Bills announce Damar Hamlin showing 'remarkable improvement,' appears to be 'neurologically intact'

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16. Doctors believe his heart was healthy; it stopped because of commotio cordis.

Buffalo Bills' Damar Hamlin's heart was most likely healthy before collapse

The right hit at the wrong time may have triggered a rare phenomenon known as commotio cordis, heart experts suggest.

https://www.nbcnews.com/health/health-news/cardiac-arrest-causes-buffalo-bills-damar-hamlin-rcna64020

As the above article points out, NFL players undergo extensive physicals each year, and heart checks. Even my kid who plays college soccer had to undergo a physical by the team doctor who checked his heart.

If Damar Hamlin had that impact to his chest from Tee Higgins' helmet just a few milliseconds before or after that particularly vulnerable point in the heart's electrical cycle, he would have been fine. This doctor explains it well:

And yes, because his heart did stop, there is a huge worry about brain (and other organs) damage. So far, he is looking pretty good...