If you come across a patient, you've done your assessment of their injuries, they're stable, but suffering from an injured arm or leg, you can easily make an improvised split to stabilize and protect the injured body part with stuff you're already carrying with you into the backcountry.
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Guide Micah Rush explains how to fashion an improvised splint out of ski poles, shovel handles, even a jacket, and what the basics are to ensuring your patient has a comfortable, secure splint for their injury to ensure as painless an extraction as possible.