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目的:探讨经胸二维超声心动图2DTTE(Two-dimensional transthoracic echocardiography)、经食道二维超声心动图2DTEE(Two-dimensional transesophageal echocardiography)及经食道实时三维超声心动图RT3DTEE(Real-time three-dimensionaltransesophageal echocardiography)三种方法在测量房间隔缺损ASD(Atrial septal defect)最大内径