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Automatic management of left ventricular stimulation: hints for technologic improvement.

Mauro Biffi¹, Matteo Bertini, Davide Saporito

¹Institute of Cardiology, University of Bologna, Via Massarenti 9, Bologna, Italy. mauro.biffi@aosp.bo.it

Pacing and Clinical Electrophysiology : PACE

|March 11, 2009

Summary

Left ventricular (LV) threshold variability is minimal, with 99-100% effective stimulation achieved in most patients using an automatic verification algorithm. This approach also enhances cardiac resynchronization therapy defibrillator device longevity.

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Published on: February 28, 2012

Area of Science:

Cardiology
Biomedical Engineering
Medical Device Technology

Background:

Cardiac resynchronization therapy defibrillator (CRT-D) devices utilize algorithms for automatic left ventricular (LV) stimulation verification.
Understanding LV threshold variability is crucial for optimizing CRT-D algorithm programming and performance.
Long-term evaluation of CRT-D algorithm performance and stimulation settings was conducted to maximize device longevity.

Purpose of the Study:

To investigate the variability of left ventricular (LV) stimulation thresholds in patients with CRT-D devices.
To provide insights for programming the automatic verification algorithm features.
To assess the long-term performance of the algorithm and test a stimulation setting for high efficacy and device longevity.

Main Methods:

Utilized a CRT-D device with an automatic LV stimulation verification algorithm.
Programmed LV output at threshold + 0.5 V with a 6 V upper limit and minimized voltage multipliers.
Conducted follow-ups at 1 month and every 3 months, including Holter validation for long-term efficacy assessment.

Main Results:

LV threshold remained stable on 97% of days, with minimal variability (< or =0.5 V) during 90% of the follow-up period.
Achieved 99-100% effective LV stimulation in 18 of 20 patients.
Demonstrated a potential 25% increase in device longevity with the tested programming strategy.

Conclusions:

Left ventricular (LV) threshold variability is modest, suggesting that daily updates of LV threshold could enhance stimulation reliability.
A safety margin of threshold + 0.5 V is recommended for ensuring consistent LV stimulation.
Optimizing LV stimulation below battery voltage maximizes device longevity.