超声驻波作用时间对血液沉降的影响

Ultrasonic standing wave field has to do wilh erythrocyte sedimentation

目的 研究超声驻波不同作用时间对血液沉降过程的影响 .方法 对 14份血液样品用功率密度 =1.0 5 W·cm- 2的超声驻波场分别作用 0～ 2 0 0 s各不相等的时间 ,观察红细胞沉降现象并记录沉降指标 .结果 驻波场沉降曲线与自然沉降曲线有相似之处 ;驻波加速血沉的作用具有最小时间阈 ;存在驻波作用的“饱和时间”;一定条件下超声间歇作用于血样不会产生“时间累积效应”.

AIM To study the effect of different exposure time in the ultrasonic standing wave field (USWF) on the process of erythrocyte sedimentation. METHODS Erythrocyte sedimentation of 14 blood samples, which were continously or interruptedly exposed with the given USWF ( 1.76 MHz, 1.05 W·cm -2 ) for different time between 0 and 200 s, was investigated. RESULTS Ability of accelerating the sedimentation with USWF was related with the acoustic radiation time, and there existed a minimum threshold time T H and a saturation time T S; i.e., the USWF could accelerate the sedimentation only between the T H and T S. Moreover, we also found that the interrupted ultrasound could not cause an accumulative effect. CONCLUSION Extent of the effect of standing wave field on the sedimentation process is dependent on the exposure time.