---
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. '
altloc:
- http://www.ipej.org/0603/friedman.htm
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creators_name:
- family: Friedman
given: Meir
honourific: ''
lineage: ''
- family: Schweitzer
given: Paul
honourific: ''
lineage: ''
date: 2006-07
date_type: published
datestamp: 2006-10-28
department: ~
dir: disk0/00/00/52/38
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editors_id: []
editors_name:
- family: Singh
given: Balbir
honourific: ''
lineage: ''
- family: Lokhandwala
given: Yash
honourific: ''
lineage: ''
- family: Francis
given: Johnson
honourific: ''
lineage: ''
- family: Gupta
given: Anup
honourific: ''
lineage: ''
- family: Ghosh
given: Joydeep
honourific: ''
lineage: ''
eprint_status: archive
eprintid: 5238
fileinfo: /style/images/fileicons/text_html.png;/5238/1/friedman.htm|/style/images/fileicons/application_pdf.png;/5238/2/friedman.pdf
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lastmod: 2011-03-11 08:56:41
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metadata_visibility: show
note: ~
number: 3
pagerange: 182-183
pubdom: TRUE
publication: Indian Pacing and Electrophysiology Journal
publisher: Indian Pacing and Electrophysiology Group
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.
relation_type: []
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reportno: ~
rev_number: 14
series: ~
source: ~
status_changed: 2007-09-12 17:08:14
subjects:
- ipej
succeeds: ~
suggestions: ~
sword_depositor: ~
sword_slug: ~
thesistype: ~
title: "Transient unexpected improvement of AV conduction: What is the mechanism?\n"
type: journalp
userid: 4424
volume: 6