Objective To evaluate the accuracy of detecting high degree stenosis of proximal or mid-left anterior descending coronary artery(LAD) by transthoracic Doppler echocardiography(TTDE).
目的评价经胸多普勒超声心动图技术（TTDE）检测冠状动脉左前降支近、中段高度狭窄的准确性。
These cross sections of the left anterior descending coronary artery demonstrate more pronounced atherosclerosis with narrowing at the left, which is the proximal portion of this artery.
从左到右依次排列着粥样硬化的左冠状动脉的前降支从近端到远端的横断面，左边的近端冠状动脉内腔更狭窄，粥样硬化更严重。
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