questions we need to be asking about its use. One very basic question is: at current marijuana dispensaries, how accurate are labels with regards to THC content? Individuals were sent out to buy marijuana in San Francisco, Los Angeles, and Seattle, and the THC content was analyzed by liquid chromatography. Of 75 total samples, 13(17%) were accurately labelled, 17(23%) were under-labelled (contained more THC than the label stated), and 45 (60%) were over-labelled. Errors were frequently large, up to 55% under labelled and 99% over labelled. Combined with confusion over appropriate doses, highly concentrated doses in edibles, and differing rates of absorption, dosing errors make it more likely that marijuana users will end up in the ED.

Bottom line: Active ingredients in marijuana products are not well regulated or labelled on available products.


Monthly poll: Who would want this ENT surgeon as their own doctor?

Leopard DC, Williams RG. Nasal Foreign Bodies: A Sweet Experiment. Clinical otolaryngology : official journal of ENT-UK ; official journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery. 40(5):420-1. 2015. PMID: 25639608

There are many techniques to get foreign bodies out of children’s noses, but what do you do if they don’t work? Well, if it’s a hard candy, you may not need to do anything. This (presumably bored) ENT surgeon placed 5 different candies in his own nose (Fizzers, Tic Tac, Smarties, Skittles, and Polo mints) and then had the second author perform rhinoscopy every 5 minutes. All 5 candies were completely dissolved in less than an hour. I will let you perform your own critical appraisal of these methods.

Bottom line: Watchful waiting may be reasonable for children with hard candies in their noses.

(In case you were wondering, I would happily take this chap as my doctor)


Alcohol by mouth can make you vomit. On the other hand, alcohol in the nose…

Beadle KL, Helbling AR, Love SL, April MD, Hunter CJ. Isopropyl Alcohol Nasal Inhalation for Nausea in the Emergency Department: A Randomized Controlled Trial. Annals of emergency medicine. 2015. PMID: 26679977

This is a randomized trial of a convenience sample of 80 adult patients presenting to the emergency department with a chief complaint of nausea and/or vomiting. Patients were instructed to inhale from a pad of either saline or isopropyl alcohol (the same wipes you would use on the skin before starting an IV) immediately, then 2 and 4 minutes later. Although investigators covered the label of the wipe, I’m pretty sure blinding was eliminated the instant the patient took a sniff. Nausea was measured on a scale of 0 to 10, but only for the first 10 minutes. At the start of the study, patients rated their nausea as a 6/10. At 10 minutes, the saline group still rated their nausea as 6/10 whereas the alcohol group rated theirs as 3/10 (absolute difference 3, 95%CI 2-4 p<0.001). We don’t know what happened after 10 minutes, which is a major limitation. Some other major limitations of this data are the lack of blinding and potential selection bias in a convenience sample.

Bottom line: Maybe inhaling from alcohol wipes decreases nausea

Hines S, Steels E, Chang A, Gibbons K. Aromatherapy for treatment of postoperative nausea and vomiting. The Cochrane database of systematic reviews. 4:CD007598. 2012. PMID: 22513952

Although I was completely unaware of this therapy for nausea, apparently it has been studied before. This Cochrane review found 6 RCTs and 3 non-randomized controlled trials looking at aromatherapy for nausea and vomiting. When compared to placebo, they found that isopropyl alcohol vapour inhalation reduced the number of patients requiring rescue antiemetics (RR 0.30 95%CI 0.09-1.0, p=0.05 so technically not significant), however it was less effective in reducing nausea than standard anti-emetic medications.

Bottom line: Probably shouldn’t be first line, but if I’m huffing alcohol in the break room, it may be because I caught the gastro that’s going around.

For some more on this topic, you can read about it on Academic Life in Emergency Medicine


Nerves were meant for blocking

Flores S, Herring AA. Ultrasound-guided Greater Auricular Nerve Block for Emergency Department Ear Laceration and Ear Abscess Drainage. The Journal of emergency medicine. 2015. PMID: 26589558

This is just a case report, but considering the frequency with which we see ear injuries, and the difficulty of achieving good local anesthesia, having a ultrasound guided nerve block in your back pocket is a great tool. In this article they specifically identify and anesthetize the greater auricular nerve, but a superficial cervical plexus block will get you the same coverage and might be easier. These nerve blocks only cover the posterior aspect of the ear, so you may have difficulty if the injury is more anterior. They can also miss the top of the ear.

Bottom line: Nerve blocks are fantastic for many things in the ED, especially when using ultrasound guidance.

Don’t have access to this paper? You could read about the ultrasound guided superficial cervical plexus block on NYSORA. You could also watch a video on the superficial cervical plexus block on the ultrasound podcast.


We have many effective treatments for hyperkalemia – kayexalate just isn’t one of them

Hagan AE, Farrington CA, Wall GC, Belz MM. Sodium polystyrene sulfonate for the treatment of acute hyperkalemia: a retrospective study. Clinical nephrology. 85(1):38-43. 2016. PMID: 26587776

The evidence behind the use of sodium polystyrene sulfonate (kayexalate) for hyperkalemia is poor. This is a chart review looking at 501 patients who received SPS for hyperkalemia. The chart review methods make it difficult to assess the true effect, but on average after SPS administration, the potassium decreased by 0.93mEq/L. That sounds reasonable, until you realise that the drop occurred over about 8 hours and that most of these patients were given other medications as well. The really concerning part of this paper is that there were 2 cases of bowel necrosis, a known side effect of SPS.

Bottom line: A little more evidence that reinforces my current practice – I don’t use kayexalate to treat hyperkalemia in the ED.

Want to read a little more about the original studies on kayaexalate? Check out this post by Anand Swaminathan on R.E.B.E.L.EM.


Newer is always better, right?

Navarro V, Dagron C, Elie C. Prehospital treatment with levetiracetam plus clonazepam or placebo plus clonazepam in status epilepticus (SAMUKeppra): a randomised, double-blind, phase 3 trial. The Lancet. Neurology. 15(1):47-55. 2016. PMID: 26627366

We all know the downsides of phenytoin in seizures – so it makes sense that researchers are looking at newer (but more expensive) agents. In this industry-funded, randomized, double-blind prehospital trial, they compared clonazepam plus levetiracetam (Keppra) to clonazepam plus placebo in 203 patients with status epilepticus (a seizure lasting more than 5 minutes). The trial was stopped early because an interim analysis revealed no chance that levetiracetam would turn out to be superior to placebo.

