BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Extrasystole heartbeats, ECG artwork. Diagram showing the electrical activity of the atrium (top) and ventricle (bottom) of a human heart during extrasystole. Premature ventricular contraction (PVC), or extrasystole, is a relatively common event where the heartbeat is initiated by Purkinje fibres in the ventricles rather than by the sinoatrial node, the normal heartbeat initiator.
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