Modulation of ventricular parasystole by extraneous depolarizations

Agustin Castellanos, Enrique Melgarejo, Renato Dubois, Richard M. Luceri

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


The ectopic cycle length of a ventricular parasystole was influenced in a predictable fashion (modulated) by nonparasystolic beats. Although the interectopic intervals were not multiples of the ectopic cycle length (as in “classical” parasystole), the diagnosis could be established because: a) nonparasystolic beats falling during the first half of the cycle produced an 8–12% shortening of the ectopic cycle length; and b) nonparasystolic beats occurring during the second half of the cycle decreased the ectopic cycle length by 9–14%. The events occurring in this case are further proof that the classical criteria for the diagnosis of parasystole have to be reevaluated.

Original languageEnglish (US)
Pages (from-to)195-198
Number of pages4
JournalJournal of Electrocardiology
Issue number2
StatePublished - Jan 1 1984

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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