ACC/AHA Guidelines for Ambulatory Electrocardiography

Frequent premature ventricular contractions (PVCs) (eg, 10 per hour) and high-grade ventricular ectopy (eg, repetitive PVCs, multiform PVCs, ventricular tachycardia) after MI have been associated with a higher mortality rate among MI survivors 86,89-91,94-100. However, once patients have at least 6 PVCs per hour, the risk of an arrhythmic event does not increase with more frequent PVCs 101 ... ................
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