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目的通过产前超声诊断探讨胎儿不同下腔静脉变异的发病率及变异的下腔静脉内径和血流峰速与正常下腔静脉相比是否有差异。方法回顾性分析37 448例行产前超声检查的胎儿资料,筛查出下腔静脉变异的病例,计算其发病率;比较变异组与正常组胎儿的下腔静脉内径及S波血流峰速有无差异。结果在所有受检胎儿中,左位下腔静脉54例(1.44‰),双下腔静脉14例(0.37‰)。正常胎儿下腔静脉内径为(2.71±0.42)mm,血流峰速为(36.25±6.30)cm/s;左位下腔静脉内径为(2.70±0.45)mm,血流峰速为(36.55±7.53)cm/s,与正常组相比差异均无统计学意义(t=6.78,P>0.05;t=3.56,P>0.05);双下腔静脉内径为(2.72±0.50)mm,血流峰速为(36.18±7.49)cm/s,与正常组相比差异均无统计学意义(t=10.43,P>0.05;t=7.01,P>0.05)。结论左位下腔静脉发病率为1.44‰,双下腔静脉发病率为0.37‰,两种变异的下腔静脉内径和血流峰速与正常组相比无明显差异。
OBJECTIVE: To investigate whether there is a difference between the incidence of varicose veins and the variation of inferior vena cava diameter and peak velocity in normal fetuses by prenatal ultrasound. Methods A retrospective analysis of 37 448 fetuses with prenatal ultrasound was performed to screen out the variations of IVC and calculate the incidence. The diameter of IVC and the peak S wave velocity were compared between the variant group and the normal fetus Is there any difference? Results In all fetuses, 54 cases (1.44 ‰) of the left inferior vena cava and 14 cases (0.37 ‰) of the double inferior vena cava were found. The diameter of inferior vena cava in the left fetus was (2.70 ± 0.45) mm and the peak velocity of blood flow was (36.55 ±) (T = 6.78, P> 0.05; t = 3.56, P> 0.05). The diameter of the double inferior vena cava was (2.72 ± 0.50) mm and the blood flow was significantly lower than that of the normal group The peak velocity was (36.18 ± 7.49) cm / s, with no significant difference compared with the normal group (t = 10.43, P> 0.05; t = 7.01, P> 0.05). Conclusion The incidence of inferior vena cava on the left side is 1.44 ‰ and the incidence of double inferior vena cava is 0.37 ‰. There is no significant difference between the two kinds of variations in the diameter and peak velocity of IVC and normal blood flow.