TABLE 1

Change in diffusing capacity and gas exchange parameters after lung volume reduction (LVR) treatment

ParameterStudies nPatients nBefore LVRAfter LVRDifference
DLCO % predicted41186435.641.3+5.7
PaO2 kPa3513758.729.36+0.64
PaCO2 kPa3513755.535.22−0.31
PA–aO2 kPa3614084.234.05−0.18

DLCO: diffusing capacity of the lung for carbon monoxide; PaO2: arterial oxygen tension; PaCO2: arterial carbon dioxide tension; PA–aO2: alveolar–arterial oxygen tension difference (alveolar–arterial oxygen gradient).