Retrograde sharp potential resembling the his-bundle electrogram: is this a case of atrioventricular re-entrant tachycardia involving twin atrioventricular nodes with the anterior node exhibiting only retrograde conduction?
Izumi G, Yokoshiki H, Takeda A.
Cardiol Young. 2020 Sep 9:1-3. doi: 10.1017/S1047951120002747. Online ahead of print.

Fast pathway ablation unmasks nodoventricular fibers in a 15-year-old patient with supraventricular tachycardia.
Izumi G, Yokoshiki H, Sasaki R, Chiba Y, Yamazawa H, Takeda A.
Pacing Clin Electrophysiol. 2020 Oct 12. doi: 10.1111/pace.14088. Online ahead of print.