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目的：探讨胎儿出生前后左右心室收缩及舒张功能的变化。资料与方法：本文分析５０例正常妊娠胎儿２０～４０周左右心室房室瓣口舒张期血流的Ａ／Ｅ比值及主、肺动脉瓣口血流速度的变化，同时比较１４例足月妊娠与４１例出生后新生儿的左右心室舒张收缩功能变化。结果：正常妊娠时，随孕周的增加左右心室房室瓣口血流速度Ａ／Ｅ比值逐渐降低，主动脉及肺动脉瓣口收缩期血流峰速逐渐增加。胎儿出生后左心室舒张期房室瓣口血流速度Ａ／Ｅ比值明显下降，主动脉瓣口血流峰速明显增快；右心室房室瓣口血流及肺动脉瓣口血流速度无明显变化。结论：正常妊娠期左右心室的舒张功能及收缩功能随孕周增加逐渐加强，胎儿出生后左心室舒张功能及收缩功能明显加强，而右心室舒张功能及收缩功能无变化。
Objective: To investigate the changes of left ventricular systolic and diastolic function before and after birth. Materials and Methods: In this study, we analyzed the A / E ratio of diastolic blood flow and the changes of blood flow velocity in the main and pulmonary valves in 50 normal fetuses between 20 and 40 weeks, and compared 14 cases of full-term pregnancy with Changes of Left and Right Ventricular Diastolic Systolic Function in 41 Newborns after Birth. Results: In normal pregnancy, the A / E ratio of ventricular aortic valve velocity gradually decreased with the increase of gestational age, and the peak systolic velocity of aorta and pulmonary valve increased gradually. After birth, left ventricular diastolic left ventricular aortic valve blood flow velocity A / E ratio decreased significantly, aortic valve blood flow velocity was significantly increased; right ventricular aortic valve and pulmonary valve blood flow velocity no significant change . Conclusion: The left ventricular diastolic function and systolic function in normal pregnancy gradually increase with gestational weeks. The left ventricular diastolic function and systolic function obviously increase after birth, while the right ventricular diastolic function and systolic function have no change.