Paradoxical behavior of PR interval dynamics during exercise and recovery and its relationship to cardiac memory at the atrioventricular node

Federico Moleiro, Francesca Misticchio, Ivan Mendoza, Ana Rodriguez, Agustin Castellanos, Robert J. Myerburg

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

This preliminary study deals with the dynamics of the PR interval during exercise testing by using a Bruce protocol in 31 nonmedicated, normal patients with ages of 33 ± 14 years. The behavior of the PR interval permitted its categorization into 2 groups. In Group I (27 of 31, 87.1% of patients) the PR interval showed the expected biphasic behavior with a gradual shortening with increasing exercise and a gradual lengthening during recovery. In contrast, the PR interval in Group II (4 of 31, 12.9% of patients) showed a triphasic behavior since, toward the end of recovery, there was a second decrease in duration. Because of this temporal relation to the phases of exercise, this paradoxical response, in analogy to what happened to the QT interval during exercise, could have been caused by a form of short-term memory or to varying, but normal, intergroup differences in autonomic function. However, further studies involving a greater number of patients are required to reach definite conclusions.

Original languageEnglish (US)
Pages (from-to)31-34
Number of pages4
JournalJournal of Electrocardiology
Volume34
Issue number1
DOIs
StatePublished - Jan 1 2001

Keywords

  • Action potential duration
  • Atrioventricular node
  • Cardiac memory
  • Exercise testing
  • PR interval

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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