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新生儿低氧血症是多种原因引起的。新生儿窒息、肺炎、早产儿呼吸窘迫、持续胎儿循环等多种疾病可引起肺小动脉不能正常扩张,导致肺血流阻力增加,肺动脉压力增高,卵圆孔和(或)动脉导管产生右向左分流,出现青紫。低氧可造成肺血管阻力增加,使受损的血管内皮合成内源性一氧化氮(n
Neonatal hypoxemia is caused by a variety of reasons. Neonatal asphyxia, pneumonia, respiratory distress in premature infants, persistent fetal circulation and other diseases can cause normal pulmonary arterioles can not be expanded, leading to increased pulmonary blood flow resistance, increased pulmonary artery pressure, foramen ovale and / or ductus Left shunt, appear bruising. Hypoxia can cause increased pulmonary vascular resistance, the damaged vascular endothelial synthesis of endogenous nitric oxide (n