Ishimaru S, Furuawka K, Takahashi M
Scand J Thorac Cardiovasc Surg. 1983;17(3):211-5. doi: 10.3109/14017438309099354.
The in vivo function of the convexo-concave Björk-Shiley prosthetic valve implanted in mitral position was evaluated with a simple cineradiographic procedure. The maximum opening angle of the tilting disc, calculated from the maximum and the minimum diameter of the radiopaque marker embedded in the disc when viewed elliptically, was 56 +/- 2 degrees and was not affected by tachycardia up to 160 beats per min. The time required for disc opening was almost the same as that for disc closure, and these times shortened in proportion to increase in pulse rate. Disc rotation, quick or slow, could be observed in all patients. Excellent function of the convexo-concave Björk-Shiley prosthesis was demonstrated by cineradiography. Any dysfunction of the disc opening is easily demonstrable, not only from measurement of the disc's maximum opening angle, but also from evaluation of the distance, on en face view, between the characteristic internal rim disc marker and the small strut delineating the small valve orifice when the disc is fully open.
采用一种简单的心血管造影术评估了植入二尖瓣位置的凸凹型Björk-Shiley人工瓣膜的体内功能。从椭圆形观察时，根据嵌入瓣膜的不透射线标记物的最大和最小直径计算得出的倾斜盘最大开口角度为56±2度，且不受高达每分钟160次心动过速的影响。盘片打开所需时间与关闭时间几乎相同，且这些时间随脉率增加成比例缩短。在所有患者中均可观察到盘片快速或缓慢旋转。心血管造影显示凸凹型Björk-Shiley人工瓣膜功能良好。不仅可以通过测量盘片的最大开口角度，还可以通过在正面视图中评估盘片完全打开时特征性内部边缘盘片标记与界定小瓣膜口的小支柱之间的距离，来轻松证明盘片打开的任何功能障碍。
