Effects of the pacing site in sinus node reentrant tachycardia

Agustin Castellanos, Juan Aranda, Federico Moleiro, Stephen M. Mallon, Benjamin Befeler

Research output: Contribution to journalArticlepeer-review


His bundle recordings and premature atrial stimulation from coronary sinus, mid-right atrium and high-right atrium were performed in a patient with repetitive supraventricular tachycardias. Regardless of the paced site, there was a range of coupling intervals during which testing stimuli elicited short runs of premature beats. The corresponding P waves were positive in leads I, II and II and had a high-to-low right atrial activation sequence. Their morphology was similar to that of sinus beats. However, sustained tachycardia occurred only when pacing was performed from the coronary sinus. Therefore, it is postulated that the site of stimulation might be important in the genesis and (perhaps) perpetuation of this arrhythmia by changing the site and (or) mode of entry into the area where this type of tachycardia occurs. Though sinus node reentry was the most likely mechanism, it could not be determined whether the circuit involved the sinus node per se or the so called perinodal fibers.

Original languageEnglish (US)
Pages (from-to)165-169
Number of pages5
JournalJournal of Electrocardiology
Issue number2
StatePublished - 1976
Externally publishedYes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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