Dopirak M R, Schaal S F, Leier C V
J Electrocardiol. 1980 Apr;13(2):185-8. doi: 10.1016/s0022-0736(80)80052-5.
A 41 year old woman underwent electrophysiological studies for the evaluation of paroxysmal supraventricular tachycardia. AV nodal conduction time and refractory period plots (atrial extra-stimulus technique) suggested the presence of triple AV nodal pathways.