Modulation of Atrioventricular Junctional Parasystole During Atrial Pacing


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In this report we describe a case of a 68‐year‐old man with atrioventricular junctional parasystole in whom atrial pacing caused marked changes in (he arrhythmic pattern. During afrial pacing at a cycle length of 960 ms, the duration of the ectopic cycle length was influenced by the inferval between the parasystolic and nonparasystoUc beat. A shorter interval from nonparasystolic to ectopic beat prolonged the ectopic cycle length and a longer one shortened it. Pacing at a cycle length of 900 ms completely suppressed the parasystole. Both of these changes are most likely due to modulation and entrainment of the parasystolic rhythm. During spontaneous variation of the sinus cycle length over 24 hours of ambulatory ECG recording, modulation could not be confirmed; however, there was parallel variation of the ectopic and sinus cycle lengths which suggests that both pacemakers were under the influence of the autonomic nervous system.

Original languageEnglish
Pages (from-to)114-119
Number of pages6
JournalPACE - Pacing and Clinical Electrophysiology
Issue number1
StatePublished - Jan 1988


  • atrioventricular junction
  • modulation
  • pacing
  • parasystole


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