低O_2低CO_2是人在高原上一个最常见的生理现象,动脉血液中CO_2分压(PaCO_2)的高低是调节脑血流的最重要的因素.早在1965年,Harper等已对常O_2下PaCO_2与脑血流的关系作过较系统的研究.后来,又有不少国内外的学者,如顾正中,Krasney等就低O_2下PaCO_2与脑血流的关系问题作了一些研究.他们观察到高PaCO_2可以加强低O_2的升血流效应,引起脑血流的叠加反应;而低PaCO_2则有对抗低O_2的升血流作用,使低O_2下 Low O_2 Low CO_2 is one of the most common physiological phenomena on the plateau, and the most important factor in the regulation of cerebral blood flow is arterial blood CO 2 partial pressure (PaCO_2). As early as 1965, Harper et al. PaCO_2 and cerebral blood flow for a more systematic study later, there are many domestic and foreign scholars, such as Guzhong, Krasney et al on low O_2 PaCO_2 and cerebral blood flow relationship made some research they observed PaCO_2 up to high can enhance the blood flow of low O_2 effect, causing a superimposed reaction of cerebral blood flow; and low PaCO_2 have anti-low O_2 of blood flow, so that low O_2