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--- 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 chapter: ~ commentary: ~ commref: ~ confdates: ~ conference: ~ confloc: ~ contact_email: ~ creators_id: [] 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 edit_lock_since: ~ edit_lock_until: ~ edit_lock_user: ~ 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 full_text_status: public importid: ~ institution: ~ isbn: ~ ispublished: pub issn: ~ item_issues_comment: [] item_issues_count: 0 item_issues_description: [] item_issues_id: [] item_issues_reported_by: [] item_issues_resolved_by: [] item_issues_status: [] item_issues_timestamp: [] item_issues_type: [] keywords: ~ lastmod: 2011-03-11 08:56:41 latitude: ~ longitude: ~ 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: [] relation_uri: [] 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