Fig. 4
From: Accessory pathways in monozygotic twins with different clinical phenotypes: a case report
Electrophysiology study in identical twins. A: Abolition of right posteroseptal accessory pathway in 3.7 s during ventricular pacing with increased ventriculoatrial interval from 78 to 170 ms in twin A. B: Abolition of right-sided midseptal anterograde accessory pathway in 2.6 s with classic atrioventricular fusion on ablation catheter (red arrows) in twin B. CS = coronary sinus; HIS = His-bundle; ABL = ablation catheter at the successful site of accessory pathway ablation; UNI = unipolar