Espino-Vela J, Bobadilla-Aguirre A, Muñoz-Hernández G, Reyes-Rodríguez S, Meraz-Campillo J, Sáenz-Arroyo L
Instituto Nacional de Pediatría, Universidad Autónoma Metropolitana, (Iztapalapa).
Arch Invest Med (Mex). 1990 Apr-Jun;21(2):145-53.
Transvalvular turbulence caused by the blood flow in implanted cardiac valvular prosthesis is the cause of thrombosis at the post-valvular region. The literature in this connection indicates that thromboembolic complications are more common with the tilting disc mechanical valves. In order to study the turbulence caused by porcine biological prosthetic valves, by a caged-ball Biomed mechanical valve and by a tilting disc Björk-Shiley valve, a device was developed which permits to visualize and to photograph flow characteristics in the three types of valves with the purpose of determining the degree of turbulence generated in each case. An additional accessory equipment was devised for the purpose of measuring static and dynamic pressures at various levels of the test tube containing the prosthetic valve wherein the variations in pressure reflect the degree of turbulence. The data obtained from 500 pressure registrations were analyzed in a computer. The data indicate that the porcine biological valve causes the least turbulence, whereas the mechanical valves create greater turbulence. Of the mechanical valves, the tilting disc prosthetic valve causes considerably greater turbulence, in particular in the vicinity of the smaller orifice.
植入式心脏瓣膜假体中的血流所引起的跨瓣膜湍流是瓣膜后区域血栓形成的原因。这方面的文献表明，血栓栓塞并发症在倾斜盘式机械瓣膜中更为常见。为了研究猪生物瓣膜、笼球式生物医学机械瓣膜和倾斜盘式 Björk-Shiley 瓣膜所引起的湍流，开发了一种装置，该装置能够可视化并拍摄这三种瓣膜中的血流特性，目的是确定每种情况下产生的湍流程度。还设计了一种额外的辅助设备，用于测量装有假体瓣膜的试管不同高度处的静态和动态压力，其中压力变化反映了湍流程度。从 500 次压力记录中获得的数据在计算机中进行了分析。数据表明，猪生物瓣膜引起的湍流最小，而机械瓣膜产生的湍流更大。在机械瓣膜中，倾斜盘式假体瓣膜引起的湍流要大得多，特别是在较小孔口附近。
