初产妇，30岁。急产娩一女婴，体重3800g, 胎盘娩出后半小时内有较多量间歇性阴道出血，色红，宫底，宫颈及肌肉已注催产素10单位，再次查看胎盘完整，胎膜有一处见血管中断于胎膜边缘，究其出血原因最可能是

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