目的探讨超声心动描记术估测左心室做功量和机械效率的新指标。
Objective To establish noninvasive new indices for the evaluation of left ventricular (LV) work and mechanical efficiency.
目的比较经胸超声心动描记术（TTE）和经食管超声心动描记术（TEE）评价房颤栓塞危险性的价值。
Objective To compare the value of estimating embolic risk in atrial fibrillation between the two methods: transthoracic echocardiography (TTE) and transesophageal echocardiography (TEE).
目的：探讨术中经食管超声心动图描记术（ITEE）的临床应用价值。
Objective:To evaluate the clinical significance of intraoperative transesophageal echocardiography (ITEE).
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