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editorial
. 2023 Jan 26;61(1):2201962. doi: 10.1183/13993003.01962-2022

TABLE 1.

Mean (or mixed) alveolar to arterial gradients for oxygen (A̅aPO2) and arterial to mean alveolar gradients for CO2 (aA̅PCO2) in mmHg, intrapulmonary shunt (as % of total pulmonary blood flow) and alveolar dead space (as % of total alveolar ventilation) for different combinations of shunt and alveolar dead space

A̅aPO2 mmHg aA̅PCO2 mmHg Shunt % total blood flow Dead space % total ventilation
A Shunt only 48 2.3 30 0
B Dead space only 13 9.2 0 30
C Mixed: shunt = dead space 63 11.3 30 30
D Mixed: shunt >> dead space 63 7.5 44 10
E Mixed: dead space >> shunt 26 7.5 5 23

Calculated from figure 3b in Wagner et al. [3].