(V: Premature ventricular contraction
V couplet: Ventricular couplet
V short run: Short ventricular run (non-sustained ventricular tachycardia)
V long run: Long ventricular run (sustained ventricular tachycardia)
V bigeminy: Ventricular bigeminy
V trigeminy: Ventricular trigeminy)
(S: Premature supraventricular contraction
S couplet: Supraventricular couplet
S short run: Short supraventricular run (non-sustained SVT)
S long run: Long supraventricular run (sustained SVT)
S bigeminy: Supraventricular bigeminy
S trigeminy: Supraventricular trigeminy)