Is the 8 gauge needle to decompress your own chest or someone else's?

I'm trying to imagine punching a needle into my own thoracic cavity...

Are you a working EMT? I am, and I can't decompress anyone's chest with a needle, not if I want to keep working anyway.

John E
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JohnE

"and all the lousy little poets
comin round
tryin' to sound like Charlie Manson"

The Future/Leonard Cohen