A type of cardiac arrhythmia with premature ventricular contractions or beats caused by signals originating from ectopic sites. The disease is Experimental Factor Ontology term EFO_0009276 (ventricular ectopy). Also known as: PVC, PVCs, VPB, VPCs, extrasystole, premature ventricular beats, premature ventricular complex, premature ventricular contractions.