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早产(preterm birth,PTB)是指妊娠满28周不足37周的分娩,是妊娠期最常见的并发症之一。早产占分娩总数的5%～10%,是导致围生儿发病率和死亡率升高的最主要因素,给家庭和社会带来了巨大的经济负担〔1〕。在美国,早产儿死亡占新生儿死亡总数的75%,而存活下来的早产儿多遗留各个系统
Preterm birth (PTB) refers to the delivery of less than 37 weeks of pregnancy at 28 weeks and is one of the most common complications during pregnancy. Premature birth accounts for 5% to 10% of the total number of deliveries, which is the most important factor leading to the increase of the morbidity and mortality of perinatal children, bringing huge economic burden to families and society [1]. In the United States, preterm births account for 75% of newborns’ deaths, while many of the surviving preterm infants are left behind