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%A Meir Friedman %A Paul Schweitzer %J Indian Pacing and Electrophysiology Journal %T Transient unexpected improvement of AV conduction: What is the mechanism? %X This ECG was recorded from a 93 year old patient with a previously documented third degree AV block and an underlying LBBB. The twelve lead ECG demonstrates sinus bradycardia at a rate of 52 beats per minute, a PR interval of 230 milliseconds, and a left bundle branch block (Figure 1). In figure 2, a rhythm strip of leads V1, II and V5 shows sinus rhythm with AV block. Note that only P waves in the T wave of the paced beat are conducted. The non-conducted P waves are followed by ventricular paced beats at an escape interval of 1200 milliseconds. %N 3 %P 182-183 %E Balbir Singh %E Yash Lokhandwala %E Johnson Francis %E Anup Gupta %E Joydeep Ghosh %V 6 %D 2006 %I Indian Pacing and Electrophysiology Group %L cogprints5238