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at the right or wrong time, in the cardiac cycle, it can disrupt your heart rhythm. basically make it so the hard cannot beat correctly. and cause cardiac arrest. the treatment for that is of course quick cpr, every minute to go without cpr puts you at risk. second, quick application of and -- to shock you and get your height back into a regular rhythm. if indeed, mr. hamlin did suffer crimo show cordes, it was thanks to the preparation of the nfl and the nfl players association, thanks to the quick response of all those trained medical professionals and emergency physicians at the game that his life would have been saved. doctor, the likelihood of that being the injury that you saw, is there any other possible explanation? >> well they're certainly, our but have to, agree this is pretty much developing into what we think is commercial cordes. this is a traumatic injury to

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