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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
"Irregular" ventricular parasystole: The influence of sinus rhythm on a parasystolic focus
American Heart Journal, Volume 115, No. 1 PART 1, Year 1988
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Description
Fifteen cases of ventricular parasystole were analyzed to determine whether the interectopic intervals were regular, as experessed by long intervals being exact multiples of the short ones, or not. The regularity of the interectopic intervals was assessed by means of the variation index: the ratio of the maximal difference between various measurements of the parasystolic cycle length and the mean parasystolic cycle length. Three out of 15 cases had a variation index less than 5, and were classified as "regular parasystole." Twelve cases were associated with a variation index greater than 7.5, and were classified as "irregular parasystole." The cases of irregular parasystole were then analyzed to determine whether the variability of the interectopic intervals was casual or dependent on action of the sinus beats. A parasystolic resetting by critically timed sinus impulses (a form of intermittent parasystole) was evident in three cases. The irregularity in the remaining nine cases was due to modulation (viz., due to electrotonic influence exerted by the sinus beats on the parasystolic focus). In every case of modulated parasystole a phase-response curve was constructed, which enabled an analysis of all the interectopic intervals on the basis of a time-dependent effect exerted by the sinus impulses on an otherwise rhythmic parasystolic focus. © 1988.
Authors & Co-Authors
Oreto, Giuseppe
Italy, Pavia
Terapia Medica Generale
Satullo, Gaetano
Italy, Pavia
Terapia Medica Generale
Luzza, Francesco
Italy, Pavia
Terapia Medica Generale
Donato, Antonino
Italy, Pavia
Terapia Medica Generale
Saccá, Carmelo Maugeri
Italy, Pavia
Terapia Medica Generale
Arrigo, Francesco
Italy, Pavia
Terapia Medica Generale
Consolò, Fausto
Unknown Affiliation
Schamroth, Leo
South Africa, Johannesburg
University of the Witwatersrand
Statistics
Citations: 22
Authors: 8
Affiliations: 2
Identifiers
Doi:
10.1016/0002-8703(88)90527-3
ISSN:
00028703
e-ISSN:
10976744