Abstract
In 9 mongrel dogs, we investigated hemodynamic changes caused by wrapp-ing of latissimus dorsi muscle around the heart and the efficacy of synchronous con-traction of the sutured muscle. After surgical wrapping procedure, left ventricular systolic pressure (LVSP) decreased from 109±21 to 93±16mmHg, max dp/dt from 761±211 to 642±234mmHg/sec, respectively (p<0.05) Left ventricular stroke volume (LVSV), maximum elastance of left ventricle (Emax) and peak flow of descending aorta (AOF) did not show any significant change. With synchronous contraction of latissimus dorsi muscle, LVSV increased clearly from 11.4±3.4 to 17.6±2.6ml (p<0.01), and AOF from 1.79±0.37 to 2.08±0.30l/min (p<0.05), respectively. Emax was also improved from 7.1±1.6 to 9.1±3.0mmHg/ml (p<0.05), while neither LVSP nor max dp/dt demon-strated any remarkable change. These studies suggest that: 1) synchronous con-traction of the sutured muscle is able to improve the cardiac function. 2) wrapping of the muscle may cause adverse hemodynamic effect to the native diseased heart.
