Her Holter ECG revealed sinus rhythm with intermittent Mobitz type 1 AV block at rest, which worsened during exercise, indicating a need for further evaluation.doi:10.1111/pace.15078Keerthika VijayakumarShisheer Havangi PrakashMalini MadhavanPacing and Clinical Electrophysiology...
the sports literature with claims that narrow QRS type II AV block can also occur in otherwise healthy young athletes2,–,7 and less commonly after exercise in the form of vasovagal syncope (table 1).8 These reports of type II block in athletes provided either no ECG or misdiagnosed ones....
Recently [6鈥 8], it has been suggested that Mobitz II block does not exist as a separate entity, but merely represents a Wenckebach periodicity in which prolongation of the conduction time is so small that it is not detectable on the surface ECG. This latter hypothesis has been considered ...