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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Phrenic stimulation: a challenge for cardiac resynchronization therapy.

Mauro Biffi1, Carlotta Moschini, Matteo Bertini

  • 1Institute of Cardiology, Policlinico S. Orsola-Malpighi, University of Bologna, Italy.

Circulation. Arrhythmia and Electrophysiology
|October 8, 2009
PubMed
Summary
This summary is machine-generated.

Phrenic stimulation (PS) frequently hinders cardiac resynchronization therapy (CRT), especially with lateral LV lead placement. Bipolar leads and cathode programmability are essential for managing PS and ensuring CRT effectiveness.

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Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Phrenic stimulation (PS) is a potential complication of cardiac resynchronization therapy (CRT) that can interfere with left ventricular (LV) pacing.
  • Understanding the prevalence and management of PS is crucial for optimizing CRT outcomes.

Purpose of the Study:

  • To prospectively assess the prevalence of phrenic stimulation (PS) in patients receiving cardiac resynchronization therapy (CRT) devices.
  • To evaluate the impact of PS on LV pacing and reverse remodeling.
  • To identify strategies for managing PS during CRT implantation and follow-up.

Main Methods:

  • Prospective observation of 197 consecutive patients undergoing CRT implantation between 2003 and 2006.
  • Measurement of PS and LV pacing thresholds at implantation and 6-month follow-up.
  • Echocardiographic assessment of LV reverse remodeling.
  • Analysis of LV lead placement (86% lateral/posterolateral).

Main Results:

  • PS was detected in 37% of patients, clinically relevant in 22%.
  • PS and LV reverse remodeling were most frequent at lateral/posterolateral LV pacing sites (P<0.001).
  • PS detection at implantation had low sensitivity; 5% required device revision, and 2% had CRT deactivated.

Conclusions:

  • Phrenic stimulation (PS) can significantly impede cardiac resynchronization therapy (CRT).
  • Bipolar LV leads and cathode programmability are essential for optimizing pacing vectors and managing PS.
  • LV lead stability at target sites and automatic LV output adjustment can further mitigate PS complications.