Bottom line: Don’t start changing your status epilepticus algorithms yet

Mundlamuri RC, Sinha S, Subbakrishna DK. Management of generalised convulsive status epilepticus (SE): A prospective randomised controlled study of combined treatment with intravenous lorazepam with either phenytoin, sodium valproate or levetiracetam–Pilot study. Epilepsy research. 114:52-8. 2015. PMID: 26088885

This paper complements the last. This is a prospective randomized trial of 150 patients with status epilepticus comparing valproate, phenytoin, and levetiracetam (all in addition to lorazepam). There was no statistical difference between the groups. Because of the small numbers, this is the kind of trial that could miss a clinically significant difference just because it wasn’t statistically different (type 2 error).

Bottom line: Again, there is no reason to abandon our tried and true and cheap medication yet


 Has it been cold enough for leaky gas powered heaters yet?

Hampson NB. Myth busting in carbon monoxide poisoning. The American journal of emergency medicine. 2015. PMID: 26632018

I couldn’t resist this paper – it had “myth” in the title and who doesn’t love carbon monoxide? There isn’t much to say about the the methods, as there were none, but there are a few important review points:

  1. Carbon monoxide levels do not correlate with symptoms and should not be the primary driver of emergency care
  2. A venous blood gas is just as good as an arterial gas for measuring CO levels
  3. CO is very stable in blood samples. You don’t need to rush an iced sample to the lab. In samples of anticoagulated blood, CO levels didn’t change over the course of a month. So this test could be done as an add-on if you forgot to order it initially

Bottom line: Read the three points above – stop trying to just skip to the red text to get your answers quickly

This paper was also covered on the poison review


NOT EMERGENCY MEDICINE, but in headlines everywhere

Jacobs IJ, Menon U, Ryan A et al. Ovarian cancer screening and mortality in the UK Collaborative Trial of Ovarian Cancer Screening (UKCTOCS): a randomised controlled trial. The Lancet. 2015. [free full text]

“Ovarian Cancer Screening Could Reduce Deaths By As Much As 20 Percent”. That is the first headline I encountered, but there are many many more. Expect to hear about this from patients, family, and friends alike. But what did the study actually show? This is a massive prospective trial that randomized 202,638 women into one of two screening protocols or a control group. Like so many cancer trials, the authors unfortunately started the trial very confused and made their primary outcome the factitious ‘disease specific mortality’ instead of all cause mortality. THEY DON’T EVEN REPORT ALL CAUSE MORTALITY! How can you tell if an intervention saves lives if you don’t measure mortality? Disease specific mortality only tells you that there might be changes in what someone happened to write on a death certificate (almost never supported by an autopsy), so is clearly not a patient oriented outcome. That is such a fatal flaw that it is hardly worth noting that there was a significant selection bias (in that healthy individuals are much more likely to volunteer for a study like this), that they had to alter the study protocol part way through, and that if you use the primary statistical outcome listed in the original trial design none of the outcomes were statistically significant. So throw this one into the trash heap, but be prepare for a lot of questions about how this could be the next big thing.

Bottom line: We need to get cancer researchers to start measuring and reporting all cause mortality. Our patients are being confused and harmed by the statistical misinformation that results from the fictional concept of ‘disease specific mortality’

You can read a much more through an intelligent review of this paper by the amazing Casey Parker on Broome Docs.


Cheesy joke of the month

What do you get if you eat Christmas decorations?


Tinsilitis!


#FOAMed of the month

A few videos that demonstrate why you should have a PEEP valve already attached to every BVM you use in the ED (rather than hidden in an RT office somewhere):

Lung Recruitment by Apneic CPAP by George Kovacs via EMCrit

PEEP your glove by George Kovacs

Amazing PEEP 1 –  BVM by AIME

Amazing PEEP 2 – ETT by AIME

Oxygenation – Understanding your BVM Device 2 by George Kovacs

When I started this month’s articles, I only planned on including the videos on the PEEP valve, but then Dr. Kovacs had to release one of the best awake intubation videos ever made. In the end, fully awake, he will show you his own carina:

Airway topicalization for an awake carina selfie

So bottom line of all this, follow George Kovacs and AIME on youtube

Articles of the month (August 2015)

A monthly collection of the most interesting emergency medical literature I have encountered

Here is this month’s summary of my favorite reads from the medical literature.

Simple and brilliant: A pediatric rainbow

Moreira ME, Hernandez C, Stevens AD, et al. Color-Coded Prefilled Medication Syringes Decrease Time to Delivery and Dosing Error in Simulated Emergency Department Pediatric Resuscitations. Ann Emerg Med. 2015;66:(2)97-106.e3. PMID: 25701295

Pediatric resuscitations are stressful at the best of times and pediatric medication doses can be complicated, increasing the risk of medication errors. This group came up with an ingenious solution: single pre-filled syringes that are color-coded in a rainbow pattern that corresponds to the Broselow tape we all know and love. All you have to do is discard down to the color that corresponds to the size of the child and you are sure to be giving the right dose (best explained by looking at a picture).This study assessed the speed and accuracy of medication administration in simulated pediatric resuscitations. 10 teams consisting of physicians and nurses participated in a cross over study, so that they did one simulation with the new syringes and one without. Time to delivery of medications was quicker with the new syringes (47 versus 19 seconds, a difference of 27 seconds; 95%CI 21-33 seconds). Teams were also more accurate using the new color-coded syringes, with dosing errors occurring 17% of the time with the conventional approach and 0% of the time with the new syringes (absolute difference 17%; 95% CI 4-30%). Obviously a simulation based study is not real life – but I would actually expect more stress and therefore more errors during a real resuscitation.

Bottom line: Simple. Brilliant. Worth looking into.

The same group replicated basically the same study with similar results, but this time running the simulations with paramedics:

Stevens AD, Hernandez C, Jones S, et al. Color-coded prefilled medication syringes decrease time to delivery and dosing errors in simulated prehospital pediatric resuscitations: A randomized crossover trial. Resuscitation. 2015. PMID: 26247145


Fingers, toes, nose and hose. The epinephrine myth

Ilicki J. Safety of Epinephrine in Digital Nerve Blocks: A Literature Review. J Emerg Med. 2015. PMID: 26254284

I’ve talked about this before, but possibly not in the articles of the month. This is a systematic review looking at the safety of using epinephrine in digital nerve blocks. They found a total of 39 relevant articles, although only 12 of them were RCTs. They report no cases of necrosis attributable to epinephrine. In total, they found 2797 reported cases of digital nerve blocks using epinephrine without any important complications.

