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在常规氧疗情况下,采用简便方法正确评价血液的氧合状态,对于判断病情及指导治疗有重要临床意义。肺泡气—动脉血氧分压差[P_(A-a)O_2]是常用的判断肺内氧交换状态的指标。但其受吸入气氧浓度(FIO_2)的影响。FIO_2增加时P_(A-a)O_2随之增加,吸氧条件下很难确定正常值。临床上伴有气体交换障碍的病人多需用氧疗,因而其应用受到限制。虽然采用吸纯氧测P_(A-a)O_2的方法可克服上述影响,但要获
In the case of conventional oxygen therapy, a simple and convenient method to correctly evaluate the oxygenation state of the blood is of great clinical significance for judging the condition and guiding the treatment. Alveolar gas - arterial partial pressure of oxygen [P_ (A-a) O_2] is commonly used to determine indicators of lung oxygen exchange status. But it is affected by the FIO 2 concentration of inhaled gas. When FIO_2 increases, P_ (A-a) O_2 increases, and it is difficult to determine the normal value under the condition of oxygen. Clinically associated with gas exchange disorders need oxygen therapy, and its application is limited. Although the use of pure oxygen measurement P_ (A-a) O_2 method can overcome the above effects, but to be