初产妇，39周，估计胎儿体重3800g。临产 16小时，倉口开大2cm，以5%葡萄糖、缩 宫素2.5U静脉点滴。4小时后宫口开大 9cm,但产妇烦躁不安，疼痛难忍。腹部检 査，脐下两指处呈环状凹陷，下段有压痛， 胎心正常，导尿呈血性。可能的诊断是(       )

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