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. 2010 Jul 9;299(4):H1002–H1011. doi: 10.1152/ajpheart.01237.2009

Fig. 3.

Fig. 3.

Temporary CB in the PS. A: 372 ms. An ectopic beat triggered an AP in the right distal PS. Excitation spread to right ventricle (RV; white arrow) and throughout the right distal PS (black arrow). B: 394 ms. The proximal right bundle branch (RBB) was still refractory, which caused temporary CB. C: 425 ms. Excitation spread through myocardium across the ventricular to reach the left ventricle (LV) and excited the left distal PS. D: 432 ms. The excitation spread through the left PS, and the left bundle branch (LBB), but the RBB was refractory, causing another temporary CB. E: individual AP traces (1–5) from five locations show retrograde conduction failure (dotted line) in the RBB. *The occurrence of CB at the corresponding location. P-V, anterograde conduction from PS to myocardium; V-P, retrograde conduction from myocardium to PS; P-P, retrograde conduction within the PS. Times are relative to the last His stimulation.