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Heart Rate Variability HRV
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There are 3 ways to collapse .Fainting, Hypotension, and Atrial. 20,000 deaths through collapse is reason for action. The understanding of Heart Rate Variabilty is new science. However 4 years of data on the I phone and the correlation to collapse is undenible. HRV is a 1 second observation on your I phone. Don't look and get admitted to hospital