某产妇,产程进展顺利,经阴道分娩一男婴,体重4050克。胎儿娩出后阴道流血500ml,色鲜红,可自凝,宫底脐下三横指。此时首先考虑的出血原因是
A.宫缩乏力
B.胎盘嵌顿
C.宫颈裂伤
D.凝血功能障碍
正确答案是C
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