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由于双胎妊娠并发症率与死亡率大于单胎妊娠,超声识别双胎不仅重要而且可评估胎儿的健康状况。双胎妊娠时,每并发羊水容量过多,虽然单胎妊娠时羊水过多常提示多种母儿合并症,但双胎妊娠时则每属正常。从1983年1月至1984年12月加州医科大学共出生86例双胎,除外11例由于多种原因,未作超声检查者,尚有75例具备超声检查与出生纪录,羊水过多根据超声检查,以“胎体与子宫前壁完全分离”作为视诊诊断标准。子宫总容积通过测定子宫纵径与横径,75例中共计算55例。18例视诊判断羊水增多,其中15例计算了子宫总容积,3例因羊水显著过多,越出超声扫描的范围。胎膜早破的诊断标准是37孕周前强烈的宫缩伴胎膜破裂或宫颈的改变。由于作者重点为自发性早产,所以除外人工引产6例,其中重度畸胎4例,产妇
Because twin pregnancies have a greater complication rate and mortality than singleton pregnancies, identifying the twins by ultrasound is not only important but also evaluates the health of the fetus. Twin pregnancies, excessive amniotic fluid volume per concurrent, although singletonic polyhydramnios often prompted a variety of maternal complications, but the twin pregnancy is normal for each. From January 1983 to December 1984, a total of 86 twins were born in California Medical University. Except for 11 cases, ultrasound was not performed in 11 cases due to various reasons. There were 75 cases with ultrasound examination and birth record. According to ultrasound, Check to “complete separation of the carcass and the anterior wall of the uterus” as diagnostic criteria for the diagnosis. The total volume of the uterus by measuring the longitudinal and transverse diameters of the uterus, 75 cases calculated 55 cases of the CPC. 18 cases of diagnosis of amniotic fluid increased, of which 15 cases calculated the total volume of the uterus, 3 cases were significantly excessive because of amniotic fluid, ultrasound scan out of the range. The diagnostic criteria for premature rupture of membranes is a strong 37 weeks before pregnancy contractions with fetal membranes rupture or cervical changes. As the author focuses on spontaneous preterm labor, so except for labor induced abortion in 6 cases, of which 4 cases of severe teratogenicity, maternal