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Echocardiographic AV-interval optimization in patients with reduced left ventricular function.

C Melzer1, A C Borges, F Knebel

  • 1I Medizinische Klinik mit Schwerpunkt Kardiologie, Angiologie und Pulmologie, Charité, Campus Mitte, Berlin, Germany. christoph.melzer@charite.de

Cardiovascular Ultrasound
|December 21, 2004
PubMed
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Ritter's method effectively optimizes atrioventricular (AV) delay in pacemaker patients with reduced left ventricular function. This method shows strong correlation with radionuclide ventriculography, confirming its utility for personalized AV interval programming.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Ritter's method is established for optimizing atrioventricular (AV) delay in DDD pacemaker patients with normal left ventricular function.
  • Its efficacy in patients with reduced left ventricular function (LVF) was previously unevaluated.

Purpose of the Study:

  • To evaluate the effectiveness of Ritter's method for AV delay optimization in patients with reduced LVF.
  • To compare AV delay optimization using Ritter's method with radionuclide ventriculography (RNV) in this patient cohort.

Main Methods:

  • Patients with DDD pacemakers and third-degree atrioventricular block were divided into two groups based on ejection fraction (EF): EF > 35% and EF < 35%.
  • AV delay optimization was performed using both RNV and Ritter's method for all participants.

Related Experiment Videos

Main Results:

  • Ritter's method successfully determined optimal AV intervals in all patients, correlating well with RNV-derived intervals.
  • Correlation was particularly strong in patients with reduced EF (intra-class correlation coefficients of 0.8965 and 0.9228 for normal and reduced EF groups, respectively).
  • Optimal AV intervals were 190 ± 28.5 ms for normal EF and 180 ± 35 ms for reduced EF.

Conclusions:

  • Ritter's method is effective for optimizing AV intervals in patients with reduced LVF (EF < 35%).
  • RNV results strongly correlate with those obtained by Ritter's method.
  • Individualized programming of the AV interval is crucial for all pacemaker patients.