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Dependence of the Atrioventricular Conduction Time on the Conduction through the Atrioventricular Node and

Bartosz Żuchowski1, Krzysztof Błaszyk2, Jarosław Piskorski3

  • 1Department of Cardiology Intensive Therapy, Poznan University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznan, Poland.

Journal of Clinical Medicine
|February 25, 2023
PubMed

Insights

Atrioventricular conduction time primarily depends on the atrioventricular node (AVN), not the His-Purkinje system (HPS). Men exhibit longer conduction times, but the relationships between these intervals are similar across sexes.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Conduction System

Background:

  • The cardiac conduction system regulates heart depolarization.
  • Atrioventricular (AV) conduction time is influenced by the atrioventricular node (AVN) and His-Purkinje system (HPS).

Purpose of the Study:

  • To investigate the relationship between AV conduction time (AV interval) and its components, the AH (AVN) and HV (HPS) intervals.
  • To compare sex differences in these electrophysiological intervals and their associations.

Main Methods:

  • Intracardiac electrophysiological recordings were obtained from 64 patients.
  • AH, HV, and AV intervals were measured from resting tracings.
  • Statistical analysis was performed to assess correlations and sex differences.

Main Results:

  • Mean AH interval was 85.9 ms, HV 43.7 ms, and AV 129.6 ms.
  • Men had significantly longer AH, HV, and AV intervals compared to women.
  • AV intervals strongly correlated with AH intervals (r² = 0.65) but not HV intervals (r² = 0.05).

Conclusions:

  • Atrioventricular conduction time is predominantly determined by AVN conduction.
  • The His-Purkinje system has a lesser impact on overall AV conduction time.
  • While men show longer conduction times, the underlying relationships between AVN, HPS, and total AV intervals are similar in both sexes.

Keywords:
His bundleHis–Purkinje systematrioventricular conductionatrioventricular nodeelectrophysiological study

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