低钠血症是新生儿期比较常见的一种电解质紊乱。血浆钠<130mEq/L称为低钠血症。目前已很清楚,血浆钠浓度与细胞外液的渗透压有关,因为哺乳动物的细胞膜允许水自由通过,所以全部体液渗透压处于平衡状态。血浆钠的变化关系着水进出细胞。低钠血症时,水进入细胞(包括脑细胞),可引起神经系统症状和循环衰竭的表现。根据国内夏传雄等报道,围产期新生儿血浆钠值较成人为低。我科自1984年8月～1985年3月,对94例患儿做了血浆钠、钾和 Hyponatremia is a more common electrolyte imbalance in the neonatal period. Plasma sodium <130mEq / L is called hyponatremia. It is now clear that plasma sodium concentration correlates with the osmotic pressure of extracellular fluid, since the mammalian cell membrane allows water to pass freely, so all osmotic pressure is in equilibrium. Changes in plasma sodium are related to the movement of water in and out of cells. Hyponatremia, water into the cells (including brain cells), can cause neurological symptoms and circulatory failure performance. According to reports from China such as Xia Chuan-hsiung, plasma sodium in perinatal neonates is lower than that in adults. Our department from August 1984 to March 1985, made 94 cases of plasma sodium, potassium and