Premature ventricular contractions (PVC) or ventricular extrasystoles are premature contractions of the heart that arise in response to an impulse in the ventricles rather than the normal impulse from the sinoatrial (SA) node. The phenotype is HP_0006682 (Premature ventricular contraction). Also known as: Extra heart beat, Premature ventricular beat, Premature ventricular contractions, Ventricular ectopics, Ventricular extrasystoles, Ventricular premature beat.