Source of Support: None, Conflict of Interest: None
In 123 stable patients with chronic bronchitis, three spirometric parameters FVC, FEV1 and RV/TLC% were correlated with arterial PO2 and PCO2. while PCO2 was minimally related to FVC (r = 0.23; p<0.01), PO2 was more related to FEV1 (r =0.43: p<0.001); both PO2 and PCO2 showed a good inter-relationship (r = 0.70; p<0.001). There was no significant relation of blood gases to RV/TLC or pH. FEV1 is a useful predictor of arterial oxygen tension.