Bottom line: This was a myth. Epinephrine is almost certainly safe in fingers and toes if you think it might help you.


Physicians might not be so great around genitals

Stewart CM, Schoeman SA, Booth RA, Smith SD, Wilcox MH, Wilson JD. Assessment of self taken swabs versus clinician taken swab cultures for diagnosing gonorrhoea in women: single centre, diagnostic accuracy study. BMJ. 2012;345:e8107. PMID: 23236033 [free full text]

This is a prospective cohort of 3859 women aged 16 and over who presented to a single sexual health clinical in the UK. Before undergoing their consultation, they were asked to perform a vulvovaginal swab on themselves which was sent for nucleic acid amplification (NAAT). They then had the normal examination by the physician, with urethral and endocervical swabs sent, both for NAAT and culture. Overall, 2.5% of women tested positive for gonorrhoea (using a gold standard of either positive culture or two different NAAT markers being positive.) The self swabs were the most sensitive (99%), followed by physician swab for NAAT (96%), with the endocervical culture being the least sensitive (81%). In patients with symptoms suggestive of STI, both physician and self swab NAAT were 100% sensitive, but the endocervical culture was only 84% sensitive.

Bottom line: Self taken swabs were the most sensitive at detecting gonorrheal infection in these women

Schoeman SA, Stewart CM, Booth RA, Smith SD, Wilcox MH, Wilson JD. Assessment of best single sample for finding chlamydia in women with and without symptoms: a diagnostic test study. BMJ. 2012;345:e8013. PMID: 23236032 [free full text]

This is another study by the same group, using essentially the same methods, but this time focusing on Chlamydia. They included a total of 3973 women. Again, the self swab outperformed the physician performed swab with a sensitivity of 97% (95%CI 95-98%) as compared to 88% (95%CI 85-91%). The reported specificity of 100% is essentially meaningless because they were using the test itself as the gold standard. Similarly, the sensitivity of both tests might be lower than reported as they were not compared to any other gold standard.

Bottom line: Women do a better job collecting swabs for Chlamydia than physicians do

Overall Bottom line: If there is not another reason for a speculum exam, it does not have to be performed solely to obtain cervical swabs. Unfortunately urine testing was not included in these studies, so we do not know how it compares to self swabs.


Using tamsulosin for kidney stones? You must not be reading these e-mails.

Furyk JS, Chu K, Banks C, et al. Distal Ureteric Stones and Tamsulosin: A Double-Blind, Placebo-Controlled, Randomized, Multicenter Trial. Ann Emerg Med. 2015. PMID: 26194935 [free full text]

This is a prospective, randomized, double-blind trial of 403 adults with CT confirmed ureteric stones comparing tamsulosin 0.4mg daily to placebo. There was no benefit for the primary outcome of stone expulsion at 28 days, with 87% passed in the tamsulosin group and 81.9% in the placebo group (5.1% difference; 95%CI -3 to 13%). There was a difference in a secondary outcome, distal stones sized 5-10mm, with 83.3% passing as compared to 61%. Of course this is a secondary outcome, so should not affect your practice. More importantly, the vast majority of these people should not being getting imaged, so you will never know the size of the stone, making this information clinically useless. There was no difference in urologic interventions, pain, or analgesia requirements.

Bottom line: Tamsulosin doesn’t help patients with ureteric stones.


Just in case that wasn’t enough to convince you

Berger D, Ross M, et al. Tamsulosin does not increase one-week passage rate of ureteral stones in Emergency Department patients. Am J Emerg Med. 2015. In Print. PMID:

This is yet another paper indicating tamsulosin has no role in ureterolithiasis. (Its too bad we can’t just start with the high quality studies, rather than following the predictable pattern of a handful of garbage studies showing questionable benefit followed by a lot of time and money spent on multiple good trials that prove that there was never any benefit.) This was a prospective, double-blind RCT with 127 adult patients with CT confirmed ureterolithiasis, randomized to either tamsulosin 0.4mg daily or placebo. There was no difference in the number of patients in whom the stone did not pass (tamsulosin 62.1% 95CI 49-75%; placebo 54.4% 95%CI 40-67%.) There was also no difference in pain scores or analgesic use.

Bottom line: There is no reason to be using tamsulosin in renal colic patients.


Sticking with urology: systematic reviews are pointless if there isn’t any original literature

Hulme P and Wylie K. Towards evidence based emergency medicine: best BETs from the Manchester Royal Infirmary. BET 1: tranexamic acid in life-threatening haematuria. Emerg Med J. 2015;32:(2)168-9. PMID: 25605262

They decided to do a review of tranexamic acid use in life-threatening hematuria. They managed to find 3 case reports and 1 prospective observational trial of 8 patients. There were no controls, so its hard to know what to make of the outcomes. It is good to know that none of the patients broke the emergency medicine rule that all bleeding stops… eventually.

Bottom line: For patients peeing blood, you are free to make it up as you go.


It just might be safe to pee in the Amazon

Bauer IL. Candiru–a little fish with bad habits: need travel health professionals worry? A review. J Travel Med. 2013;20:(2)119-24. PMID: 23464720

This is one of those really weird medical myths that I heard when I was younger and just stuck with me as a true. Apparently if you urinate in the Amazon river, there are little fish, called Candiru, that are attracted to the urine and will swim up your urethra. Once there, they have small barbs that lock them into place. These authors did an extensive review of both the scientific and non-scientific literature and report that there has never actually been a confirmed case of this occurring. For some reason, that is an amazing relief to me (and I have never even been to South America). Was I the only one raised on this particular myth?

Bottom line: Feel free to pee in the Amazon, if that’s your thing.


Don’t write off those vital signs just yet

Rodrigo GJ, Neffen H. Assessment of acute asthma severity in the ED: are heart and respiratory rates relevant? The American journal of emergency medicine. 2015. PMID: 26233619

This is a retrospective look at data that was collected prospectively as part of 7 other asthma trials done at a single emergency department. In total, 1192 adult patients were included. They compared heart rate and respiratory rate between two predefined groups: severe asthma (defined as an FEV1 31-50% of expected) and life threatening asthma (defined as an FEV1 <= 30% expected). The HR and RR were not different between the groups (mean of 102 and 22 respectively). They then use logistic regression to show that only FEV1 and O2 saturation were related to the outcome of admission to hospital. Based on this, they conclude that HR and RR are not determinants of acute asthma severity. I think this is probably the wrong interpretation. They use FEV1 as their definition of illness severity rather than hard outcomes. The lack of correlation between FEV1 and vital signs in this study might equally indicate that FEV1 is not a good indicator of disease severity. (It is a disease oriented, not a patient oriented outcome.) Although FEV1 was correlated with admission rates at this hospital, I imagine this just represents the local practices of the hospital: they believe in FEV1 and therefore admit you to hospital if your FEV1 is low, even if you had no other indications for admission.

