双门深经颅多普勒检测机械心瓣膜患者微栓子信号的研究

Study on microembolic signals using bigated transcranial Doppler in patients with mechnical heart valve

目的 :研究脑动脉微栓子信号 (MES)的基本特征。方法 :采用双门深经颅多普勒 (TCD)检测了 2 1例机械心瓣膜患者的脑动脉 MES。结果 :MES阳性发现率为 80 .95 % (17/ 2 1) ,MES出现频率为 0～ 40 4(中位数 40 )个 /小时 ,MES相对强度为11～ 38(2 3.6 3± 5 .13) d B。84.89%的 MES在二个取样深度依次显示 ,时间延迟为 0 .4～ 2 8.4(中位数 6 .0 ) m s,15 .11% MES仅见于近端通道 ,而在远端通道未能显示。结论 :双门深 TCD是研究

Objective: To study the basic characteristics of cerebral arterial microembolic signals (MES) Method: The MES were detected using bigated transcranial Doppler (TCD) in 21 patients with mechanical heart valve Results: MES were detected in 80 95%(17/21) patients MES frequency was 0~404 (median 40)/hour MES relative intensity was 11~38(23 63±5 13) dB 84 89% MES were detected in both channels The time was delayed 0 4~28 4(median 6 0) ms 15 11% MES were only seen in proximal channel but not in distal channel Conclusion: Bigated TCD is a valuable way to study the basic characteristics of MES