creators_name: Friedman, Meir
creators_name: Schweitzer, Paul
editors_name: Singh, Balbir
editors_name: Lokhandwala, Yash
editors_name: Francis, Johnson
editors_name: Gupta, Anup
editors_name: Ghosh, Joydeep
type: journalp
datestamp: 2006-10-28
lastmod: 2011-03-11 08:56:41
metadata_visibility: show
title: Transient unexpected improvement of AV conduction: What is the mechanism?

ispublished: pub
subjects: ipej
full_text_status: public
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.  
date: 2006-07
date_type: published
publication: Indian Pacing and Electrophysiology Journal
volume: 6
number: 3
publisher: Indian Pacing and Electrophysiology Group
pagerange: 182-183
refereed: TRUE
referencetext: 1. Pick A, Langerdorf R, Katz LN. The supernormal phase of atrioventricular conduction. I Fundamental mechanisms. Circulation 1962; 26: 388-404.

2. Schamroth L. The disorder of cardiac rhythm.  Blackwell Scientific publications, Oxford and Edinburgh.  1971; 271-279.

3. Rashid A, Massumi RA, Amsterdan EA, Mason DT. Phenomenon of supernormality in the human heart. Circulation 1972; 46:264-275.

4. Moe GK, Childers RW, Merideth J.  An appraisal of supernormal AV conduction. Circulation 1968; 38:5-28.

5. Gallagher JJ, Damato AN, Varghese PJ, Caracta AR, Josephson ME, Lau SH. Alternative mechanisms of apparent supernormal atrioventricular conduction.  Am J Cardiol. 1973;31: 362-371. 

citation:   Friedman, Meir and Schweitzer, Paul  (2006) Transient unexpected improvement of AV conduction: What is the mechanism?  [Journal (Paginated)]     
document_url: http://cogprints.org/5238/1/friedman.htm
document_url: http://cogprints.org/5238/2/friedman.pdf