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@misc{cogprints5238, volume = {6}, number = {3}, month = {July}, author = {Meir Friedman and Paul Schweitzer}, editor = {Balbir Singh and Yash Lokhandwala and Johnson Francis and Anup Gupta and Joydeep Ghosh}, title = {Transient unexpected improvement of AV conduction: What is the mechanism? }, publisher = {Indian Pacing and Electrophysiology Group}, year = {2006}, journal = {Indian Pacing and Electrophysiology Journal}, pages = {182--183}, url = {http://cogprints.org/5238/}, abstract = {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. } }