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在全部分娩中,羊水粪染(meconium staining of the amniotic fluid,MSAF)约占11~22%,其中约2%可发生胎粪吸入综合征(meconium aspiration syndrome,MAS)。若发生MAS,围产死亡率可
In all deliveries, meconium staining of the amniotic fluid (MSAF) accounts for 11-22%, of which about 2% can develop meconium aspiration syndrome (MAS). In the event of MAS, perinatal mortality can be