Here is this month’s summary of my favorite reads from the medical literature.
Sick kids look sick
Vaillancourt S, Guttmann A, Li Q, Chan IY, Vermeulen MJ, Schull MJ. Repeated emergency department visits among children admitted with meningitis or septicemia: a population-based study. Ann Emerg Med. 2015;65:(6)625-632.e3. PMID: 25458981
This is a retrospective cohort of children 30 days to 5 years old who were hospitalized with the final diagnosis of either meningitis or septicemia. They were looking specifically at the children that had bounce backs. In total, 521 children were diagnosed with meningitis or septicemia, 114 (21.9%) of whom had been seen at a hospital in the 5 days prior to that diagnosis. The children all had similar mortality, lengths of stay, and critical care use whether you diagnosed them on the first visit or on the bounce back. Furthermore, meningitis and septicemia is very rare in pediatrics. There were a total of 511 cases in all of Ontario over the entire 5 years of this study. That is 511 out of 2,397,427 ED visits in this age group, or 0.02%, and you are only missing 20% of those on the first visit.
Bottom line: Emergency doctors are doing fine at diagnosing sick children. We don’t need fancy tests like CRPs or procalcitonins. Even if you miss the rare child, as long as you ensure good follow up, outcomes will be identical.
Green SM, Nigrovic LE, Krauss BS. Sick kids look sick. Ann Emerg Med. 2015;65:(6)633-5. PMID: 25536869
This is the excellent editorial that goes with the above paper. I just wanted to include a few quotes:
“A second explanation, simpler and more plausible, is that sepsis or meningitis was not present at the initial visit. The first diagnoses of nonserious viral or bacterial infections were not in error; however, after discharge these children had the rare misfortune of an unanticipated progression of illness.” Ie, don’t kick yourself too hard if you have a bounceback
“The study data of Vaillancourt et al suggest that, outside of the neonatal period, sepsis and meningitis are not occult conditions and that, accordingly, “sick kids look sick.” “
“The status quo is working.”
“These results encourage emergency physicians to trust the power and value of their clinical gestalt.”
Dead? Kick him in the chest
Trenkamp RH and Perez FJ. Heel compressions quadruple the number of Bystanders who can perform chest compressions for ten minutes. Am J Emerg Med. 2015. In Print. PMID: not yet available
This is an observational study in which a convenience sample of 49 individuals, who acted as their own controls, were asked to perform 10 minutes of chest compressions, first in the standard fashion, then using their heel. They describe this process as: the shoeless rescuer straddles the patient’s head facing the patient’s feet, with one foot next to the patient’s ear and the heel of the other foot placed on the chest at the standard CPR point. (A video of this maneuver is provided.) Defining adequate compressions as 100-120 two inch compressions per minute, overall 16% were able to maintain manual compression at 10 minutes and 65% were able to do 10 minutes of heel compressions. Performance of both got worse with age.
Bottom line: If you are a lone bystander who will have to perform prolonged CPR, you might want to consider using your foot.
But might a machine be better than a kick in the chest?
Perkins GD, Lall R, Quinn T, et al. Mechanical versus manual chest compression for out-of-hospital cardiac arrest (PARAMEDIC): a pragmatic, cluster randomised controlled trial. Lancet. 2015;385:(9972)947-55. PMID: 25467566
This is a prospective, randomized control trial of 4471 adult patients with out of hospital cardiac arrest, comparing mechanical CPR (the LUACS-2 device) to conventional CPR. There was no difference in return of circulation, or survival to hospital, at 30 days, at 90 days, or at 1 year. Personally, I find these results confusing. Although I am always biased to assume that new technologies are not going to be better than current practice (because they so rarely are), in this case we know that the one thing that matters for survival in cardiac arrest is consistent, good chest compressions. We also know that people tire and generally don’t provide great compressions, whereas the machine never tires. Based on that theory, the machine should clearly be better. Obviously we are missing something. Maybe it takes too long to get the machine on in the first place? Maybe no technology is capable of raising people from the dead?
