【摘要】 应用二维超声心动图和脉冲、彩色多普勒超声对86例正常胎儿心脏进行了解剖结构及血液动力学的检测。其检测成功率为:房室内径为91%(78/86),主动脉内径为93%(80/86),肺动脉内径为92%(79/86),二、三尖瓣环内径为86%(74/86)。主动脉血流为98%(84/86),肺动脉血流为91%(78/86),二、三尖瓣口血流为86%(74/86)。根据所测之数值分析,证实了胎儿期右心发育优势的理论,提示了心输出量的改变符合胎儿生长发育的需要,LACT/LVET 和 RACT/RVET 值的变化说明了体循环和肺循环阻力随着胎龄的增加而逐渐降低。更多还原

【Abstract】 The anatomical morphology and hemodynamics of 86 normal fetal hearts were observed by two—di- mensional eehocardiography and pulse and color Doppler ultrasonography.The methods of examination were briefly described and the successful rates of ex- amination was as follows:That of the internal diame- ters of the atrium and ventricle were 91%(78/86)and the aortic diameters were 93%(80/86),that of the in- ternal diameters of pulmonary arteries were 92%(79/ 86)and both the mitral and tricuspid rings were 86% (74/86).That of the blood flow velocities of the aorta were 98%(85/86),the pulmonary artery blood flow was 91%(78/86) and both the mitral and tricuspid blood flow were 86%(74/86).The data mentioned above verified the theory that the right heart grows superiorly in the fetal stage.The change of cardiac output conformed the needs of fetal growth and the changes of LVAT/LVET(left ventricular acceleration time/left ventricular ejection time)and RVAT/RVET (right ventricular acceleration time/right ventricular ejection time)values suggested that the resistance of the general and pulmonary circulations gradually de- clined with the advance of gestation.更多还原