INFO:
一般输催产素半个小时之后会出现子宫收缩。如果宫颈条件不是很成熟，催产素可能没法诱导出有效的子宫收缩，可能是强度比较差的假性宫缩，并不能有效的打开宫口阴道分娩。所以催产素引产并不是100%成功，有的人宫颈成熟度比较差，可能一直不能诱发有效的子

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催产素打了多久有反应

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