Bottom line: I would still strongly suggest assessing patients clinically, including vital signs. Don’t let surrogate outcomes like the FEV1 or peak flow rates confuse you in asthma.


Another quick note on measuring asthma severity

Huff JS and Diercks DB. Use of Peak Expiratory Flow Rate Monitoring for the Management of Asthma in Adults in the Emergency Department. Revision of: American College of Emergency Physicians. Use of Peak Expiratory Flow Rate Monitoring for the Management of Asthma in Adults in the Emergency Department. Ann Emerg Med. 2001;38:198.

Without going into all the problems with the base literature on the use of peak flow rates in emergency medicine, I thought I would include the ACEP policy statement for reference. This is an update of their previous policy statement from 2001, with 27 new studies identified and reviewed. Their summary: “The use of PEFR monitoring has not been shown to improve outcomes, reliably predict need for admissions, or limit morbidity or mortality when used during the ED management of adult patients with acute exacerbations of asthma.”

Bottom line: Peak flow is a disease oriented outcome. Focus on patient oriented outcomes.


Sepsis and the rush to early antibiotics

de Groot B, Ansems A, Gerling DH. The association between time to antibiotics and relevant clinical outcomes in emergency department patients with various stages of sepsis: a prospective multi-center study. Critical care. 2015;19:194. PMID: 25925412

This is a prospective, multicentre observational cohort study including a total of 1,168 adult patients with sepsis (although their definition was anyone admitted to hospital with an infection who received IV antibiotics.) The overall mortality of their cohort was 10%, so significantly lower than the trials of severe sepsis we are used to. In this cohort, the length of time it took to give antibiotics was not associated with mortality. Much like the prior studies that showed a higher mortality in patients with delays to antibiotics, we must be aware of the mantra: association is not causation. In the current study, the delay to antibiotics might have been because patients had less severe infections. On the other hand, in prior studies in which antibiotic delays were associated with increased mortality, we might guess that patients were misdiagnosed or inappropriately dispositioned, which could be the true cause of increased mortality. Why did this study come to a different conclusion? One possibility is simply the timing of the studies. It is impossible to practice emergency medicine these days without a keen awareness of sepsis. This heightened awareness may lead to over-treatment in general, such that the few patients that don’t get early antibiotics really don’t require them.

Bottom line: Once you know there is a bacterial infection, obviously give antibiotics. However, there are many factors that will affect the timing of antibiotic administration and it should not be used as a quality of care metric.


We should probably just install CT scanners at triage

Claessens YE, Debray MP, Tubach F, et al. Early Chest CT-Scan to Assist Diagnosis and Guide Treatment Decision for Suspected Community-Acquired Pneumonia. Am J Respir Crit Care Med. 2015. PMID: 26168322

I think this paper is a little ridiculous and I include it only so you can ignore anyone who talks about it (including me, if you would like.) These authors enrolled 319 adult patients with clinically suspected community acquired pneumonia and subjected them to both a chest xray and a CT scan. Not surprisingly, the CT scan found what were interpreted as infiltrates in 33% of patients who had normal chest xrays. The CT findings were used to change management, both in terms of use of antibiotics as well as decision to admit, in a reasonable number of patients. However, it is not clear if any of those management changes were actually warranted. The authors want to use this data to conclude that patients suspected of community acquired pneumonia should all get CT scans. That is absolutely nutty. If we were missing 33% of clinically important pneumonias with current practice, our morgues would be full. Either these are tiny infiltrates that we fight off ourselves (after all, the human species has survived millennia without antibiotics), they are false positives, or we catch the pneumonia on a follow up xray 2 days later with a substantially lower radiation burden. (As a side note, be prepared for a similar problem of overdiagnosis in the many studies I assume will soon be published about using ultrasound for pneumonia, even if it has the advantage of no radiation.)

Bottom line: Just say no to CT scans for pneumonia


Glue works for abrasions too

Singer AJ, Chale S, Taylor M. Evaluation of a liquid dressing for minor nonbleeding abrasions and class I and II skin tears in the emergency department. The Journal of emergency medicine. 48(2):178-85. 2015. PMID: 25456777

This is an open label observational trial with no comparison group,using a convenience sample of 40 patients and 50 total wounds. The wounds were either abrasions or skin tears. They used a cheaper skin adhesive that has not been tested for tensile strength (unlike dermabond). If tensile strength was required, a steristrip was applied before the glue. In follow up, there were no infections and only one patient needed anything else: his glue peeled off on day 3 and he had bandage applied. Of course, with no comparison group, all we can say is “Mikey likes it”.

Bottom line: Glue works in skin. Perhaps there is a role for stocking the cheaper liquid bandaid products sold at drug stores?


A simple, life-saving therapy I didn’t know about

Jamtgaard L, Manning SL, Cohn B. Does Albumin Infusion Reduce Renal Impairment and Mortality in Patients With Spontaneous Bacterial Peritonitis? Ann Emerg Med. 2015. PMID: 26234193

I always find it funny that I finished residency with a head full of practices, like PPIs for GI bleeds, that are demonstrably unhelpful, but at the same time there are potentially life saving treatments that I have never heard about. Albumin for spontaneous bacterial peritonitis is one of those treatments. These authors report a systematic review and meta-analysis of RCTs studying albumin for SBP. In total they found 4 studies that include 288 patients with limited heterogeneity and no evidence of publication bias. Only 1 trial was blinded, but with a hard outcome of mortality that might be less important. The administration of albumin (the 2 largest trials made sure to give it within 6 hours, so this might be an ED therapy) was associated with less renal impairment (OR 0.21 95%CI 0.11-0.42) and lower mortality (OR 0.34 95%CI 0.19-0.60). Dosing varied among studies, but the largest trial used 1.5grams/kg IV at the time of diagnosis and 1gram/kg on day 3.

Bottom line: These are small numbers, but I will be giving albumin to SBP patients until we see more.


