Complete atrioventricular block caused by pacing from proximal coronary sinus: What is the mechanism?

The article presents a case study of a 44-year-old male patient with repeated syncope for 5 years referred to our hospital. An electrophysiological study was performed. In addition, increasing the output from the proximal CS region may alter the atrial inputs by penetrating the AV node at more than one input. This phenomenon of treatment can be explained as vagal response caused by adjacent vagus ganglion capture.