Objective To study the relation between placental pathologic changes and levels of maternal and umbilical serum nitric oxide (NO) in intrauterine growth retardation (IUGR).

• 目的了解胎儿宫内发育迟缓（IUGR）时胎盘病理改变与母血及脐血中一氧化氮（NO）水平的关系。