摘要
目的 探讨 TCD中的脉动指数 (PI)与脑血管顺应性的关系。方法 利用经颅多普勒 (TCD)超声仪对大脑中动脉 (MCA)的最高血流速度 (Vs) ,最低血流速度 (Vd)及平均血流速度 (Vm)进行观察 ,然后求出脉动指数 (PI) ,即 PI=(Vs- Vd) / Vm。结果 通过临床上四组资料即正常组 (N) ,高血压组 (H) ,短暂性脑缺血发作组 (TIA)及脑梗死组 (CI)的 PI值分析发现 ,正常值 PI最小 ,随着病情加重 ,PI值逐渐加大 ,四组间两两比较P <0 .0 5。结论 PI可作为反映血管顺应性的良好指标 ,不仅能真实地反映血管顺应性同血管本身状况 (如痉挛、受压、狭窄及扩张 ) ,外周阻力及血流量间的密切关系 。
Objective This paper is to review the relationship between cerebrovascular compliance and pulsatility index(PI)value.Method The blood velocity of the middle cerebral artery(MCA) was observed with transcranial Doppler(TCD) in clinical research and then the PI value was calculated according to the formula:PI=(Vs-Vd)/Vm.(Vs is systolic peak flow,Vd is end diastolic peak flow.Vm is mean peak flow).Results Among four groups including normal(N).hypertension(HT).transient ischemic attack(TIA) and cerebral infarction(CI).the PI value was minimum in N group and increased with deterioration(P<0 05).Conclusion The PI value is a worthy index to reflect the arterial compliance,which not only reflects relationshop between arterial compliance and arterial condition(spasm,dilation,pressure,stenosis,etc),peripheral resistance and blood volume,but also can be used noninvasively in quantitation.
出处
《山西医药杂志》
CAS
2001年第1期18-20,共3页
Shanxi Medical Journal
关键词
经颅多普勒
脉动指数
动脉血管顺应性
脑缺血
Transcranial Doppler(TCD)
Pulsatility index(PI)
Arterial compliance
Ischemic cerebrovascular disease(ICVD)
Middle cerebral artery(M
