Sure, you can hold c-spine and wait for the medics. But you wont have any free hands to do a pt assessment, splint, control bleeding, administer epi, or make a phone call.
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What exactly needs to be splinted in the next 5 minutes? When's the last time you gave epi (0.3 mg IM) on a patient that needed c-spine protection? What kind of an assessment do you expect is going to change this patient's life in the next 5 minutes? I'll give you the control bleeding, and perhaps even the make a phone call if you're really uncoordinated, but I'm pretty sure I can handle 911 with one hand. Heck, Siri can probably do it by herself.
Have you guys actually been on a scene? I mean, think about it. There is a large percentage that is going to be just fine for the next 5 minutes. There is a small percentage that is going to die no matter what you do. And there's a tiny percentage in which you doing something prior to medic arrival which will really make a big difference. We're talking about interventions that need to be done in the next 5 minutes that are going to save life or limb. Let's list them out:
1) Direct pressure on bleeding. (no equipment required.)
2) Open an airway with a jaw thrust (no equipment required.)
3) Some rescue breaths (no equipment required but if you're grossed out, well, I guess a BVM and an OPA is reasonable. A laryngoscope is not.)
4) Compressions (no equipment required.)
5) Epi-pen
6) AED
7) Oral glucose (well, that can probably wait 5 minutes)
8) A tourniquet
9) Needle a chest (14 g angiocath)
10) Remove from dangerous situation (no equipment required)
11) Spinal precautions (no equipment required)
Anything else? I'm sure there's a few I've missed. I also find it a little bizarre to see how much personal protective gear people like to throw into these things. How many of you have had patient blood all over you? That's what skin is for. Know anyone that's gotten Hep C or HIV from getting blood on their skin? Me neither. Even a needle stick has quite a low rate of transmission. If a guy's bleeding to death you're not going to put your hand over his wound? Bandaging? What- you don't wear clothes? Take your damn shirt off.
This crazy idea that you're going to be running some code on the side of the road is dumb. ACLS can wait for the medics.
So what's in this fancy kit? An AED, an epi-pen, some candy, a 14g angiocath, and maybe a BVM. You can slide all that into the AED bag pockets.
All that said, I carry a lot more than that with me into the wilderness on multi-day trips, but that isn't what we're discussing here.