Diverticulitis is not necessarily a reason to promote antibiotic resistance

Chabok A, Påhlman L, Hjern F, Haapaniemi S, Smedh K; AVOD Study Group. Randomized clinical trial of antibiotics in acute uncomplicated diverticulitis. Br J Surg. 2012 Apr;99(4):532-9. PMID: 22290281

I included the meta-analysis a few months back, but here is a multicentre RCT of 623 adult patients with CT confirmed uncomplicated diverticulitis (defined as lower abdo pain plus fever, an elevated WBC, and CT consistent with diverticulitis but no abscess or free air) randomized to either antibiotics or not. They used pretty big gun antibiotics: either a 2nd/3rd gen cephalosporin plus metronidazole or a carbapenem or piperacillin-tazobactam. There were no statistical differences between the groups. There were 3 perforations in each group. There were 3 abscesses in the no antibiotics group compared to none in the antibiotics group. 10 patients (3.2%) that started with no antibiotics were given antibiotics eventually. There were no differences in length of hospital stays or recurrent diverticulitis.

Bottom line: It may well be that we don’t need antibiotics for diverticulitis, but these patients were all treated as inpatients, so its probably not up to us to make that call.


Read enough and I might sound like an antibiotic nihilist

Matthys J, De Meyere M, van Driel ML, De Sutter A. Differences among international pharyngitis guidelines: not just academic. Annals of family medicine. 5(5):436-43. 2007. PMID: 17893386 [free full text]

I love this article, probably because it hits on two of my favorite soapbox topics: guidelines and antibiotics for sore throats. They searched for any major pharyngitis guidelines and found 10 from different countries and organizations. Two people individually coded each guidelines for all the major recommendations. The key finding of this paper is that despite all of these guidelines being “evidence based”, they arrive at wildly different recommendations. Several guidelines recommend prescribing antibiotics only if the patient is very sick or high-risk, but others suggest treating almost everyone. (If you want to find a guideline that tells you not to give antibiotics, look to Belgium, the Netherlands, England, or Scotland. Interestingly, these were the guidelines that were written by family doctors, as compared to specialists – I knew we had brains.) Not a single publication, including the Cochrane review, was cited by all the guidelines.

Bottom line: Unfortunately, guidelines are rarely an adequate source of evidence based clinical information. (Also, for most parts of the world, pharyngitis probably doesn’t need antibiotics.)


When is a clot a clot?

Morgan C, Choi H. BET 1: Do patients with a clinically suspected subsegmental pulmonary embolism need anticoagulation therapy? Emergency medicine journal : EMJ. 32(9):744-7. 2015. PMID: 26293150

What is the evidence for treating subsegmental pulmonary emboli? This review identified 2 observational trials that included patients with subsegmental PEs who were not anticoagulated. Of the total of 47 patients with untreated subsegmental PEs, none had recurrent venous thromboembolism at 3 months. It would not be surprising if the harms of anticoagulation outweighed the benefits, but 47 patients can’t give enough information to decide either way.

Bottom line: We still really don’t know what to do, but any treatment benefit is likely to be small.


Positive troponins are negative for patients

Hakemi EU, Alyousef T, Dang G, Hakmei J, Doukky R. The prognostic value of undetectable highly sensitive cardiac troponin I in patients with acute pulmonary embolism. Chest. 2015;147:(3)685-94. PMID: 25079900

This is a retrospective chart review of 298 patients with confirmed PEs looking at the prognostic value of a positive high sensitivity troponin. 45% of the group had a negative troponin and therefore 55% had a positive trop. If the troponin was negative, no patients died, needed CPR, or received lytics. Among those with a positive trop, 6% died and 9% had either CPR or lytics given. For a retrospective study, this one is more likely than usual to give us a correct answer as death, lytics, troponin, and to a lesser extent CPR are objective values that are likely to be accurately recorded on a chart.

Bottom line: It’s not surprising, but a positive troponin is likely a bad prognostic factor for PE patients.


Less relevant than the pee fish article?

Morgenstern J, Hegele RA, Nisker J. Simple genetics language as source of miscommunication between genetics researchers and potential research participants in informed consent documents. Public Underst Sci. 2015;24:(6)751-66. PMID: 24751688

This isn’t directly related to emergency medicine, but I was excited that after a few years of being “in press” the article based on my master’s thesis actually got published in print. This was a study that used qualitative methods to analyze the language of informed consent documents in genetics research. The main finding was that apparently simple, easy to understand language can be a source of miscommunication. This can occur because different people or groups of people will understand words differently. An example would be geneticists conceptualizing “disease” as an entity that may or may not cause actual symptoms in the future based on genetic predispositions, while their research participants may think of a “disease” as something they definitely have and will notice the effects of. Might this be applicable to emergency medicine? I think so, but without any good evidence. However, we know that when patients hear the words “congestive heart failure” they envision something that will kill within days – after all, their heart is failing – but this is not necessarily what we are trying to convey with those words. Similarly, we might talk about “low risk chest pain”, but different people might understand those words to indicate a 2% risk, or a 1 in a thousand risk, or a 1 in a million risk.

Bottom line: Communication is essential in emergency medicine. It is an area that probably deserves more attention.


Cheesy Joke of the Month

What is the difference between surgeons and God?

God doesn’t think he is a surgeon


FOAM resource of the month

A new site and podcast that I think will benefit all emergency physicians is:

https://www.phenomenaldocs.com/

Rather than being focused on clinical aspects of care, this site is run by Jason Brooks, a performance enhancement coach, with the goal of improving performance (both in the ED and in life in general) and making it sustainable. High level athletes have coaches, why shouldn’t we? I really enjoyed the first few podcasts.


Enjoy the free open access medical education? Think you know someone else who might? It would help me a lot if you spread the word and shared this resource with just one of your friends or colleagues. Even easier, you could also help by just clicking the like button on Facebook. Thank you so much!

Articles of the month (May 2015)

A monthly collection of the most interesting emergency medical literature I have encountered

Here are my favorite reads from this month. It is a little longer than usual, because apparently what I enjoy doing while sitting pool-side in paradise is catching up on the medical literature. I am sure there is room in the next iteration of the DSM for that.

