Document Detail

"Irregular" ventricular parasystole: the influence of sinus rhythm on a parasystolic focus.
MedLine Citation:
PMID:  3336967     Owner:  NLM     Status:  MEDLINE    
Fifteen cases of ventricular parasystole were analyzed to determine whether the interectopic intervals were regular, as expressed 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.
G Oreto; G Satullo; F Luzza; A Donato; C M Saccá; F Arrigo; F Consolo; L Schamroth
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American heart journal     Volume:  115     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1988 Jan 
Date Detail:
Created Date:  1988-01-28     Completed Date:  1988-01-28     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  121-33     Citation Subset:  AIM; IM    
Istituto Pluridisciplinare di Clinica Medica e Terapia Medica Generale e Speciale dell'Universitá degli Studi di Messina, Italy.
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MeSH Terms
Arrhythmias, Cardiac / physiopathology*
Child, Preschool
Heart Ventricles / physiopathology
Middle Aged
Sinoatrial Node / physiopathology*

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