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目的:探讨应用定量组织速度成像(QTVI)技术检测高血压患者左心房局部心肌舒缩时的机械运动特性。方法:对38例正常对照组及41例高血压患者行彩色多普勒超声心动图检查,采集左心房侧壁、房间隔壁基底段及中段心肌的组织多普勒二维图像,定量分析上述各节段心房心肌运动的速度曲线及心房壁心肌收缩的起始时间、达峰时间与结束时间。结果:(1)与正常对照组比较,高血压组相同房壁、相同节段心室收缩期心房峰值速度(VS)、心房收缩起始时间(PA-T1)和达峰时间(PA-T2)差异无统计学意义(P>0.05),心室舒张早期心房峰值速度(VE)及VE/VA值减低,心室舒张晚期心房峰值速度(VA)增加,心房收缩结束时间(PA-T3)、收缩加速时间(△T2-T1)、减速时间(△T3-T2)及整个收缩时间(△T3-T1)延长,差异有统计学意义(P<0.05或P<0.01)。(2)高血压组相同房壁、不同节段的VS、VE、VE/VA值及心肌收缩时间各项指标差异无统计学意义(P>0.05),VA差异有统计学意义(P<0.05或P<0.01)。结论:高血压患者左心房心肌收缩速度增加,收缩加速时间、减速时间及整个收缩时间延长;QTVI技术可定量、简便、无创评价高血压患者左心房局部的机械运动特性。
Objective: To explore the application of quantitative tissue velocity imaging (QTVI) technique to measure the mechanical characteristics of local left ventricular contraction and contraction in patients with essential hypertension. Methods: 38 cases of normal control group and 41 cases of hypertensive patients underwent color Doppler echocardiography, collecting the left atrial wall, atrial septal and middle myocardial tissue Doppler two-dimensional images quantitative analysis of the above Segmental atrial myocardial velocity curve and atrial myocardial contraction start time, peak time and end time. Results: (1) Compared with the normal control group, the atrial peak velocity (VS), PA-T1 and PA-T2 in the same segment of the same wall, (P> 0.05), decreased atrial peak velocity (VE) and VE / VA in early diastole, increased atrial peak velocity (VA) in late diastolic phase, accelerated atrial contraction time (PA-T3) The time (△ T2-T1), deceleration time (△ T3-T2) and the entire contraction time (△ T3-T1) were prolonged, the difference was statistically significant (P <0.05 or P <0.01). (2) The indexes of VS, VE, VE / VA and myocardial contractile time of the same wall and different segments in hypertensive group had no statistical significance (P> 0.05) Or P <0.01). CONCLUSIONS: Left ventricular myocardial systolic velocity increases, systolic acceleration time, decelerative time and total systolic time prolong in hypertensive patients. Quantitative, simple and noninvasive QTVI can be used to evaluate the local mechanical characteristics of left atrium in hypertensive patients.