Every moment of every day, your heart thumps along reassuringly. It's one of the most rhythms of life. For nearly a century, doctors have used the spiky tracings of an electrocardiogram to look for signs of disease. Heart specialists have become expert at spotting abnormal patterns in an ECG and linking them to particular heart conditions. Yet there's a,lot more to these commonplace recordings than even the trained eye of a cardiologist can see.
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