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目的：研究高原肺水肿的发生与血浆一氧化氮（ Ｎ Ｏ） 、一氧化氮合成酶（ Ｎ Ｏ Ｓ） 和心钠素（ Ａ Ｎ Ｐ） 的关系。方法：在海拔３ ７００ｍ 对１１ 例高原肺水肿患者在治疗前和治愈后分别检测其血浆 Ｎ Ｏ、 Ｎ Ｏ Ｓ和 Ａ Ｎ Ｐ含量，并与初入海拔３ ７００ ｍ 的１０ 名健康青年作对照。结果：高原肺水肿组 Ｎ Ｏ 治愈后较治疗前增高非常显著（ Ｐ＜ ０ ．０１） ， Ａ Ｎ Ｐ 降低非常显著（ Ｐ＜ ０ ．０１） ， Ｎ Ｏ Ｓ 无显著性差异（ Ｐ＞ ０ ．０５） ；治愈后 Ｎ Ｏ 和 Ａ Ｎ Ｐ显著低于健康青年组（ Ｐ＜ ０ ．０５） ，治疗前较健康青年 Ｎ Ｏ、 Ｎ Ｏ Ｓ降低非常显著（ Ｐ＜ ０ ．０１） ， Ａ Ｎ Ｐ 增高显著（ Ｐ＜ ０ ．０５） 。治疗前血浆 Ｎ Ｏ 含量与 Ｎ Ｏ Ｓ 活性呈高度正相关（ｒ＝ ０ ．８６４６ ， Ｐ＜ ０ ．０１） 。结论：血浆 Ｎ Ｏ、 Ｎ Ｏ Ｓ和 Ａ Ｎ Ｐ均参与了高原肺水肿的病理生理过程，血浆 Ａ Ｎ Ｐ含量升高可能是机体的一种保护性代偿机制。
Objective: To study the relationship between the occurrence of altitude pulmonary edema and plasma levels of nitric oxide (NO), nitric oxide synthase (N O S) and atrial natriuretic peptide (A N P). Methods: Eleven patients with pulmonary edema at altitude of 3 700 m were examined for plasma N O, N O S and A N P before and after treatment, and compared with 10 healthy young people . Results: The N0 O in high altitude pulmonary edema group was significantly higher than that before treatment (P <0.01), and the A N P decrease was significant (P <0.01). There was no significant difference in N O S between the two groups (P> 0.05). (P0.05) .N O and N O S decreased significantly (P <0.01) before treatment compared with that of healthy youth Increase significantly (P <0 .05). The plasma N O level before treatment was positively correlated with NOS activity (r = 0.8664, P <0.01). Conclusion: Plasma N O, N O S and A N P are both involved in the pathophysiological process of high altitude pulmonary edema. Increased plasma N-P may be a protective compensatory mechanism.