Common heart abnormality linked to risks

Researchers connect the condition, called an increased PR interval, to a substantially higher risk of erratic heartbeats and need for a pacemaker, as well as risk of death. A common abnormality of electrocardiograms that has long been thought to be inconsequential is actually associated with a substantially increased risk of erratic heartbeats or a need for a pacemaker -- and with a modestly...

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