Abstract
Functional property of the Björk-Shiley prosthetic valve implanted in the mitral position of 38 patients (20 convexo-concave valve and 18 monostrut valve) was investigated by cineradiography. The maximum opening angle of the tilting disc was 58±2° of convexo-concave valve and 70±4° of monostrut valve, There was no change in the maximum opening angle, opening time and closing time of the disc observed during follow up period. It is noteworthy that the maximum tilting angle of the valve ring is over 10° in most case with the valve size of 31mm. This result suggest that choice of 31mm prosthetic valve is improper.