 

Myth: Wound eversion magically eliminates scarring

Kappel S, Kleinerman R, King TH, et al. Does wound eversion improve cosmetic outcome?: Results of a randomized, split-scar, comparative trial. J Am Acad Dermatol. 2015;72:(4)668-73. PMID: 25619206

This is a prospective, randomized trial of post-op skin surgery patients where they closed half of the wound using wound eversion and the other half using basic planar approximation. The patients and 2 assessors were blinded and there was no significant difference in appearance at 3 or 6 months. This is in clean surgical wounds, so external validity to the ED is questionable. However, the authors looked for science supporting the dogma of wound eversion, and not surprisingly: there is none.

Bottom line: This is enough for me to stop dogmatically teaching wound eversion – though with only one study, I am always ready to change my mind.


“Therapeutic” hypothermia

Mark DG, Vinson DR, Hung YY, et al. Lack of improved outcomes with increased use of targeted temperature management following out-of-hospital cardiac arrest: a multicenter retrospective cohort study. Resuscitation. 2014;85:(11)1549-56. PMID: 25180922

A retrospective, before and after study of 1119 patients in a system where therapeutic hypothermia for out of hospital cardiac arrest was implemented in 2009. Despite the fact that you would expect improved outcomes just because of improved medical care over the half decade the study ran, there was no difference in mortality or neurologic outcomes whether or not you were cooled.

Bottom line: Thanks to TTM, we already know that cooling is not necessary. We should remember that fever avoidance is currently only a theory without significant evidence basis.


Kids don’t like being cold either

Moler FW, Silverstein FS, Holubkov R, et al. Therapeutic Hypothermia after Out-of-Hospital Cardiac Arrest in Children. N Engl J Med. 2015;372:(20)1898-1908. PMID: 25913022 

You probably would have been fine applying the TTM data to children, as they are just little adults, but we now have some pediatric specific data. This is a multicentre RCT of pediatric (2 days to 18 years) out of hospital cardiac arrest, comparing 33.0 with 36.8 degree Celsius targets. As you might expect, there was no difference in survival or functional outcomes up to one year. However, the raw numbers were better in the hypothermic children, despite being non-statistically significant.

Bottom line: There is no reason to put kids on ice outside of the context of further clinical trials.


Rate control in atrial fibrillation cage match: the cardiology approach (beta blockers) versus the emergency medicine approach (calcium channel blockers)

Martindale JL, et al. β-Blockers versus calcium channel blockers for acute rate control of atrial fibrillation with rapid ventricular response: a systematic review. Eur J Emerg Med. 2015;22:(3)150-4. PMID: 25564459

This is a systematic review of calcium channel blocker versus beta blockers for acute rate control of atrial fibrillation. They could only find 2 quality studies, which were very small. In these studies, diltiazem was better than metoprolol (RR 1.8 95% CI 1.2-2.6) for rate control.

Bottom line: The very limited evidence seems to fit with clinical experience: calcium channels blockers are more likely to get patients controlled in the ED.


The toughest question in the resus room? Maybe if a.fib is the cause of or the result of hemodynamic instability

Scheuermeyer FX, Pourvali R, Rowe BH, et al. Emergency Department Patients With Atrial Fibrillation or Flutter and an Acute Underlying Medical Illness May Not Benefit From Attempts to Control Rate or Rhythm. Ann Emerg Med. 2015;65:(5)511-522.e2. PMID: 25441768

This is a retrospective chart review (well done, but a chart review) of 416 patients with atrial fibrillation and an acute medical illness, out of British Columbia. They compared those patients who had their atrial fibrillation actively managed, versus those in whom the focus was only in treating the underlying condition. No one died in this study. Patients who had either rate or rhythm control had significantly increased rates of major adverse events, primarily increased requirement for pressors and increased intubations.

Bottom line: In sick medical patients who happen to have atrial fibrillation, focus on basic resuscitation over rate/rhythm control.


The new angioedema meds

Bas M et al. A randomized trial of icatibant in ACE-inhibitor-induced angioedema. New England Journal of Medicine. 2015;372(5):418-25. PMID: 25629740

This is one of a few new, very expensive treatments for hereditary angioedema. It is a selective bradykinin B2 receptor antagonist. This was a phase 2 RCT of 30 patients who either received Icatibant or standard therapy of steroids and anti-histamines for patients with ACE inhibitor induced angioedema. The icatibant group responded quicker (8 hours versus 27 hours) and had more complete resolution of their symptoms. The biggest concern with this study (aside from the tiny size and industry involvement) is that, although the standard therapy group probably represents usual care, ideal care might involve use of FFP instead.

Bottom line: In a very small study, icatibant seems to decrease angioedema a lot quicker than ‘usual care’.


Lots of Os up the nose

Frat JP, Thille AW, Mercat A, et al. High-Flow Oxygen through Nasal Cannula in Acute Hypoxemic Respiratory Failure. N Engl J Med. 2015. PMID: 25981908

This is a multi-centre randomized, open label study of high flow, humidified nasal oxygen, versus standard oxygen face mask, versus non-invasive positive pressure ventilation in adult, hypoxic patients. (CHF and exacerbations of asthma or chronic respiratory failure was excluded, so in other words this is primarily pneumonia patients.) There was no difference in their primary outcome of need for intubation, although they powered the study to detect a 20% difference, which is probably larger than the clinically important difference. This biggest news is that 90 day mortality was decreased in the high flow oxygen group (12%, versus 23% with standard oxygen and 28% in NIPPV), but this is a secondary outcome so should be interpreted with caution.

Bottom line: High flow nasal oxygen seems to be at least as good as NIPPV or facemask oxygen (in this select group of patients). This is enough for me to try this with alert pneumonia patients who don’t obviously need intubation.


More evidence PPIs aren’t completely safe

Antoniou T et al. Proton pump inhibitors and the risk of acute kidney injury in older patients: a population-based cohort study. CMAJ Open 2015;3(2):E166-71. (Free full text here)

Using the Ontario Drug Benefit database, these authors compared the cohort of patients with newly prescribed PPIs with a propensity matched group as a control. They excluded anyone also prescribed known nephrotoxic drugs, or with basically any other renal risk factors. People on PPIs were more likely to develop acute kidney injury, with a hazard ratio of 2.52 (95% CI 2.27-2.79). Out of 290,000 patients studied, 1787 were admitted to hospital with AKI – about 8 more than controls for every 1000 patient years on PPIs.

Bottom line: No medication is without side effects, but we treat some like they are water. Early studies will always emphasize benefits and downplay harms.


