彩色多普勒血流会聚法评估动脉导管未闭分流程度

Estimation of Shunt Severity of Patent Ductus Arteriosus by Color Doppler Flow Convergence Region

用彩色多普勒血流会聚法对２０例动脉导管未闭患者的左向右分流率Ｆ进行测定，并根据Ｆ值计算出动脉导管的横截面积Ａ。结果表明，血流会聚法所测分流率Ｆ与频谱Ｄｏｐｐｌｅｒ法所测的分流量Ｑｐ－Ｑｓ、Ｑｐ／Ｑｓ以及导管两端的压差△Ｐ和左室内径ＤＬＶ之间均具有很好的相关性（ｒ分别为０．８１，０．６２，０．６９和０．５３，Ｐ值分别小于０．００１，０．００５，０．００１和０．０１）。根据Ｆ值计算出的导管横截面积Ａ与两组切面上直接测得的导管内径Ｄｄ也具有极好的相关关系（ｒ＝０．８１，Ｐ值＜０．００１）。Ｑｐ／Ｑｓ≥２１所对应的Ｆ值明显高于Ｑｐ／Ｑｓ＜２１所对应的Ｆ值（Ｐ值＜０．００５）。彩色多普勒血流会聚法能够较为快速。

he left to right shunt rate(F) and the transverse sectional area of ductus arteriosus(A) were calculated by color Doppler flow convergence method in 20 patients with patent ductus arteriosus. The results indicated that the shunt rate(F) was correlated fairly with Qp-Qs, Qp/Qs(measured by pulsed wave Doppler), the pressure gradient (△P) and the diameter of left ventricle(D LV )(r=0.81, 0.62, 0.69 and 0.53; P<0.001, 0.005, 0.001 and 0.01, respectively). The transverse sectional area of ductus arteriosus(A) was also correlated closely with the diameter of ductus arteriosus(Dd) measured directly in two-dimensional view (r=0.81, P<0.001). The F value of group Qp/Qs≥2∶1 was apparently higher than that of group Qp/Qs<2∶1(P<0.005). The color Doppler flow convergence method can rapidly and exactly evaluate the left to right shunt severity of patent ductus arteriosus.