Abstract
Histrogical examination of inner surface of right ventricular pulsatile patch coatedd with Avcothane and interal organs of a goat, which survived 10 months after operation were carried out. Gross findings revealed no evident clots nor calcium deposi tes. In electron microscopic examination inner surface was covered with thin protein membrane with several masses of platelets 100 microns in maximum size. EPMA examination revealed no calcium or phosphorous elements within wall of patch. There were no pulmonary emboli in gross and microscopic findings. Slight cirrhotic changes were noted in liver.