Long-term dynamic cardiomyoplasty improves chronic and acute myocardial energetics in a model of left ventricular dysfunction

Himanshu J. Patel, James J. Pilla, David J. Polidori, Martin St John Sutton, Edward B. Lankford, Michael A. Acker

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Background - We present the first long-term evaluation of myocardial energetics after dynamic cardiomyoplasty (CMP) in a model of left ventricular (LV) dysfunction. Methods and Results - Seventeen dogs underwent rapid ventricular pacing (RVP) to create heart failure. Eight dogs were randomly selected to undergo cardiomyoplasty. All dogs continued RVP for 6 additional weeks, whereas the CMP dogs underwent a simultaneously delivered synchronized muscle wrap conditioning protocol. After termination of RVP at 10 weeks in all dogs, myoplasty dogs continued to receive muscle wrap stimulation until the terminal study. Pressure-volume analysis to assess LV energetics was conducted at baseline and 4 weeks and 3 months after termination of RVP (6 months after baseline). At 6 months, CMP dogs displayed enhanced contractility, lower volumes, and more optimal energetics compared with control animals. Acute muscle wrap stimulation further increased effective contractility and myocardial efficiency compared with unassisted beats. Conclusions - The decrease in NYHA functional class that occurs in patients after dynamic cardiomyoplasty may be secondary to its beneficial effects on long-term myocardial function, volume, and energetics.

Original languageEnglish (US)
Pages (from-to)II346-II351
JournalCirculation
Volume98
Issue number19 SUPPL.
StatePublished - Nov 10 1998

All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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