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Assessment of Mitral Regurgitation in Dogs by Color Doppler Echocardiography

應用彩色都卜勒心臟超音波評估犬僧帽瓣擾流之研究

摘要


本研究的目的在於利用彩色都卜勒心臟超音波(color Doppler echocardiography) 來評估犬隻僧帽瓣擾流(mitral regurgitation, MR)的嚴重程度,並將所得結果與參考紐約心臟協會(NYHA)之心臟功能分級表所做出的疾病分級做相關性比較。此次研究共收集了46隻(14隻母犬,32隻公犬) 3到14歲,平均年齡8. 7歲,患有僧帽瓣擾流的犬隻。研究分析下列兩組參數:(1)擾流面積(RJA)、左心房面積(LAA)及擾流佔左心房面積百分比(RJA/LAA);(2)擾流口之近側擾流寬度(Rw)、僧帽環直徑(MAD)及擾流寬度佔僧帽環直徑比例(Rw/MAD)。在這兩組參數中,與疾病分級有最佳相關性的是擾流佔左心房面積百分比,其相關係數為0.91。利用本次研究所使用的超音波儀及其設定,可以得到兩個分別為25%和50%的擾流佔左心房面積百分比臨界值以區分輕微、中度及嚴重程度的僧帽瓣擾流。因此,從這個研究的結果得知,擾流佔左心房面積百分比可以作為應用彩色都卜勒評估犬僧帽瓣擾流嚴重程度之半定量研究方法的良好參數。

並列摘要


The purpose of this study was to evaluate the severity of mitral regurgitation (MR) by color Doppler echocardiography, and compare the obtained results with the data of modified New York Heart Association (NYHA) functional classification scheme. The study was performed on 46 dogs (14 female, 32 male) with mitral regurgitation. Their ages ranged 3-14 years, with the mean age was 8.7 years. Two sets of parameters were investigated, including: (1) regurgitant jet area (RJA), left atrial area (LAA) and the ratio of RJA and LAA; (2) proximal width of regurgitant jet (Rw), diameter of mitral annulus (MAD) and the ratio of Rw and MAD. Of these parameters, the best correlation was obtained from RJA/LAA (r = 0.91), determined in the apical plane where the jet was best visualized. With our instrumentation, the ”cutoff” values in dogs separating mild, moderate and severe MR appear to be 25% and 50% for RJA/ LAA. This parameter, therefore, represents a useful method for estimating semiquantitatively the severity of mitral regurgitation by color Doppler echocardiography.

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