Doctor explains what may have caused Damar Hamlin's collapse
What happened to Damar Hamlin shocked NFL players. But it's not unheard of in sports, especially baseball. Good Day talked to Dr. Sumeet Chhabra, a cardiologist with Texas Health Presbyterian Hospital in Plano. He explained what likely caused Hamlin's cardiac arrest.
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Doctor explains what may have caused Damar Hamlin's collapse
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