Intermittent parasystole with exit block

Agustin Castellanos, Federico Moleiro, Julio Guerrero, Mohammed I. Awaad, Robert J. Myerburg

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


A 53-year-old patient had a complex ventricular arrhythmia, which most likely was an intermittent pure (nonmodulated) parasystole, due to protection limited to the first part of the cycle coexisting with exit block. However, other interpretations of the observations were possible. Foremost among these was modulated parasystole with partial protection or with an attenuated or nondetectable early delaying phase, with exit block. Interestingly, the parasystole appeared to have fulfilled the dynamic rules regarding the number of sinus beats interposed between manifest parasystolic beats, as has been reported for pure or weakly modulated parasystole. This case corroborates unusual manifestations of an arrhythmia, which because of its newly found complexities and various possible interpretations seems to be discussed with decreasing frequency in most textbooks on general cardiology.

Original languageEnglish (US)
Pages (from-to)331-335
Number of pages5
JournalJournal of Electrocardiology
Issue number4
StatePublished - 1997
Externally publishedYes


  • Dynamic rules
  • Exit block
  • Intermittent parasystole
  • Modulated parasystole
  • Partial protection
  • Ventricular arrhythmia

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


Dive into the research topics of 'Intermittent parasystole with exit block'. Together they form a unique fingerprint.

Cite this