Crush Injury Syndrome

What Is Crush Injury Syndrome?

Crush Injury Syndrome is the systemic reaction that occurs after prolonged compression (generally accepted as an hour or longer, though shorter compression on a large muscle mass can trigger it too) is released, when accumulated myoglobin, potassium, and other byproducts of muscle breakdown flood into circulation all at once. The critical window is the moment of extrication, not the time under compression: while the limb is still pinned, the toxic byproducts stay relatively localized, but the instant compression is released and circulation resumes, hyperkalemia and myoglobin can hit the heart and kidneys simultaneously, causing cardiac arrhythmia (sometimes cardiac arrest) within minutes and acute kidney injury over the following hours to days. This is why crush syndrome protocols call for aggressive IV fluid resuscitation started before extrication is completed, not after, along with cardiac monitoring in place before the crushing force is lifted.

Why Crush Injury Syndrome Matters on the Fireground

A patient who's talking and stable while still pinned can go into cardiac arrest within minutes of the crushing weight being lifted if IV access and fluids weren't established beforehand, which is why crush syndrome protocols require starting treatment before extrication finishes, not scrambling to start it after. Recognizing that the danger point is release, not the compression itself, is the single most important thing to get right in the field.

Relevant NFPA Standards

• NFPA 455: Standard for Emergency Medical Services (EMS)
• NREMT Standards: National Registry of Emergency Medical Technicians Practice Standards

Field Procedures & Tactical Steps

1. Identify entrapment duration and the muscle mass involved to anticipate crush syndrome risk before extrication begins.
2. Establish IV access and initiate fluid resuscitation per protocol while the patient is still entrapped, prior to release.
3. Attach cardiac monitoring before the crushing force is lifted to catch arrhythmia at the moment of release.
4. Coordinate the timing of extrication with medical personnel so treatment is already running when compression ends, not started afterward.

Common Context & Application

Anticipated during any extended extrication involving entrapment of a large muscle mass (limb, pelvis, torso) for a prolonged period, factored into the operational plan alongside the physical extrication itself.

Frequently Asked Questions about Crush Injury Syndrome