NFL star Damar Hamlin is still in critical condition in hospital and is yet to regain consciousness after his on-field cardiac arrest left the nation in shock.
Doctors believe the 24-year-old suffered a freak injury where the heart struck at a precise angle and time in the pumping process that prevents it from getting blood around the body.
They say he has already cleared the first major hurdle — surviving. Only 3 percent of sufferers survive if CPR is not administered within three minutes of the injury.
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