The Three Strikes And You’re Out Airway Rule
Rapid airway control is key in critically injured trauma patients. But too many times, I’ve seen trauma professionals take far too much time to establish one. Here’s a good rule of thumb to use in these situations.
After pre-oxygenating the patient, your first pro gets a crack at it. They generally have the most time available, often 3-5 minutes before sats begin to drop.
In the unlikely situation that they are not successful, strike 1. Stop trying and resume bagging the patient. At this point, someone (trauma surgeon, lead medic) must get the crich set out. Then the next most experienced intubator gets a shot.
If they are not successful, strike 2. Resume bagging and open the crich set.
The most experienced intubator now gets their chance, using any advanced technology available. No success even now? Strike 3, use the crich set!
Bottom line: We should never allow more than 3 airway attempts, and sometimes clinical conditions will dictate fewer tries. Examples that come to mind are severe brain injury patients (hypoxia is bad) and patients who do not recover from oxygen desaturation when they are bagged. Don’t lose track of time and the number of attempts!
Trauma Surgeons And PTSD??
A number of studies have documented post-traumatic stress disorder in our trauma patients, pre-hospital providers, and combat veterans. A new study now suggests that PTSD symptoms are present in 41% of trauma surgeons(!). Can it be true??
The study was carried out using an email questionnaire that was sent to all EAST and AAST members. Respondents were directed to an online questionnaire that polled them for basic demographics, as well as a series of questions using a well-established PTSD checklist scale, the PCL-C.
Here are the factoids:
- 1104 questionnaires were distributed, and 453 were complete enough for analysis (41%)
- Respondents tended to be younger (68% < 50 years old), male (76%) and white (80%)
- The majority worked in Level I (71%) urban (90%) academic centers (81%) with resident coverage (83%)
- 85% took at least 4 in-house calls each month, 27% had 2 weeks or less of vacation each year (!), and 81% believed that trauma surgery was more stressful than other surgical subspecialties
- 40% of respondents had PCL scores consistent with PTSD (!)
- The only independent predictor of having PTSD symptoms was managing 5 or more critical cases while on call
Bottom line: Hmm, be skeptical of this one. Yes, it does seem to show some possible issues with PTSD in a select group of trauma surgeons. However, I don’t believe this is easily generalized, and my personal contact with surgeons around the country does not really bear this out. The survey methodology, response rate, and the skewed demographics raise some serious questions about the quality of this data. And can self-reporting of PTSD symptoms from a group of trauma surgeons really be reliable?? It does appear that a subset of surgeons who work at very busy urban centers may be at risk, and this certainly deserves further scrutiny. But this study does not really apply to the majority of surgeons practicing trauma care in this country, who don’t work in that kind of environment.
Reference: Unveiling posttraumatic stress disorder in trauma surgeons: A national survey. J Trauma 77(1):148-154, 2014.
Acute Ethanol Intoxication And The Banana Bag
It’s one of those time honored treatments that most hospital-based providers are familiar with. The banana bag, reserved for intoxicated patients presenting to the ED or admitted to the hospital. They’ve been around so long, we just take them for granted. But like most things that have become dogmatic, they are due to be questioned from time to time.
A banana bag is a proprietary mix of “good” stuff, including electrolytes and vitamins, especially thiamine and magnesium. The exact content varies from hospital to hospital. Thiamine and other B vitamins give the resulting solution the characteristic color, hence the term “banana.”
Does it actually do good things like ward off Wernicke’s encephalopathy and megaloblastic anemia? A paper from Jacobi Medical Center in the Bronx prospectively evaluated a series of intoxicated people entering their ED. They drew vitamin B12, folate, and thiamine levels to see if they were deficient enough to even need vitamin supplementation.
Here are the factoids:
- These folks (only 77 patients) were very drunk! Average BAC was 280mg/dL.
- Vitamin B12 and folate levels were not critically low in any patient
- Thiamine was low in 15% of patients, but none had clinical evidence of a deficiency
- Later review of prior visits revealed that some patients with low levels had received a previous banana bag within 1 month. Did it do any good?
Bottom line: Most of our intoxicated patients are not vitamin deficient, and don’t need supplementation. The real kicker is that we almost never really try to find out if the patient might be a chronic abuser and potentially at risk. We just hang the bag. Remember, everything we do in medicine has a potential downside. And if the patient really doesn’t need a banana bag in the first place, there is no benefit to balance that risk. The next time you ask for that little yellow bag, think again!
Reference: Vitamin deficiencies in acutely intoxicated patients in the ED. Am J Emerg Med 26(7):729-795, 2008.
The Flat Vena Cava Sign? Published and Revisited
I’ve previously blogged about the flat vena cava sign as an indicator of low volume status in trauma patients. And I commented on this paper when it was presented at EAST, which had a surprisingly negative result. It’s now been vetted by peer reviewers and published, and I’ve had the opportunity to read through the entire manuscript (always important). So let’s take a second look now.
A retrospective study at George Washington University was carried out over a one year period. They looked at all of their highest level trauma activation patients who also underwent CT scan of the abdomen. Images were read by three radiologists and inter-rater reliability was reviewed. The transverse to anteroposterior diameter ratios were calculated to determine flatness.
Here are the factoids:
- 276 patients met enrollment criteria, and were mostly male and blunt trauma
- The IVC was nearly round in 21% of patients and collapsed in 26%
- There was no association between IVC shape and shock index, blood pressure, Hbg, lactate, urgent operation, angiography or length of stay
- There was also no association between IVC shape and blood transfusion or death
- Correlation of the reads between radiologists was good
So what gives? A paper I reviewed three years ago in the Journal of Trauma came to a different conclusion. They found that a flat IVC on CT scan (defined as a transverse to AP ratio of 4:1 or greater) was associated with a significantly higher chance of receiving more crystalloid or blood, as well as requiring an operation within 24 hours.
This newer paper was able to look at a larger group of patients, and they were able to tease out why it initially looked like the flat cava looked like a good predictor for bad things to come. The problem was statistical skewing from a few extreme outliers. When properly corrected, it completely changed things. And looking at the older study, it appears that outliers may have also been the reason for the positive result. This is why I encourage everyone to always read the entire paper! The older paper involved a smaller series (114 patients), but it was prospective and seemed to have reasonable statistical analyses.
Bottom line: It looks like the flat vena cava sign, as measured by a static CT, should be discarded as an indicator of impending shock. Whether or not a more dynamic look (using ultrasound) is valuable remains to be determined.
Reference: Inferior vena cava size is not associated with shock following injury. J Trauma 77(1):34-39, 2014.