Abstract
This study deals with a method of analysis of artificial pacemaker function which can be used to understand the electrocardiographic manifestations of some spontaneous rhythms. The modes of operation of 11 normally-functioning QRS-inhibited (VVI) pacemakers resembled those of spontaneous automatic nonprotected (nonparasystolic) rhythms. The function of 11 continuous asynchronous (fixed rate or VOO) pacemakers was similar to that of continuous-parasystolic rhythms. In 12 patients with malfunctioning QRS-inhibited (VVI) pacemakers, an abnormally-prolonged pacemaker refractory period was equivalent to intermittent parasystole with phase 3 protection; and non-sensing during the terminal portions of the cycle was the iatrogenic counterpart of intermittent parasystole with phase 4 protection. Premature beats occuring within the periods of phase 3 and phase 4 protection were 'encompassed' by ectopic intervals equalling the ectopic cycle length, or twice the ectopic cycle length. Therefore, they were manifested differently from the 'decelerating' and 'accelerating' phases of modulation since premature beats occurring during the letter phases may be encompassed by ectopic intervals which are longer and shorter, respectively, than the ectopic cycle lenght. Because in previous reports the search for these phenomena was based on premises established 'a priori', future studies should be designed to tracing of 'group beating' where no previous conclusions have been reached.
| Original language | English |
|---|---|
| Pages (from-to) | 537-545 |
| Number of pages | 9 |
| Journal | PACE - Pacing and Clinical Electrophysiology |
| Volume | 5 |
| Issue number | 4 |
| DOIs | |
| State | Published - Dec 1 1982 |
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ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
Cite this
Electronic pacemaker models of parasystole. With special reference to artificial intermittent parasystole with phase 3 and phase 4 protection and to parasystolic modulation. / Castellanos, Agustin; Castillo, C. A.; Medina-Ravell, V.; Moleiro, F.; Berkovits, B. V.; Myerburg, Robert J.
In: PACE - Pacing and Clinical Electrophysiology, Vol. 5, No. 4, 01.12.1982, p. 537-545.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electronic pacemaker models of parasystole. With special reference to artificial intermittent parasystole with phase 3 and phase 4 protection and to parasystolic modulation
AU - Castellanos, Agustin
AU - Castillo, C. A.
AU - Medina-Ravell, V.
AU - Moleiro, F.
AU - Berkovits, B. V.
AU - Myerburg, Robert J
PY - 1982/12/1
Y1 - 1982/12/1
N2 - This study deals with a method of analysis of artificial pacemaker function which can be used to understand the electrocardiographic manifestations of some spontaneous rhythms. The modes of operation of 11 normally-functioning QRS-inhibited (VVI) pacemakers resembled those of spontaneous automatic nonprotected (nonparasystolic) rhythms. The function of 11 continuous asynchronous (fixed rate or VOO) pacemakers was similar to that of continuous-parasystolic rhythms. In 12 patients with malfunctioning QRS-inhibited (VVI) pacemakers, an abnormally-prolonged pacemaker refractory period was equivalent to intermittent parasystole with phase 3 protection; and non-sensing during the terminal portions of the cycle was the iatrogenic counterpart of intermittent parasystole with phase 4 protection. Premature beats occuring within the periods of phase 3 and phase 4 protection were 'encompassed' by ectopic intervals equalling the ectopic cycle length, or twice the ectopic cycle length. Therefore, they were manifested differently from the 'decelerating' and 'accelerating' phases of modulation since premature beats occurring during the letter phases may be encompassed by ectopic intervals which are longer and shorter, respectively, than the ectopic cycle lenght. Because in previous reports the search for these phenomena was based on premises established 'a priori', future studies should be designed to tracing of 'group beating' where no previous conclusions have been reached.
AB - This study deals with a method of analysis of artificial pacemaker function which can be used to understand the electrocardiographic manifestations of some spontaneous rhythms. The modes of operation of 11 normally-functioning QRS-inhibited (VVI) pacemakers resembled those of spontaneous automatic nonprotected (nonparasystolic) rhythms. The function of 11 continuous asynchronous (fixed rate or VOO) pacemakers was similar to that of continuous-parasystolic rhythms. In 12 patients with malfunctioning QRS-inhibited (VVI) pacemakers, an abnormally-prolonged pacemaker refractory period was equivalent to intermittent parasystole with phase 3 protection; and non-sensing during the terminal portions of the cycle was the iatrogenic counterpart of intermittent parasystole with phase 4 protection. Premature beats occuring within the periods of phase 3 and phase 4 protection were 'encompassed' by ectopic intervals equalling the ectopic cycle length, or twice the ectopic cycle length. Therefore, they were manifested differently from the 'decelerating' and 'accelerating' phases of modulation since premature beats occurring during the letter phases may be encompassed by ectopic intervals which are longer and shorter, respectively, than the ectopic cycle lenght. Because in previous reports the search for these phenomena was based on premises established 'a priori', future studies should be designed to tracing of 'group beating' where no previous conclusions have been reached.
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UR - http://www.scopus.com/inward/citedby.url?scp=0020327497&partnerID=8YFLogxK
U2 - 10.1111/j.1540-8159.1982.tb02275.x
DO - 10.1111/j.1540-8159.1982.tb02275.x
M3 - Article
C2 - 6180396
AN - SCOPUS:0020327497
VL - 5
SP - 537
EP - 545
JO - PACE - Pacing and Clinical Electrophysiology
JF - PACE - Pacing and Clinical Electrophysiology
SN - 0147-8389
IS - 4
ER -