A cohort study to identify simple clinical tests for chronic respiratory failure in obese patients with sleep-disordered breathing

(1) SpO2 of ≤95% for men and ≤93% for women and 

(2) FVC of ≤3.5 L for men and ≤2.3 L for women, in predicting hypercapnia.

En BMJ               

CME_ERS (Overlap Syndrome)