缺血性和非缺血性心肌病功能性二尖瓣反流的超声心动图决定因素不同  

The echocardiographic determinants of functional mitral regurgitation differ in ischemic and non-ischemic cardiomyopathy

作　　者：Nagasaki M. Nishimura S. Ohtaki E. 韩瑞娟(译) 任付先(校) 

机构地区：[1]不详 [2]Sakakibara Heart Institute, Cardiology, 3- 16-1 Asahi-Cho, Fuchu City Tokyo 183 -0003, Japan

出　　处：《世界核心医学期刊文摘（心脏病学分册）》2006年第8期41-42,共2页

摘　　要：Background: Functional mitral regurgitation(MR) is one of the common and severe complications in patients with dilated cardiomyopathy. The detailed mechanisms that cause functional MR remain to be elucidated. Using two-dimensional transthoracic echocardiography, we inves- tigated the differences in major determinants of MR severity between ischemic cardiomyopathy(ICM) and non-ICM patients. Methods: We enrolled 103 patients(91 males; age 64± 12 years) with significant left ventricular(LV) dilatation. They were divided into ICM group(n=69) with significant coronary disease, and non-ICM(n=34) group without coronary disease. We devised a novel and simple parameter; the short-axis sphericity index(SI), to evaluate global LV remodeling, and used coaptation depth(CD) and tenting area(TA) to evaluate mitral deformity. Results: In all cases, CD, TA and left atrium diameter(LAD) correlated positively with maximum regurgitation area(MRA)(r=0.54, 0.57, 0.57; P< 0.0001). A negative correlation was observed between MRA and SI(r=-0.33, P=0.0008). There was no significant relationship between MRA and LV ejection fraction(EF). In non-ICM cases, SI tended to be lower with reduced EF.Multivariate stepwise linear regression analysis showed the following equations; ICM: MRA=-9.4 + 0.81CD + 0.21LAD(r2=0.47, P< 0.0001), non-ICM: MRA=-7.2 + 0.17LVDs(LV end systolic diameter)-8.7SI + 0.27LAD(r2=0.63, P< 0.0001). Conclusions: The strongest determinants of functional MR severity differ in ICM and non-ICM. While LV diameter and SI(global LV remodeling index) mainly determine the severity in non-ICM, CD that reflects mitral deformity is the major determinant in ICM.Background： Functional mitral regurgitation（MR） is one of the common and severe complications in patients with dilated cardiomyopathy. The detailed mechanisms that cause functional MR remain to be elucidated. Using two-dimensional transthoracic echocardiography, we investigated the differences in major determinants of MR severity between ischemic cardiomyopathy（ICM） and non-ICM patients. Methods： We enrolled 103 patients（91 males; age 64± 12 years） with significant left ventricular（LV） dilatation. They were divided into ICM group（n =69） with significant coronary disease, and non-ICM（n =34） group without coronary disease. We devised a novel and simple parameter; the short-axis sphericity index（SI）, to evaluate global LV remodeling, and used coaptation depth （CD） and tenting area（TA） to evaluate mitral deformity. Results： In all cases, CD, TA and left atrium diameter（LAD） correlated positively with maximum regurgitation area（MRA） （r=0.54, 0.57, 0.57; P 〈0.0001）. A negative correlation was observed between MRA and SI（r = -0. 33, P = 0. 0008） . There was no significant relationship between MRA and LV ejection fraction（EF）. In non-ICM cases, SI tended to be lower with reduced EF. Multivariate stepwise linear regression analysis showed the following equations; ICM： MRA=-9.4 ＋0.81CD ＋ 0.21LAD（r2=0.47, P 〈0.0001）, non-ICM： MRA= -7.2 ＋ 0.17LVDs（LV end systolic diameter） -8.7SI ＋0. 27LAD（r2 =0. 63, P 〈 0. 0001 ） . Conclusions： The strongest determinants of functional MR severity differ in ICM and non-ICM. While LV diameter and SI（global LV remodeling index） mainly determine the severity in non-ICM, CD that reflects mitral deformity is the major determinant in ICM.

关 键 词：经胸二维超声心动图 非缺血性心肌病 二尖瓣反流 功能性 扩张型心肌病患者 左心室重构 左心室射血分数 线性回归分析 ICM 球形指数 

分 类 号：R540.45[医药卫生—心血管疾病] R541.6[医药卫生—内科学]