B. Contraindications to augmentation include placenta or vasa previa umbilical cord prolapse prior classical uterine incision pelvic structural deformities and invasive cervical cancer.

• 禁忌症包括前置胎盘或前置血管，脐带脱垂，既往古典式子宫切口，骨盆结构异常，和浸润性宫颈癌。