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Related Experiment Videos

Pacemaker syndrome induced by the mode switching algorithm of a DDDR pacemaker.

P Jaïs1, S Barold, D C Shah

  • 1Hôpital Cardiologique du Haut Lévêque, Bordeaux Pessac, France.

Pacing and Clinical Electrophysiology : PACE
|May 11, 1999
PubMed
Summary

Pacemaker mode switching can cause issues by lengthening the postventricular atrial refractory period (PVARP), leading to loss of AV synchrony and pacemaker syndrome. Disabling this feature resolved the patient's symptoms.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • DDDR pacemakers are used to manage bradycardia and maintain atrioventricular (AV) synchrony.
  • Pacemaker syndrome can arise from inappropriate pacing, leading to hemodynamic compromise.
  • First-degree AV block necessitates careful pacemaker programming to ensure optimal function.

Observation:

  • A patient with a DDDR pacemaker and first-degree AV block experienced symptoms mimicking pacemaker syndrome.
  • Paroxysmal sinus tachycardia with a prolonged PR interval was identified as the cause of AV dyssynchrony.
  • The pacemaker's mode switching algorithm created an excessively long postventricular atrial refractory period (PVARP).

Findings:

  • The long PVARP prevented sensing of sinus P waves, disrupting AV synchrony.

Related Experiment Videos

  • This loss of synchrony led to unfavorable hemodynamics and reflex sinus tachycardia.
  • Disabling the mode switching function and shortening the PVARP resolved the patient's symptoms.

    • Implications:

    • Pacemaker mode switching algorithms, while designed to prevent tachyarrhythmias, can inadvertently cause adverse effects.
    • Careful programming of PVARP and mode switching is crucial in patients with underlying AV conduction disease.
    • This case highlights the importance of individualized pacemaker settings to optimize patient outcomes and avoid pacemaker syndrome.