Effects of supernormal capture on directly measured nonmodulated parasystolic cycles

Augustin Castellanos, Aristides De La Hera, Richard M. Luceri, Ivan J. Mendoza, Robert J. Myerburg

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Pacemaker capture during the supernormal period was seen in a case of modulated parasystole where ectopic cycles occurred without any interposed nonparasystolic beat. This contrasts with previous clinical reports, since, in the latter, the parasystolic cycle length could not be measured directly. As in experimental studies, supernormal modulation resulted in a triphasic phase response curve. Although less likely, similar electrocardiographic changes could be produced by a conceptually different phenomenon, namely full parasystolic resetting due to loss of protection occurring exclusively early in the cycle combined with modulation in the other (late) parts of the cycle.

Original languageEnglish (US)
Pages (from-to)293-296
Number of pages4
JournalJournal of Electrocardiology
Issue number4
StatePublished - Oct 1989


  • Holter recordings
  • parasystolic modulation
  • supernormalperiod
  • ventricular parasystole

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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