Purpose To establish normative reference ranges of fetal azygos vein between gestation 20.0 and 40.0 weeks and analyze the possible correlation between azygos vein diameter and gestational age.Materials and Methods Retrospectively analyzed the data which collected from pregnant women with singleton pregnancies,1375 fetuses with normal outcome were included.The gestation was from 20.0 weeks to 40.0 weeks.The research objects were divided into 5 groups according to their gestational age and were examined standardized.The fetal normal reference value of azygos vein and its correlation with gestational ages were analyzed.Results The normal reference value of the fetal azygos vein diameter was established.We found that a significant increase linear between the diameter of fetal azygos vein and the gestation age.There was no obvious correlation with sex.The ratio of azygos vein and descending aorta inner diameter was about 0.36.There was on obvious changes in different gestational ages.Conclusions Fetal echocardiography technology can accurately assess fetal cardiac structure,the establishment normal reference value of azygos vein diameter could provide guidance for fetal echocardiography examination.%目的 通过超声心动图检查,对20.0～40.0周正常胎儿奇静脉内径进行正常参考值调查,探讨不同孕龄的参数的变化规律.资料与方法 回顾性分析1375例胎儿超声心动图检查资料,均为单胎,孕20.0～40.0周.根据孕周将研究对象分5组,并分别对所有受检胎儿进行规范化检查,分析胎儿奇静脉内径正常参考值范围并研究其与孕龄的关系.结果 孕20.0～40.0周胎儿奇静脉内径与孕周呈显著线性相关(r=0.879,P＜0.05),与性别无明显相关(P＞0.05).奇静脉与降主动脉内径的比值约为0.36,不同孕周无明显改变.结论 胎儿超声心动图技术能够准确评价胎儿心脏结构,各孕龄奇静脉正常值的制订能够为胎儿超声心动图的正确诊断提供辅助作用.
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