Objective To assess regional left ventricular systolic function in patients with hypertrophic cardiomyopathy (HCM) using real-time three-dimensional echocardiography (RT-3DE).Methods Twenty-five patients with HCM which was asymmetric septal hypertrophy,and twenty healthy subjects were enrolled in the study.The apical four-chamber view of left ventricular was acquired by RT-3DE.The left ventricular volume-time curves were analyzed quantitatively with Tomtec 4D LV-Analysis 3.0,and regional end-diastolic volume and end-systolic volume of left ventricular (rEDV,rESV),the time to minimum systolic volume (rESVT),regional stroke volume (rSV),regional ejection fraction (rEF),regional-global ejection fraction (rgEF) and the parameters of left ventricular dyssynchrony were measured.Results In the HCM group,the values of Tmsv16-Dif,Tmsv16-SD,Tmsv16-Dif％,Tmsv16-SD％ were significantly lower compared with the control group (P ＜ 0.01),and rEDV,rSV,rEF and rgEF in hypertrophic segments were lower than those in non-thickening and mild-thickening segments (P ＜0.05).In the control group,there were no significant difference of those parameters among all segments (P ＞0.05).The values of rEDV,rSV and rgEF in hypertrophic segments decreased in the HCM group (P ＜0.05),at the basal level,rEF in hypertrophic segments decreased,at the apical level,it increased,but the differences at the mid-ventricular level between the two groups were not significant;the values of rEF and rgEF in non-thickening and mild-thickening segments increased (P ＜0.05).Conclusions RT-3DE could sensitively detect left ventricular dyssynchrony and accurately assess regional left ventricular volume and function of different segments in patients with HCM.%目的 应用实时三维超声心动图(RT-3DE)技术评价肥厚型心肌病(HCM)患者左心室节段容积及收缩功能.方法 选取25例室间隔肥厚型非对称性HCM患者、20例正常人行三维容积成像,应用Tomtec 4D LV-Analysis 3.0软件描绘左室16节段容积-时间曲线,记录节段舒张末期容积(rEDV)及收缩末期容积(rESV)、达收缩末期最小容积时间(rESVT),计算节段每搏量(rSV)、节段射血分数(rEF)、左室节段-整体射血分数(rgEF)及左室收缩同步性参数.结果 HCM组Tmsv16-Dif、Tmsv16-SD、Tmsv16-Dif％、Tmsv16-SD％均明显高于正常组(P＜0.01).HCM组肥厚节段rEDV、rSV、rEF及rgEF均低于相应水平非肥厚及轻度肥厚节段(P＜0.05)；正常组各节段参数差异均无统计学意义(P＞0.05).与正常组相应节段比较,HCM组肥厚节段rEDV、rSV、rgEF减低(P＜0.05),而rEF值在基底水平减低,心尖水平增高,乳头肌水平差异无统计学意义(P＞0.05)；非肥厚及轻度肥厚节段rEF、rgEF较正常组增高(P＜0.05).结论 RT-3DE可以敏感检测出HCM患者左室收缩不同步,准确反映左室节段容积及收缩功能的异常改变,为临床早期评估HCM左室收缩功能提供了一种量化方法.
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