The mechanism of synchronization in isorhythmic A-V dissociation. II. Clinical studies

M N Levy, J Edflstein


The electrocardiographic patterns recorded from seven patients with isorhythmic A-V dissociation fall into two distinct groups. In pattern I, the P wave fluctuates cyclically back and forth across the QRS complex. The mechanism responsible for this type of A-V synchronization represents a typical biologic feedback control system. The P-R interval is a determinant of stroke volume, which in turn influences the arterial blood pressure. The blood pressure has an inverse effect on the discharge frequency of the S-A node through the baroreceptor reflex. The S-A nodal frequency then affects the P-R interval, to close the feedback loop. In pattern II, the P wave is in a fairly constant position relative to the QRS complex. It is usually coincident with the QRS complex or appears on the ST segment or first half of the T wave. The mechanism producing synchronization in pattern II type of isorhythmic dissociation has not been established conclusively.


Jan 1, 1969·The American Journal of Medicine·A BenchimolD Franklin
Mar 1, 1970·The Journal of Clinical Investigation·J RuskinJ C Greenfield
Jan 1, 1968·Minnesota Medicine·M T Stillman
Jul 1, 1969·American Heart Journal·J V Reid
Mar 1, 1956·The American Journal of Medicine·R P GRANT
Feb 1, 1958·The American Journal of Medicine·A F SCHUBARTR J GORTEN
Nov 1, 1958·The American Journal of Cardiology·H J MarriottS M BRADLEY
Mar 1, 1959·The American Journal of the Medical Sciences·K H AVERILL, L E LAMB
May 1, 1963·The American Journal of Cardiology·P SametR SHANE
Apr 1, 1963·The American Journal of Physiology·S K BROCKMAN
Sep 1, 1963·The American Journal of Physiology·N S SKINNERS J SARNOFF
Dec 15, 1963·The Japanese Journal of Physiology·J IRIUCHIJIMA, M KUMADA
Oct 15, 1964·The Japanese Journal of Physiology·J IRIUCHIJIMA, M KUMADA
Feb 1, 1965·The American Journal of Cardiology·P SametS LEVINE


Mar 1, 1974·Progress in Cardiovascular Diseases·R M Norris, C J Mercer
Mar 16, 2011·Journal of Agricultural and Food Chemistry·Sinead Eileen MilnerAnita Rose Maguire
Oct 1, 1991·Acta Anaesthesiologica Scandinavica·L Fonsmark, J Wolff
Jul 6, 2000·Pacing and Clinical Electrophysiology : PACE·R T WakaiC B Martin
Jan 25, 2012·Journal of Veterinary Internal Medicine·M PeregoR A Santilli
Oct 8, 2009·Biomedizinische Technik. Biomedical Engineering·Jan SpillnerRüdiger Autschbach
Sep 16, 2011·Journal of the American Veterinary Medical Association·Reid K Nakamura, Danielle L Yuhas
Apr 28, 2009·International Journal of Cardiology·R DennertH J G M Crijns
Jun 16, 2009·Progress in Cardiovascular Nursing·Aimee LeeKimberly Scheibly
Jul 21, 2012·Journal of Cardiovascular Electrophysiology·John RoshanVijay S Chauhan
Jul 1, 1978·The American Journal of Cardiology·C AlicandriV Morant
Apr 1, 1985·The American Journal of Medicine·P Schweitzer, L E Teichholz
Oct 1, 1992·Journal of Cardiothoracic and Vascular Anesthesia·D E Solomon, J N Rogers
Nov 8, 1972·The American Journal of Cardiology·E B StinsonE Dong
Apr 1, 1977·Journal of Electrocardiology·E KaplinskyH N Neufeld
Jan 1, 1972·American Heart Journal·K L Paulay, A N Damato
Jul 9, 2010·The American Journal of Medicine·William J KostisCharles A Henrikson
Dec 1, 1974·American Heart Journal·A Pick, R Langendorf
Nov 1, 1971·The American Journal of Cardiology·R Langendorf, A Pick
Aug 22, 2015·Journal of the American Veterinary Medical Association·Giovanni RomitoMario Cipone
Mar 12, 2010·Current Sports Medicine Reports·Kim M Forman, Glenn D Burns
Jan 23, 2019·Journal of the American Veterinary Medical Association·Kelly E Wiggen, Carley Saelinger
May 1, 1974·British Heart Journal·S Gavrilescu, C Luca
Nov 13, 2004·The American Journal of Geriatric Cardiology·Dennis A Tighe
Apr 13, 2006·Proceedings·D Luke GlancyEnrique M Velasquez
Jan 31, 2020·Clinical Case Reports·John-Ross David ClarkeStuart Zarich
Oct 20, 2015·Journal of the American Veterinary Medical Association·Giorgia SantarelliMa Josefa Fernández del Palacio
Apr 28, 2018·Journal of the American Veterinary Medical Association·Chloë L BlockAnna R Gelzer
Jul 24, 2018·Journal of Investigative Medicine High Impact Case Reports·Ying Chi YangThein Tun Aung
Feb 19, 2020·Journal of the American Veterinary Medical Association·Lisa MurphyReid K Nakamura
Nov 1, 1971·Postgraduate Medicine·G B Lee, B C Campion

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