脐带脱垂(prolapse of cord) 当胎膜破裂，脐带脱出于胎先露部下方，经宫颈进入阴道内，甚至经阴道显露于外阴部。脐带先露(presentation of umbilical cord)又称隐性脐带脱垂，指胎膜未破时脐带位于胎先露部前方或一侧。其发生率为...
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