Bottom line: There is no benefit to mechanical CPR, so don’t go blowing your budgets yet, but they are probably as good as manual CPR, so might be useful in certain specific scenarios (ongoing chest compressions during cardiac cath?)
Did everyone invest in CT scanners when I wasn’t looking?
Zonfrillo MR, Kim KH, Arbogast KB. Emergency Department Visits and Head Computed Tomography Utilization for Concussion Patients From 2006 to 2011. Acad Emerg Med. 2015. PMID: 26111921
This is a large database study looking at CT usage in concussion from 2006 to 2011 in the US. Overall, 0.5% of ED visits ended in a diagnosis of concussion. Although you might think we all know the CT head decision rules by now, the rate of CT in concussion increased by an absolute value of 11%. Conversely, the injury severity score decreased.
Bottom line: Although I though the CAEP choosing wisely choices were incredibly weak, because they should all already be part of basic good clinical practice, I will quote their first recommendation: Don’t order CT head scans in adults and children who have suffered minor head injuries (unless positive for a head injury clinical decision rule).
Should patients on warfarin should just have a daily head CT?
Nishijima DK, Offerman SR, Ballard DW, et al. Immediate and delayed traumatic intracranial hemorrhage in patients with head trauma and preinjury warfarin or clopidogrel use. Ann Emerg Med. 2012;59:(6)460-8.e1-7. PMID: 22626015
This is a prospective observational trial of 1064 adult patients with blunt head trauma on either warfarin (768 patients) or clopidogrel (296 patients) designed to look for delayed intracranial hemorrhage. These were patients with relatively minor trauma, mostly ground level falls, and 88% having a GCS of 15 at the time of examination. 7% had a bleed on the first scan (12% if on clopidogrel and 5% on warfarin). No patients on clopidogrel and 4/687 (0.6% 95%CI 0.2-1.5%) of patients on warfarin had a delayed intracranial hemorrhage. The major limitation of this study is that not everyone had CT scans.
Bottom line: The rate of delayed intracranial hemorrhage after a normal CT is low. It almost certainly doesn’t warrant routine repeat scans or admissions, but good patient instructions and follow up are reasonable.
Diltiazem over metoprolol for atrial fibrillation. Surprised?
Fromm C, Suau SJ, Cohen V, et al. Diltiazem vs. Metoprolol in the Management of Atrial Fibrillation or Flutter with Rapid Ventricular Rate in the Emergency Department. J Emerg Med. 2015. PMID: 25913166
This is a randomized, double-blind study comparing metoprolol (0.15mg/kg) and diltiazem (0.25mg/kg) in 106 adult patients with atrial fibrillation. The primary outcome of HR<100 at 30 minutes was achieved in 95.8% of the diltiazem group and 46.4% of the metoprolol group (p<0.0001). Diltiazem was better at all time points measured. There was no difference between in groups in term of adverse outcomes (hypotension or bradycardia).
Bottom line: Another small trial illustrating that calcium channel blockers are probably more effective than beta-blockers at controlling atrial fibrillation in the ED.
This doesn’t change anything: Asymptomatic hypertension still shouldn’t be treated in the ED
Levy PD, Mahn JJ, Miller J, et al. Blood pressure treatment and outcomes in hypertensive patients without acute target organ damage: a retrospective cohort. Am J Emerg Med. 2015. PMID: 26087706
A retrospective cohort of 1016 adult patients with a blood pressure greater than 180/110 and no signs or symptoms of acute organ damage. About 43% were given some kind of treatment, and there was no difference in ED revisits or mortality whether you were treated or not. Of course, this type of association doesn’t prove anything – maybe there was a reason some people were treated and others weren’t.
Bottom line: We still shouldn’t be treating (or working up) asymptomatic hypertension in the ED.
