英语语法分析

There has been a previous extensive transmural myocardial infarction involving the free wall of the left ventricle.

左心室壁见大片陈旧性透壁性梗死。

Except that pneumatosis was only seen in transmural infarction, all the abnormal CT findings were found in different patterns and different degrees of ischemia.

只见于全层坏死的征象是肠壁积气，其他征象均可见于不同病因、不同程度的肠缺血。

Objective To explore the practicability of real-time myocardial contrast echocardiography (MCE) in assessing the transmural distribution of myocardial perfusion.

目的探讨实时心肌造影超声心动图(MCE)评价心肌灌注跨壁分布的可行性。