The coronary peak velocity(CPV)and the velocity time integral(VTI)in left anterior descending arterial flow were measured during dipyridamole induced hyperemia under control conditions and each grade of acute AR.

• 记录各返流程度的舒张期血流速度峰值 ( CPV)、加速时间 ( AT)、减速时间 ( DT)和全心动周期的速度时间积分 ( VTI)及动脉舒张压 ( DBP)。 然后在各种状态下经股静脉匀速推注潘生丁 ( 2 .；0 mg/kg)；2分钟推完；记录各组每分钟冠脉血流的 CPV和 VTI;