You don’t need fancy lenses and mirrors to see the retina

Vrablik ME et al. The diagnostic accuracy of bedside ocular ultrasonography for the diagnosis of retinal detachment: a systematic review and meta-analysis. Ann Emerg Med 2015; 65(2):199-203. PMID: 24680547

This meta-analysis attempted to determine the accuracy of ultrasound for diagnosis of retinal detachment in the hands of emergency physicians. In population with a prevalence of detachment between 15% and 38%, they found a sensitivity of ultrasound of 97-100% and a specificity of 83-100%. Of course, these studies are often done with experienced ultrasonographers or after specific training.

Bottom line: I think this definitely has a place in the ED.

Bonus: This castlefest lecture is a great resource for ocular ultrasound, with free CME


A little more diagnostic technology: iPhone otoscopes

Richards JR, Gaylor KA, Pilgrim AJ. Comparison of traditional otoscope to iPhone otoscope in the pediatric ED. Am J Emerg Med. 2015. PMID:  25979304

These authors compared a traditional otoscope with a new one that attaches to your iphone and gives you a video display. There was reasonable agreement between the new one and the old one, although residents and attendings still disagreed about the findings a lot. They claim that the iPhone scope changed the final diagnosis a number of times, but without a clear gold standard I wouldn’t focus on that result.

Bottom line: I am not sure how important it is to treat anything they found here, which limits the value of the tool – but this could be a great way to teach students otoscopy.


Can the D-Dimer be improved? (Well, it can’t get any worse, can it?)

Jaconelli Y and Crane S. Towards evidence based emergency medicine: best BETs from the Manchester Royal Infirmary. BET 2: Should we use an age adjusted D-dimer threshold in managing low risk patients with suspected pulmonary embolism? Emerg Med J 2015;32(4):335-7. PMID: 25804861

This is a systematic review (published before last month’s paper, and so not including it) that found 13 papers addressing the use of an age adjusted d-dimer (less than age x 10). Most of the studies were retrospective, so not of high quality. The authors conclusion is “In older patients suspected of having a PE, with a low pretest possibility, an age-adjusted D-dimer increases specificity with minimal change in the sensitivity, thereby increasing the number of patients who can be safely discharged without further investigations.”

Bottom line: It is looking like the age adjusted d-dimmer in low pre-test probability patients will result in a post-test probability below the test threshold, while increasing specificity.


Speaking of PE testing, the CTPA is not a perfect test

Miller WT, Marinari LA, Barbosa E, et al. Small Pulmonary Artery Defects Are Not Reliable Indicators of Pulmonary Embolism. Ann Am Thorac Soc. 2015. PMID: 25961445

In this study, they took all of the CT scans that were read as positive for PE in one radiology system, and had the scan review by 4 subspeciality thoracic radiologists. 15% of scans read as showing a subsegmental PE by community radiologists were thought to be false positives by the specialists. Another 27% were thought to be indeterminate. This only represents disagreement among radiologists and not the inherent false positives of the test itself.

Bottom line: A positive CT scan is not an objective finding. Before subjecting patients to lifelong anticoagulation, a second opinion on the read might be warranted.


PEs come from the legs – those IVC filters make sense, right?

Mismetti P, Laporte S, Pellerin O, et al. Effect of a retrievable inferior vena cava filter plus anticoagulation vs anticoagulation alone on risk of recurrent pulmonary embolism: a randomized clinical trial. JAMA. 2015;313:(16)1627-35. PMID: 25919526

Prosecptive RCT with blinded outcome assessors, but unblinded patients and treating physicians, randomized 399 patients with PE plus a DVT plus a marker of severity to either anticoagulation alone or anticoagulation plus a retrievable IVC filter. Recurrent PE occurred in 3% of the filter group (all fatal) and 1.5% of the no filter group (2 of 3 fatal) for a non statistically significant relative risk of 2.0 (95% CI 0.51 – 7.89).

Bottom line: IVC filter don’t decrease the rate of PE in patients than can be anticoagulated.


Medications don’t cure kidney stones

Pickard R et al. Medical expulsive therapy in adults with ureteric colic: a multicentre, randomised, placebo-controlled trial. Lancet. 2015. PMID: 25998582

Flomax was pushed for renal stones based on a number a small studies with horrible methods and a few meta-analyses of those horrible studies. There has already been one large RCT with excellent methods demonstrating that Flomax doesn’t work. This should be the nail in the coffin. This is a multicentre placebo controlled RCT of 1167 adult patients with CT confirmed renal stones. They were randomized to either tamsulosin 0.4mg, nifedipine 30mg, or placebo. There was no difference between any of the groups in the number of patients requiring urologic intervention. (About 80% of the patients passed spontaneously, and 20% required an intervention in all groups.)

Bottom line: There is no role for medical expulsive therapy in renal colic.


Antibiotics don’t work for diverticulitis? Is nothing sacred?

Shabanzadeh DM, Wille-Jørgensen P. Antibiotics for uncomplicated diverticulitis. Cochrane Database Syst Rev. 2012;11:CD009092. PMID: 23152268

This is a Cochrane systematic review that was able to identify 3 RCTs looking at the use of antibiotics for uncomplicated diverticulitis. Only one compared antibiotics to no antibiotics, the other two compared different types and courses of antibiotics. There was no difference in any of the regimens. In other words, no antibiotics was the same as antibiotics.

Bottom line: Not enough to change my practice, but it is good to know that we have minimal footing to our current practice.


Antibiotics in appendicitis? The right side of the bowel is different from the left, right?

Varadhan KK, Humes DJ, Neal KR, Lobo DN. Antibiotic therapy versus appendectomy for acute appendicitis: a meta-analysis. World J Surg. 2010;34:(2)199-209. PMID: 20041249

This meta-analysis concludes surgery may have a lower risk of complications than antibiotics (RR 0.43 95% CI 0.16-1.18). A little more than 30% of patients treated with antibiotics will actually require surgery. The authors seem to think biases in current study favour the antibiotics group, so real outcomes might be worse.

Bottom line: We don’t really get to make this decision anyway, but surgery is probably still the gold standard.


One last one on antibiotics: If you are going to treat with oral (which you probably should in most cases) don’t give a dose IV in the department

Haran JP, Hayward G, Skinner S, et al. Factors influencing the development of antibiotic associated diarrhea in ED patients discharged home: risk of administering IV antibiotics. Am J Emerg Med. 2014;32:(10)1195-9. PMID: 25149599

This is a prospective cohort study of 247 patients, all of whom were being treated with outpatient oral antibiotics. They compared those who received an IV dose in the ED to those who did not. 25.7% of the IV group developed antibiotic associated diarrhea versus 12.3% in the no IV group (a number needed to harm of 7.5).