On that note, I might as well include the ACEP clinical policy:
Wolf SJ, Lo B, Shih RD, et al. American College of Emergency Physicians Clinical Policies Committee. Clinical policy: critical issues in the evaluation and management of adult patients in the emergency department with asymptomatic elevated blood pressure. Ann Emerg Med. 2013 Jul;62(1):59-68. PMID: 23842053
A few points from this policy (the policy contains only level C recommendations):
1) In ED patients with asymptomatic markedly elevated blood pressure, routine screening for acute target organ injury (eg, serum creatinine, urinalysis, ECG) is not required.
2) In patients with asymptomatic markedly elevated blood pressure, routine ED medical intervention is not required
Bottom line: (Cut and paste from above). We still shouldn’t be treating (or working up) asymptomatic hypertension in the ED.
We no communicate so good
Newman DH, Ackerman B, Kraushar ML, et al. Quantifying Patient-Physician Communication and Perceptions of Risk During Admissions for Possible Acute Coronary Syndromes. Ann Emerg Med. 2015;66:(1)13-18.e1. PMID: 25748480
This is a great paper by David Newman. They did paired surveys of patients being admitted to rule out ACS and their treating physicians to determine if patients and their physicians were on the same page with regards to the risk of MI (the reason the patient was being admitted). After having a conversation about admission, the patient and physician estimates of risk were only within 10% of each other 36% of the time. When asked about the chance of dying if an MI occurred at home, patients estimated the mortality at 80% compared to physicians estimates at 10%.
Bottom line: We do a poor job communicating to patients why we want to admit them to hospital. Without an understanding of their risk, patients cannot possibly make informed decisions that account for their own values and personal risk tolerance.
If you aren’t using bedside ultrasound, you probably also won’t be able to find this post on the internet, but congratulations on your upcoming retirement…
Stein JC, Wang R, Adler N, et al. Emergency physician ultrasonography for evaluating patients at risk for ectopic pregnancy: a meta-analysis. Ann Emerg Med. 2010;56:(6)674-83. PMID: 20828874
This is a systematic review and meta-analysis that includes 10 studies of 2057 patients looking at the accuracy of emergency physician performed ultrasound for ectopic pregnancy. The sensitivity (patients with an ectopic who had no IUP on ultrasound) was 99.3%, with a negative predictive value of 99.9% in this population with a 7.5% incidence of ectopic pregnancy.
Bottom line: Bedside ultrasound is excellent for ruling out ectopic.
Whats the best way to keep a cast dry?
McDowell M, Nguyen S, Schlechter J. A Comparison of Various Contemporary Methods to Prevent a Wet Cast. J Bone Joint Surg Am. 2014;96:(12)e99. PMID: 24951750
This non blinded trial compared six methods of keeping casts dry. There were 2 commercial products, compared to a plastic bag with duct tape, double plastic bags with duct tape, a plastic bag with a rubber band, or glad cling wrap. The weighed the cast after submerging in water for 2 minutes (so more intense than a shower) to determine water absorption. Plastic wrap and a single bag with duct tape were the least effective. A double bag with duct tape was 100% effective, as were the commercial products.
Bottom line: Of easily available methods, double plastic bags and duct tape are probably the best for showering with a cast.
Everything you could ever want to know about anal fissures
Nelson RL, Thomas K, Morgan J, Jones A. Non surgical therapy for anal fissure. Cochrane Database Syst Rev. 2012;2:CD003431. PMID: 22336789
This cochrane systematic review of the medical management of anal fissures covers 75 trials and 5031 patients of different medical therapies. Topical nitroglycerin increased early cure rates from about 35% to 49% compared to placebo, an NNT of 7, but about half of patients had late relapses. No conclusions can be made about calcium channel blockers or botox, because all studies were severely under-powered. Surgical therapy (which I have never referred for) was significantly better than any medical therapy, but does have a small risk of incontinence.
Bottom line: There is poor evidence for any medical therapy. In patients with chronic problems, surgical therapy should be considered.
Your kid rolled in poison ivy – what do you do?
