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Related Experiment Videos

Effect of varying atrial sensitivity, AV interval, and detection algorithm on automatic mode switching

E C Palma1, V Kedarnath, V Vankawalla

  • 1Pacemaker Center, Montefiore Medical Center, Bronx, New York 10467, USA.

Pacing and Clinical Electrophysiology : PACE
|November 1, 1996
PubMed
Summary

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Automatic mode switching (AMS) requires sensitive atrial settings for effective tachyarrhythmia detection. Shorter AV intervals and stringent algorithms can hinder AMS efficacy in pacemakers.

Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Automatic mode switching (AMS) is a pacemaker feature dependent on accurate atrial tachyarrhythmia detection.
  • Optimizing AMS efficacy requires understanding the impact of various programming parameters on detection capabilities.

Purpose of the Study:

  • To assess the effects of programming specific features on atrial tachyarrhythmia detection for AMS efficacy.
  • To evaluate the influence of atrial electrogram amplitude, AV intervals, and detection algorithms on AMS performance.

Main Methods:

  • Studied 18 pacemaker patients with AMS capability.
  • Recorded atrial electrogram amplitude in sinus rhythm (SR-EGM), atrial sensing threshold (A-SENS), and AMS sensing threshold (AMS-SENS).
  • Assessed effects of increased AV intervals (60-200 ms) and stringent detection algorithms (e.g., 11 beats at 200 bpm vs. 5 beats at 150 bpm).

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Main Results:

  • Effective AMS in atrial fibrillation required more sensitive atrial settings (mean AMS-SENS = 1.46 mV) than in normal sinus rhythm (mean SR-EGM = 3.55 mV).
  • AMS efficacy was compromised in some patients with atrial fibrillation (6/14) and atrial flutter (1/4) at standard settings.
  • AMS remained effective up to 200 ms AV intervals in most patients (8/10), but one lost function at 120 ms.
  • More stringent detection algorithms (11 beats at 200 bpm) rendered AMS ineffective in 2/7 patients.

Conclusions:

  • Effective AMS in atrial fibrillation necessitates more sensitive atrial sensing parameters compared to normal sinus rhythm.
  • Short AV intervals, particularly 120 ms, can impede AMS functionality.
  • Overly stringent tachyarrhythmia detection algorithms may be unsuitable for ensuring effective AMS operation.