I had a great question sent in by a reader last week:
Some trauma centers receive a number of transfers from referring hospitals. Much of the time, a portion of the workup has already been done by that hospital. If the patient meets one or more of your trauma activation criteria, do you still need to activate your team when they arrive?
And the answer is: sometimes. But probably not that often.
Think about it. The reason you should be activating your team is that you suspect the patient may have an injury that demands rapid diagnosis and treatment. The purpose of any trauma activation is speed. Rapid evaluation. Fast lab results. Quick access to CT scan or OR. If a significant amount of time has already passed (transported to an outside hospital, worked up for an hour or two, then transported to you), then it is less likely that a trauma activation will benefit the patient.
There are four classes of trauma activation criteria. I’ll touch on each one and the need to activate in a delayed fashion if present, in priority order.
- Physiologic. If there is a significant disturbance in vital signs while in transit to you (hypotension, tachycardia, respiratory problems, coma), then you must activate. Something else is going on that needs to be corrected as soon as the patient arrives. And remember the two mandatory ACS criteria that fall into this category: respiratory compromise/need for an emergent airway, and patients receiving blood to maintain vital signs. But a patient who needed an airway who is already intubated and no longer compromised does not need to be a trauma activation.
- Anatomic. Most simple anatomic criteria (e.g. long bone or pelvic fractures) do not need a trauma activation unless the patient is beginning to show signs of physiologic compromise. However, anatomic criteria that require rapid treatment or access to the OR (proximal amputations, mangled or pulseless extremities, spinal cord injury) should be activated.
- Mechanism. Most of the vague mechanistic criteria (falls, pedestrian struck, vehicle intrusion) do not require trauma activation after transfer to you. But once again, if the mechanism suggests a need for further rapid diagnosis or treatment (penetrating injury to abdomen), then activate.
- Comorbidities. This includes underlying diseases, extremes of age, and pregnancy. In general, these will not require trauma activation after they arrive.
Bottom line: In many cases, the patient transferred in from another hospital will not need to be a trauma activation, especially if they have been reasonably assessed there. The patient should be rapidly eyeballed by your emergency physicians, and if there is any doubt about their condition, activate then.
However, if little workup was done at the outside hospital (my preference), and the injuries are “fresh” (less than a few hours old), then definitely call your team.
Every Fourth of July, someone just has to try an “off label” use for fireworks.
Don’t try this at home. Even “trained professionals” would never do anything like this.
EMS providers are the trauma professional’s eyes and ears when providing transportation from the scene of an accident. We rely on their assessment of the mechanism of injury and the amount of blood lost. We tend to believe in the accuracy of those assessments.
A study was carried out that tested EMS personnel on their ability to accurately estimate specific amounts of blood that were left at a simulated accident scene. The blood volumes tested were 500cc, 1000cc, 1500cc and 2100cc. A total of 92 professionals participated, and there was an even split into basic EMTs (34%), intermediate/critical care EMTs (33%) and paramedics (31%). Experience levels were as follows: 0-5 years 43%, 6-10 years 30%, >10 years 31%.
The results were as follows:
- 87% underestimated the quantity of blood
- 9% overestimated
- 4% guessed the exact amount
- Experience or credentialing level did not matter
Only 8% of the subjects were within 20% of the actual volume, and an additional 19% were within 50%. In general, most medics underestimated the amount of blood lost, and their guesses were worse with higher volumes. The median guess for the 2100cc loss group was only 700cc!
Bottom line: Visual estimates of blood loss are extremely inaccurate, and are most likely underestimates. Physicians in the ED should rely on exam and physiology to help determine the amount of blood loss. For safe measure, multiply the reported blood loss of the EMT or paramedic by 2 or 3 to get a realistic number.
Reference: Patton et al. Accuracy of Estimation of External Blood Loss by EMS Personnel. J Trauma 50(5), 914, 2001.
I received some good guesses about this image yesterday, but no one got the right answer.
The patient had sustained blunt trauma and was undergoing CT imaging. The scout for the abdominal CT showed some kind of weird debris that interfered with the image, but when we uncovered and looked at the patient, nothing was visible:
What the heck? If you look carefully at the left side of the image, you can see that the “debris field” is on the surface of the patient. We can’t see in 3-D on images, but the difference in appearance on the left and right sides looks like it this stuff is wrapping around the patient.
She was brought in by EMS with a warming blanket in place. On closer inspection, this was a thin, disposable blanket that heats up when removed from an airtight plastic pouch. These blankets contain thin pockets of a mineral mixture that looks like gravel. When exposed to air it heats up.
But on CT it looks like bone density material! When we looked at the patient, we were just lifting off the blanket that contained the offending material. Hence, we couldn’t find it.
Here’s a picture of one of these products. Note the six mineral pouches embedded in it., Don’t let this happen to you!
Here’s one for you. A patient is brought to you after a motor vehicle crash. You’ve completed your evaluation in the trauma resuscitation room, and you move off to CT for some imaging.
As the techs are preparing to do the abdominal CT, they perform the scout image to set up the study. This is what you see:
The arm was left down due to a fracture (note the splint along the forearm). But what is all that debris on the image? Other than a few abrasions here and there, nothing is visible on the skin in those areas.
What the heck? What do you think these are? Will they interfere with imaging? And what can you do about it?
Tweet or comment with your answers. I will explain all tomorrow.