Bills safety Damar Hamlin collapses on field, AED and CPR used, cannot breathe, game paused

[Penn_Quaker_Girl]

Absolutely horrific, especially for someone so young.  My most heartfelt thoughts with him and his family.  

From my limited knowledge about sports medicine and the circumstances, may be a case of something called commotio cordis.  It's something I've read about in baseball and lax players where a sudden and violent hit to the chest during a very specific part of the cardiac cycle throws the heart into v-fib (irregular heart rhythm).  

It's extremely rare, the window for it to happen during the one-second cardiac cycle is incredibly tiny -- think of it like trying to throw a dart at a dot on a target that's zooming by.  

Again that's just me being an armchair physician, I obviously don't know anything about his medical history.  And regardless of the cause, this is absolutely awful.