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Related Experiment Videos

Which is the optimal testing method for identifying an AV delay that allows intrinsic conduction?

L E Eguía1, S L Pinski, J Haw

  • 1Section of Cardiology, Rush-Presbyterian-St. Luke's Medical Center and Rush Medical College, Chicago, Illinois, USA.

Pacing and Clinical Electrophysiology : PACE
|January 5, 2001
PubMed
Summary

Determining the optimal atrioventricular (AV) delay in dual-chamber pacemakers is crucial. A decremental (outside-in) method is more effective than an incremental (inside-out) approach for finding the shortest AV delay that prevents ventricular pseudofusion.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Maintaining normal ventricular activation is essential for patients with dual-chamber pacemakers and preserved atrioventricular (AV) conduction.
  • Dual-chamber pacemakers require precise programming of AV delay to optimize cardiac function and prevent adverse events like ventricular pseudofusion.

Purpose of the Study:

  • To compare the efficacy of incremental (inside-out) versus decremental (outside-in) techniques in determining the shortest AV delay that ensures consistent ventricular inhibition.
  • To identify the optimal method for programming AV delays in VDD and DDD pacing modes to avoid ventricular pseudofusion.

Main Methods:

  • The study involved 20 patients with dual-chamber pacemakers and preserved AV conduction.
  • Two methods were used to determine the shortest AV delay: a conventional incremental (inside-out) technique and an alternate decremental (outside-in) technique.

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  • Determinations were performed in VDD mode and DDD mode (at a rate 10 beats/min faster than intrinsic rate).

    • Main Results:

    • In VDD mode, the shortest AV delay avoiding ventricular pseudofusion was never identified using the inside-out method. The outside-in method yielded shorter or identical AV delays compared to the inside-out method in all patients (P = 0.004).
    • In DDD mode, the shortest AV delay was found only once with the inside-out method. The outside-in method identified shorter AV delays in 26% of patients (P = 0.18).
    • The decremental (outside-in) method was more likely to identify the shortest AV delay preventing ventricular pseudofusion.

    Conclusions:

    • The decremental (outside-in) method is superior for determining the shortest atrioventricular (AV) delay that prevents ventricular pseudofusion in patients with dual-chamber pacemakers.
    • The conventional incremental (inside-out) approach may fail to identify optimal AV delays, potentially leading to persistent ventricular pacing.
    • Accurate AV delay programming using the outside-in technique can improve pacemaker function and patient outcomes.