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目的探讨多普勒组织成像(DTI)评价扩张型心肌病(DCM)患者右心室收缩功能的价值。方法应用DTI检测了28例DCM患者和30例正常人三尖瓣环处射血期波(S)峰值速度(Vs)、速度时间积分(VTIs)、持续时间(Ts)、心电图Q波至S波起点处间期(Q-S)等,并与二维超声心动图所测三切面平均右心室面积变化率(MRVPCA)、胸骨旁左心长轴切面所测右心室前后径(RVD)等对比分析。结果DCM患者三尖瓣环处Vs、VTIs均较对照组明显减低(P<0.05),Q-S间期延长(P<0.01),Q-S/Ts比值增大(P<0.01),MRVPCA减小(P<0.01),RVD增大(P<0.01),右心室面积两组无明显差异(P>0.05)。结论DCM患者右心室收缩功能存在一定程度减退,应用三尖瓣环处DTI所测收缩期运动指标,可对其进行正确评价。
Objective To evaluate the value of Doppler tissue imaging (DTI) in evaluating right ventricular systolic function in patients with dilated cardiomyopathy (DCM). Methods DTI was used to detect peak wave velocity (Vs), velocity time integral (VTIs), duration (Ts), and Q wave of electrocardiogram (Q wave) in tricuspid annulus of 28 DCM patients and 30 healthy controls (QS) and so on, and compared with two-dimensional echocardiography measured three-section average right ventricular area change rate (MRVPCA), left ventricular parasternal left ventricular long axis measured right ventricular diameter (RVD) comparative analysis . Results The Vs and VTIs of tricuspid annulus in DCM patients were significantly lower than those in control group (P <0.05), QS interval was prolonged (P <0.01), QS / Ts ratio was increased <0.01), RVD increased (P <0.01), there was no significant difference between right ventricular area and control group (P> 0.05). Conclusions The right ventricular systolic function in patients with DCM has a certain degree of diminution. The systolic motor index measured by DTI at the tricuspid annulus can be correctly evaluated.