Electrocardiography of Rate-Adaptive Dual-Chamber (DDDR) Pacemakers: Lower Rate Behavior

  • S. S. Barold

Abstract

The lower rate interval (LRI) is the most basic and important interval of single- and dual-chamber pacemakers. Many manufacturers of DDD pulse generators utilize a VV timing or ventricular-based timing system for control of the LRI of their devices. The LRI of a dual-chamber pulse generator is tradtitionally defined as the longest interval from a sensed or paced ventricular event to the succeeding ventricular stimulus [1]. The atrial escape (pacemaker VA) interval is defined as the interval from a ventricular paced or sensed event to the subsequent atrial paced event (provided there are no intervening atrial or ventricular sensed events). A ventricular sensed event either in the atrioventricular (AV) interval or atrial escape interval (AEI) resets both the LRI and the AEI so that both start again. Constancy of the atrial escape (pacemaker VA) interval is the cardinal feature of V-V lower rate timing (LRT). Hence, the term “V-V timing” is often used interchangeably with “VA timing” to emphasize constancy of the AEI in ventricular-based LRT [2].

Keywords

Assure Symbios 

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Copyright information

© Springer Verlag, Berlin Heidelberg 1993

Authors and Affiliations

  • S. S. Barold
    • 1
  1. 1.Division of Cardiology, Department of Medicine, The Genesee HospitalUniversity of Rochester School of Medicine and DentistryRochesterUSA

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