Cinel D, Markwell K, Lee R, Szidon P
Department of Medicine, Rush Medical College, Chicago, Illinois.
Am Rev Respir Dis. 1991 Feb;143(2):217-8. doi: 10.1164/ajrccm/143.2.217.
The value of R, the respiratory gas exchange ratio, was determined in 70 unselected outpatients while undergoing arterial blood sampling as part of routine pulmonary function testing. We wished to determine whether acute changes in alveolar ventilation occurring during blood drawing were of sufficient magnitude to cause a significant error in the calculation of alveolar PO2 if the value of 0.80 for R was assumed. In the majority of subjects, R ranged from 0.70 to 0.90. In approximately 25% of the cases, the assumption of the value of 0.80 for R would have led to an error equal to or greater than 10 mm Hg in the estimation of the alveolar-arterial PO2 difference.
呼吸气体交换率R的值是在70名未经挑选的门诊患者进行动脉采血时测定的，这是常规肺功能测试的一部分。我们希望确定采血过程中发生的肺泡通气急性变化是否幅度足够大，以至于在假设R值为0.80的情况下，会在肺泡氧分压的计算中导致显著误差。在大多数受试者中，R值在0.70至0.90之间。在大约25%的病例中，假设R值为0.80会导致在估计肺泡-动脉氧分压差时产生等于或大于10 mmHg的误差。
