METHODS: CVR were measured with 99m TC radiolabelled frog RBC, the changes of NO - 2,ET-1 contents, nitric oxide synthase(NOS) activity and the myocardial morphometry were observed.

• 慢性低氧组。 分别测量心肌血流量、血浆和心肌NO-2 、内皮素 - 1(ET- 1)含量、心肌一氧化氮合酶 (NOS)活性产并观察心肌血管结构改变。