应用血流向量成像技术观察心肌梗死患者左心室舒张期血流状态

目的应用血流向量成像技术(VFM)观察心肌梗死患者左心室舒张期血流状态的变化规律。方法选取36名健康志愿者(健康对照组)和39例左心室前壁心肌梗死患者(心肌梗死组)作为观察对象,获得其左心室血流向量成像图像,分析其舒张期不同时相涡流特征并比较两组的定量参数。结果健康对照组在等容舒张期未见明显涡流图像,舒张早期和晚期在二尖瓣前后叶下方可见2个较小且对称的涡流,舒张中期显示充盈左心室腔较大的整体涡流。心肌梗死组在舒张期各时相的涡流变化规律与健康对照组相似,但舒张早期、晚期的二尖瓣下涡流横径、纵径均大于健康对照组,差异有统计学意义(33.42±6.77)mmvs(24.53±4.73)mm,(41.50±5.87)mmvs(25.55±4.72)mm,t=12.916、23.248,P均<0.05)];舒张早期、中期、晚期涡流横向距离和纵向距离均大于健康对照组,差异有统计学意义(20.60±4.60)mmvs(13.23±4.25)mm,(28.65±3.75)mmvs(15.20±4.38)mm,(17.70±3.79)mmvs(12.59±4.20),(40.93±7.33)mmvs(26.13±4.83)mm,(51.69±11.41)mmvs(22.84±4.52)mm,(36.00±8.25)mmvs(21.50±3.59)mm,t=9.618、18.528、13.336、17.266、36.805、27.528,P均<0.05)]。心肌梗死组舒张期各时相涡强度均大于健康对照组,差异有统计学意义(24.71±5.24)/svs(15.18±4.39)/s,(19.33±3.67)/svs(11.23±3.53)/s,(33.42±5.38)/svs(21.17±6.32)/s,t=8.542、10.358、9.751,P均<0.05)],而最大向量速度与健康对照组差异无统计学意义。结论 VFM可显示心肌梗死患者左心室舒张期血流状态的变化,并可对涡流的特点作定量分析。

Evaluation of left ventricular diastolic vortex in myocardial infarction patients by vector flow mapping

Objective To evaluate the left ventricular diastolic vortex in myocardial infarction patients by vector flow mapping(VFM) with Doppler echocardiography. Methods Thirty-nine myocardial infarction patients(infarction group) and 36 healthy volunteers(control group) were choosen in the study. The color images in three sequent cardiac cycles were obtained and analyzed by VFM. Quantitative parameters including vortex diameter, vortex position, maximum velocity and vortex intensity were compared between the two gr...