Assisted circulation using cardiomyoplasty together with aortomyoplasty

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Cardiac Physiology

Background:

• Dynamic cardiomyoplasty and aortomyoplasty are surgical techniques aimed at improving ventricular function.
• Skeletal muscle contraction can be synchronized with cardiac cycles to assist heart function.

Purpose of the Study:

• To evaluate the combined efficacy of cardiomyoplasty and aortomyoplasty in managing cardiac dysfunction.
• To compare the effects of combined versus individual procedures on hemodynamic parameters.

Main Methods:

• Three groups of dogs underwent either cardiomyoplasty (Group A), aortomyoplasty (Group B), or both combined (Group C).
• Hemodynamic parameters including left ventricular pressure (LVP), aortic pressures, and their rates of change (dp/dt) were measured.
• The endocardial viability ratio (EVR) was assessed during assisted and unassisted cardiac cycles.

Main Results:

• Group A showed significant increases in LVP, systolic aortic pressure, and LV dp/dt, but no change in diastolic aortic pressure and a decrease in EVR.
• Group B demonstrated significant improvements in diastolic aortic pressure and EVR, with no changes in LVP, LV dp/dt, or systolic aortic pressure.
• Group C exhibited significant improvements across all measured hemodynamic parameters, outperforming both individual procedures.

Conclusions:

• Cardiac assistance utilizing both cardiomyoplasty and aortomyoplasty is superior to either method alone.
• The combined surgical approach offers a more comprehensive enhancement of cardiac function in cases of cardiac dysfunction.
• This study provides evidence for the synergistic benefits of combining dynamic cardiomyoplasty with aortomyoplasty.