Bottom line: Unnecessary IV antibiotics harm our patients.


The best drugs are probably those they keep away from us

Calver L, Page CB, Downes MA, et al. The Safety and Effectiveness of Droperidol for Sedation of Acute Behavioral Disturbance in the Emergency Department. Ann Emerg Med. 2015. PMID: 25890395

This is a prospective observational study of 1009 patients in Australia, all of whom received 10mg of droperidol for sedation of acute behavioral disturbances, and second dose at 15 min as needed. Out of those 1009 patients, 13 developed a long QT, and 7 of those had other contributing causes such as methdone or amiodarone. There were no incidences of tosades de pointes.

Bottom line: The black box warning against droperidol is likely without scientific merit. I would use it if it were available to me. Given how useful this medication is, it might be worth fighting for.


Let’s do two on poo

Gerding DN, Meyer T, Lee C, et al. Administration of spores of nontoxigenic Clostridium difficile strain M3 for prevention of recurrent C. difficile infection: a randomized clinical trial. JAMA. 2015;313:(17)1719-27. PMID: 25942722

We are all colonized with C.diff., so we should be experts in getting rid of it. This is a new one to me. They took patients who completed their treatment for C.diff. and infected them C.diff. Only, this strain of C.diff does not form toxins. This reduced recurrence of clinical infection from 30% to 11%.

Bottom line: You can treat Clostridium difficile with Clostridium difficile. Maybe we should infect ourselves prophylactically?

Drekonja D, Reich J, Gezahegn S, et al. Fecal Microbiota Transplantation for Clostridium difficile Infection: A Systematic Review. Ann Intern Med. 2015;162:(9)630-8. PMID: 25938992

A systematic review, but there are only 2 RCTs to include. In one RCT, fecal trasplant led to 81% of patients having symptom resolution, versus only 31% in the vancomycin group. In another, they demonstrated no difference between NG and rectal routes for the transplant, with about 70% resolution of symptoms. (I’d choose the rectal route, thanks.)

Bottom line: Still really not enough science to warrant a bottom line, but if C.Diff is turning your life to sh*t, consider someone else’s sh*t: it might make you feel better.


Apparently science is useless for xanthrochromia.

Chu K, Hann A, Greenslade J, Williams J, Brown A. Spectrophotometry or visual inspection to most reliably detect xanthochromia in subarachnoid hemorrhage: systematic review. Ann Emerg Med. 2014;64:(3)256-264.e5. PMID: 24635988

This is a systematic review of 10 studies comparing visual inspection to spectrophotometry for detection of xanthrochromia. Visual inspection: sensitivity 83.3% and specificity 95.7%. Spectrophotometry: sensitivity 86.5% and 85.8%. (The gold standard varied from angiography to clinical follow-up.)

Bottom line: There is no clear difference between the two, but neither seem great. Isn’t there some way for the lab to test for the chemical that makes the fluid yellow?


1 + 1 + 1 = 3?

Angus DC, Barnato AE, Bell D, et al. A systematic review and meta-analysis of early goal-directed therapy for septic shock: the ARISE, ProCESS and ProMISe Investigators. Intensive Care Med. 2015. PMID: 25952825

Surprise. The meta analysis of three trials that said the same thing, says the same thing: EGDT is not superior to usual care in 2015. What is worth mentioning is that this is a very good meta-analysis because the investigators of all three trials went out of their way to ensure they were using the same definitions and outcomes before starting.

Bottom line: We can be very confident that we don’t need to be following the protocols of the original EGDT study.


Game changer (x2) for neonatal resuscitation?

Gruber E, Oberhammer R, Balkenhol K, et al. Basic life support trained nurses ventilate more efficiently with laryngeal mask supreme than with facemask or laryngeal tube suction-disposable–a prospective, randomized clinical trial. Resuscitation. 2014;85:(4)499-502. PMID: 24440666

A prospective, RCT comparing ventilation with facemask vs the LMA supreme (LMA-S) vs the laryngeal tube suction-disposable (LTS-D) device in neonatal resuscitation. A lot of the outcomes were of questionable relevance, but ventilation failed in 34% of patients with facemask, 22% with the LTS-D, and 2% with the LMA-S. Higher tidal volumes were delivered with both the LTS-D and the LMA-S than the facemask (470ml vs 240ml). All these resuscitations were run by nurses, so external validity may be questionable.

Trevisanuto et al. Supreme Laryngeal Mask Airway versus Face Mask during Neonatal Resuscitation: A Randomized Controlled Trial. The Journal of Pediatrics. 2015. PMID: 26003882

This is another prospective randomized trial (neither of these could be blinded) of LMA-S versus facemask in 142 neonatal resuscitations of infants greater than 34 weeks or 1500 grams. The LMA resulted in higher 5 minute APGAR scores, less intubations, and lower admissions to NICU.

Overall bottom line: These two prospective studies paint a picture of better ventilation as well as improved patient important outcomes, such as intubations and NICU admissions, when an LMA is used over standard facemask ventilation for neonatal resuscitation. This might cause some culture shock when we run upstairs, but I think this is worth instituting.


Another myth: The subglottic area is the narrowest area of the pediatric airway

Dalal PG, Murray D, Messner AH, Feng A, McAllister J, Molter D. Pediatric laryngeal dimensions: an age-based analysis. Anesth Analg. 2009;108:(5)1475-9. PMID: 19372324

These authors measured the cross sectional area of the airways of 153 children (6months to 13 years) using video bronchoscopy under general anesthesia, and they found that it is the glottis not the cricoid that is the narrowest portion of the airway.

Bottom line: Probably shouldn’t change your daily practice, still pick a tube small enough to pass the cords, but just remember that a lot of what we “know” and teach is wrong. Always keep an open mind in medicine.


Cheesy Joke of the Month

As the doctor completed an examination of the patient, he said, “I can’t find a cause for your complaint. Frankly, I think it’s due to drinking.”

“In that case,” said the patient, “I’ll come back when you’re sober”


FOAMed Resource of the Month

Its not actually up an running yet, but I am really excited about the idea, so its more something to keep an eye out for. If anyone has played around with Coursera or EdX, you know there is a lot of incredible high quality education available for free in just about any subject. These are called MOOCs (massive open online courses). Well, there will soon be an equivalent for emergency medicine education, created for ALiEM: http://www.aliem.com/sneak-peak-aliemu/