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Patent Pending Premature ventricular contractions (PVCs), sometimes called ventricular extra beats (VEBs) Premature ventricular beats occurring after every normal beat are termed "ventricular bigeminy" PVCs that occur at intervals of 2 normal beats to 1 PVC are termed "PVCs in trigeminy" Three premature ventricular grouped together is termed a "run of PVCs"; in general, runs lasting longer than three beats are referred to as ventricular tachycardia