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TY - GEN ID - cogprints5238 UR - http://cogprints.org/5238/ A1 - Friedman, Meir A1 - Schweitzer, Paul Y1 - 2006/07// N2 - 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. PB - Indian Pacing and Electrophysiology Group TI - Transient unexpected improvement of AV conduction: What is the mechanism? SP - 182 AV - public EP - 183 ER -