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产时延迟结扎脐带或挤压脐带能促进胎盘向新生儿输血,增加新生儿血容量,避免新生儿出生时因突然中断胎盘输血造成心脏前后负荷突然变化,使新生儿心血管系统分娩时平稳、生理性过渡~([1-3])。与足月儿相比,早产儿娩出后肺循环阻力更高,体循环压力上升更慢,动脉导管开放时间更长,左右心室要
Delayed delivery during the delivery of umbilical cord or umbilical cord can promote the placenta to neonatal blood transfusion to increase neonatal blood volume, avoid neonatal birth due to sudden interruption of placental blood transfusion caused by sudden changes in heart load before and after the neonatal cardiovascular system during delivery is stable, Physiological transition ~ ([1-3]). Compared with full-term infants, the pulmonary circulation after delivery of preterm infants with higher resistance, systemic pressure increased more slowly, the patent ductus arteriosus open longer, left ventricular