Stibich AS, Yagan M, Sharma V, Herndon B, Montgomery C. Cost-effective post-exposure prevention of poison ivy dermatitis. Int J Dermatol. 2000;39:(7)515-8. PMID: 10940115
I didn’t know that you could prophylactically treat poison ivy after coming into contact with the plant, but before developing a rash. 20 healthy “volunteer” medical students were used them as their own controls. They exposed the students to poison ivy at 4 different spots. 2 hours later, the applied 0.5ml of either dial dish soap, Tecnu (a commercial product designed to chemically inactivate poison ivy), or Goop (a commercial cleaning product), and then rinsed the skin. They left the 4th area untouched as a control (but for some reason didn’t even rinse it off – just left it covered.) All three products were similar, but seem to decrease severity of the rash as compared to control. Ii was unclear if the study was blinded in any way.
Bottom line: If you touch poison ivy, it may be worth putting dish soap on the area and then cleaning thoroughly.
Lidocaine for limb pain – no, not a nerve block
Vahidi E, Shakoor D, Aghaie Meybodi M, Saeedi M. Comparison of intravenous lidocaine versus morphine in alleviating pain in patients with critical limb ischaemia. Emerg Med J. 2015;32:(7)516-9. PMID: 25147364
Like low dose ketamine, although to a lesser extent, I have heard a lot about using IV lidocaine for pain control this past year. This is a small RCT of 40 patients with ischemic limbs comparing IV morphine (0.1mg/kg) and IV lidocaine (2mg/kg). In patients with pain starting at 7.5/10, pain in the lidocaine group was better at 15 minutes (5.75/10 vs 7/10) and 30 minutes (4.25/10 versus 6.5/10), although those numbers may not be clinically significant.
Bottom line: Intravenous lidocaine may be an option for pain, but I am not sure when or why I would use it.
There is no such thing is a free lunch
Solomon RC. Coffers brimming, ethically bankrupt. Ann Emerg Med. 2012;59:(2)101-2. PMID: 22078890
An older editorial, but worth a read. The summary is that although we make a lot of excuses for why we take money from drug companies, none are any good. As individuals and as a group, we must just stop.
Bottom line: I will say it again. There is no such thing as a free lunch.
Patient with a PE – do you admit, send them home, or get them to the gym?
Lakoski SG, Savage PD, Berkman AM, et al. The safety and efficacy of early-initiation exercise training after acute venous thromboembolism: a randomized clinical trial. J Thromb Haemost. 2015;13:(7)1238-44. PMID: 25912176
A very small randomized, controlled trial that included 19 patients with PE, 9 of whom were randomized to a 3 month program including exercise and weight loss. They commit a cardinal sin by claiming to have multiple primary outcomes, but it looks like the exercise group lost weight and was more fit as compared to the usual care group. Of course, a grain or two of salt is required, but it looks like an interesting area for future research.
Bottom line: In the future, we may seen an equivalent to cardiac rehab for our PE patients. For now, I recommend all my patients exercise.
Completely irrelevant to medicine, but maybe the most useful information of the month: flight delays
When to fly to get there on time? Six million flights analyzed. Decision Science News. 2015.
This is a database study that looked at all the flight data in the United States for the year of 2013 to determine when you are most likely to be delayed. Not surprisingly, the later your flight is in the day, the longer a delay you can expect, until about 10pm, when the delays start to fall again. There are some graphs you can look at.
Bottom line: For the next conference you book (like say SMACC in Dublin next year), try to book your flight early in the morning if you don’t want to be delayed.
Cheesy Joke of the Month
Why can’t you tell when a pterodactyl is going to the bathroom?
Because their P is silent
FOAMed of the month
The world of critical care and open access medical education suffered an incredible loss this month with the passing of Dr. John Hinds. He was one of the most inspirational individuals I have encountered in my life, and although I only shook his hand a single time, his words have forever changed me.
It is hard to pick just one of this many incredible talks, but I know both my wife and I were blown away by his keynote speech at the SMACC conference in Chicago: “Crack the chest and get crucified”:
Justin Morgenstern. Articles of the month (July 2015), First10EM, 2015. Available at: