Tag Archives: heart beat

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Pacing device makes split-second difference A few hundredths of a second. The blink of an eye.Carol Penn couldn’t feel the split-second difference in the contractions of her heart’s two lower chambers, but an electrocardiogram detected it. The uncoordinated pumping stressed her heart, beat after beat, more than 100,000 times a day. Sewing ABCs with Student [...]

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