近端等流速面面积法测算二尖瓣狭窄之瓣口面积

Proximaliso┐velocitysurfaceareamethodforestimatingmitralorificeareainpatientswithmitralstenosis

近端等流速面面积（ＰＩＳＡ）法是根据近端血流汇聚（ＰＦＣ）原理，用彩色多普勒血流显像（ＣＤＦＭ）技术测定狭小孔径流量的一种新方法。本研究用ＰＩＳＡ法测算二尖瓣狭窄瓣口的面积（ｃＭ－ＶＡ）与手术标本实测值（ａＭＶＡ）相比较。结果表明，所有病人均可清晰显示二尖瓣口左房侧的ＰＦＣ区，ｃＭＶＡ与ａＭＶＡ具有良好的相关性。本研究证实了ＰＩＳＡ法估测二尖瓣口面积是可行，且精确的。

Theproximaliso-velocitysurfacearea(PISA)methodhasrecentlybeenproposedasanewapproachforquantificationofflowratethroughadiscretestenoticorificeusingcolorDopplerflowmapping(CDFM).Inthepresentstudy,PISAmethodwasappliedtocalculatemitralvalvearea(cMVA)inpatientswithmitralstenosisreferedformitralvalvereplacement,comparingwiththea-cutalsize(aMVA)obtainedfromoperatingspecimen.Itwasshownthatflowconvergenceregionsproximaltomitralvalveorfifceinleftatriumwereclearlydefinedinalpatients,andcMVAscorre-latedquitewelwithaMVAs(y=0.88x+0.02,r=0.91,P<0.001,SEE=0.2cm2).Inconclusion,itisclinicalyfeasibleandaccuratetousethePISAmethodforestimatingorificeareainpatientswithmitralstenosis.