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左心室大小和喷血比数是术前估计心脏病人功能的重要指标,但技术条件限制其在术后即期的常规应用。目前,用以测量这二项指标的左心室造影和通常所用的M—型超声心动图在监护室中都不能用作连续监测。为此,作者等研制了一种超声换能器。换能器为一密封、绝缘的超声晶体,术时如同临时起搏导线一样缝在心脏上,术后可经皮肤拔除,由于这种器件直接与心脏接触,可避免由于包扎而不能接触胸壁、机械辅助呼吸引起的肺过度充气、以及纵隔内积气和积血等影响超声能量抵达心脏的问题。动物实验经左胸第五肋间切口,以超声心动图作指引,将超声换能器安置在心脏的适当位置上,使左室壁心内膜和室间隔左面心内膜的超声图形均能显示出来,其通常位置是左心耳基部冠状动脉回
Left ventricular size and spurting ratio are important indicators of preoperative cardiac function, but technical conditions limit their routine application after surgery. Currently, left ventriculography and commonly used M-mode echocardiography, both of which measure these two measures, can not be used as a continuous monitor in the care unit. To this end, the author developed a kind of ultrasonic transducer. Transducer is a sealed, insulated ultrasound crystal, surgery as temporary pacing lead sewn on the heart, after surgery can be removed by the skin, due to direct contact with the heart of this device can be avoided due to bandaging and can not touch the chest wall, Mechanical assisted breathing caused by over-inflation of the lungs, as well as mediastinal pneumoperitoneum and hemorrhage affect the ultrasound energy to reach the heart. Animal experiments through the fifth left intercostal incision, with echocardiography as the guide, the ultrasound transducer placed in the appropriate position on the heart, so that left ventricular endocardium and left ventricular endocardial septal ultrasound images can be displayed Out, its usual location is left atrial appendage coronary artery back