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Optimizing muscle-to-cardiac timing for aortomyoplasty

D R Thompson1, B L Cmolik, E A Cheever

  • 1Division of Cardiothoracic Surgery, School of Medicine, Case Western Reserve University, Cleveland, OH 44106-4929, USA.

Biomedical Sciences Instrumentation
|January 1, 1997
PubMed
Summary
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Optimizing aortomyoplasty involves precise muscle stimulation timing. Synchronizing latissimus dorsi muscle contraction with the cardiac cycle maximizes diastolic augmentation and improves heart support.

Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Cardiac Physiology

Background:

  • Aortomyoplasty is a surgical technique using the latissimus dorsi muscle for diastolic counterpulsation in heart failure.
  • The effectiveness of aortomyoplasty may depend on the precise timing of muscle stimulation relative to the cardiac cycle.

Purpose of the Study:

  • To investigate the impact of muscle-to-cardiac timing on the hemodynamic outcomes of aortomyoplasty.
  • To determine the optimal timing for latissimus dorsi muscle stimulation during diastole for enhanced counterpulsation.

Main Methods:

  • The study utilized a canine model (n=9, 20-25 kg).
  • Aortomyoplasty was performed, and the latissimus dorsi muscle was stimulated.
  • Muscle stimulation was initiated at the dicrotic notch, with systematic variations in stimulus duration to assess hemodynamic effects.

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Main Results:

  • Maximum mean diastolic aortic pressure was achieved when muscle stimulation terminated at the R-wave.
  • Peak left-ventricular pressure was minimized when stimulation ended before the R-wave.
  • The endocardial-viability ratio was maximized when stimulus termination coincided with the R-wave.

Conclusions:

  • Muscle-to-cardiac timing significantly influences the effectiveness of counterpulsation in aortomyoplasty.
  • Optimal timing of latissimus dorsi muscle stimulation is crucial for maximizing diastolic augmentation and improving hemodynamic performance.