BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Atrial extrasystole. Anatomical computer artwork of a transverse section through a human heart during atrial contraction in extrasystole. Premature ventricular contraction (PVC), or extrasystole, is a relatively common event where the heartbeat is initiated by Purkinje fibres in the ventricles (chambers at top and right) rather than by the sinoatrial node, the normal heartbeat initiator.
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