Amiodarone, Lidocaine, or Placebo in Out-of-Hospital Cardiac Arrest

The trial was just published today in the NEJM and authored by the Resuscitation Outcomes Consortium Investigators (including our own chair Dr. Ornato).

In short there was no difference in survival or neurologically intact outcome between amiodarone, lidocaine, and placebo for refractory ventricular fibrillation or pulseless ventricular tachycardia.

However, this may not argue against antiarrhythmics in cardiac arrest as there was no increase in adverse events in the experimental groups either and there was an increase in ROSC in the antiarrhythmic groups.

Another look at Sepsis 3

There’s been quite an explosion of discussion on the new sepsis guidelines in the FOAM world.

I had just assumed that ACEP was one of the 31 societies that endorsed the new guidelines, but notably absent are any US emergency medicine societies (the European Society of Emergency medicine did endorse them). I think it’s easy to see why ACEP passed on this as the new guidelines do not add much to change our recognition, definition, or treatment of sepsis in the emergency department.

One of the main assertions of the new guidelines is: “The current use of 2 or more SIRS criteria to identify sepsis was unanimously considered by the task force to be unhelpful.”

We all recognize that the specificity of SIRS was lacking. While our patients with pharyngitis, pyelonephritis, and influenza often meet sepsis criteria using SIRS they rarely fit into our usual concept of sepsis. Worse yet is every anxious psych or trauma patient being flagged as having SIRS criteria.

However the authors provide no replacement for SIRS other than the very questionably useful qSOFA score (Altered mental status, hypotension, and tachypnea). If we haven’t considered sepsis in an obtunded patient in shock then a qSOFA score probably won’t help.

The new sepsis definitions essentially eliminate the old category of plain ‘sepsis.’ Instead, the new definitions don’t really start until we reach what we formerly called severe sepsis: sepsis + end organ dysfunction.

Old Definition New Definition
Sepsis SIRS + Infection
Severe Sepsis Sepsis + end organ dysfunction Sepsis Infection + SOFA ≥ 2
Septic Shock Sepsis + hypotension Septic Shock Sepsis + vasopressors AND lactate ≥ 2

Anecdotally, I don’t think the challenge with sepsis in the ED is identifying the very sick, it’s trying to identify which patients might become sick that we could otherwise miss. These new definitions just push sepsis farther down the pathological spiral of infection rather than contributing anything to pre-hospital or ED diagnosis and management.

Maybe the SOFA score could help us pick up on some end-organ dysfunction we weren’t paying close attention to before, but by the time an ED patient has all the parameters necessary to calculate a SOFA score including CBC, BMP, LFTs, and an ABG they are well on their way into their sepsis workup and have already bought themselves an admission.

I won’t be throwing SIRS out the window in my practice and I don’t see qSOFA or SOFA having much impact on the majority of patients I see in the ED.

We’ll hear more on sepsis and the new guidelines from Dr. Mayglothling during the ID block in April. Until then here are several posts on the guidelines to keep you entertained:

PulmCrit/EMCrit – Top 10 problems with new sepsis definition
First10EM – Sepsis 3.0
First10EM – Is SIRS really that bad?
REBEL EM – Sepsis 3
St. Emlyn’s – Sepsis 3
Latin American Sepsis Institute – Why we did not endorse the new definition of sepsis

New Sepsis/Septic Shock Definitions

JAMA just published new guidelines defining sepsis and septic shock from a task force from the Society of Critical Care Medicine and the European Society of Intensive Care Medicine.

In short, our old SIRS criteria are replaced by the new definitions:

  • Sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection.
  • Organ dysfunction can be identified as an acute change in total SOFA score ≥2 points consequent to the infection.
  • A “quickSOFA” score can be used in pre-hospital, ED, or inpatient setting to identify these patients if they have at least 2 of the following: respiratory rate equal or greater than 22/min, altered mental status, or SBP < 100 mmHg.
  • Septic shock is defined as sepsis plus hypotension requiring vasopressors to maintain MAP ≥65 mm Hg and lactate level >2 mmol/L despite adequate volume resuscitation.

The full SOFA score is more complex and requires multiple lab values.

 

Apneic Oxygenation for Avoiding Hypoxemia in ED Intubations

By now we’re all pretty used to employing apneic oxygenation for RSI in the ED. However, most of the data comes from the OR and elective setting or is retrospective.

A recent randomized trial of apneic oxygenation in ICU patients actually failed to show benefit, though this population may have already been maximally preoxygenated and too sick to benefit from apneic oxygenation.

Sackles et al just published the results of their prospective data collection on apneic oxygenation in ED intubations by EM residents in Academic Emergency Medicine.

They found a 13.1% increase (CI 6.2% to 19.9%, OR 2.2 CI 1.5 to 3.3) in first pass success without hypoxemia when apneic oxygenation was used.

Other factors associated with first pass success without hypoxemia were a normal baseline SpO2 (OR 4.8, CI 2.2 to 10.3), used of video laryngoscopy (OR 2.7, CI 1.6 to 4.6), and intubation performed by a senior resident (OR 2.1, CI 1.1 to 3.7).

There are certainly many limitations to this study as it was prospective, non-randomized, and self-reported by the residents. Apneic oxygenation was not required but was its use was encouraged in every intubation. It may be that those who chose to use it were more likely to be successful in the first place.

In any case, apneic oxygenation was independently associated with an increased chance of first pass success without hypoxemia. This study bolsters the evidence for this fast, cheap, easy, low-risk, high-reward intervention for emergency department airway management.

How many intubations do I need to be successful?

Buis et al recently published an article in Resuscitation reviewing studies that evaluated intubation success in trainees.

To achieve a 90% success rate with no more than two attempts, most learners needed to have performed at least 50 prior intubations. While this seems like an easily achievable number to get in residency, these studies were all done in the OR in an elective setting. Certainly more practice would be required for the many difficult airways we encounter in the ED.

This is more evidence that we should take every opportunity to continue to hone our airway skills and get as many repetitions as possible.