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急性心肌缺血可使心室壁局限性收缩障碍,在M型超声心动图上表现为室壁收缩期节段性变薄及局部隆起。但M型超声波所观察到的左心室部分较小而B型超声仪检查面积大且可作多种断层的切面,因此国外已逐步选用B型超声波诊断冠心病。动物实验发现,局部心肌供血减少30％时出现收缩期节段性室壁运动异常,而且心內膜面较外膜面的损伤更为明显。
Acute myocardial ischemia can limit the contraction of the ventricular wall disorders, M-mode echocardiography showed segmental ventricular wall thinning and local uplift. However, M-mode ultrasound is observed in the small part of the left ventricle and B-mode ultrasound examination of a large area and can be used for a variety of slices of the section, so foreign countries have gradually chosen B ultrasound diagnosis of coronary heart disease. Animal experiments found that when the local myocardial blood supply decreased by 30% systolic segmental wall motion abnormalities, and more obvious damage to the outer membrane surface of the endocardial surface.