A long-term follow-up study of noninvasive positive pressure ventilation on all-cause mortality in patients with chronic obstructive pulmonary diseaseobstructive sleep apnea overlap syndrome

Objective To investigate the effect of noninvasive positive pressure ventilation(NIPPV)on all-cause mortality in patients with chronic obstructive pulmonary disease-obstructive sleep apnea overlap syndrome(OvS)through long-term follow-up.Methods A total of 187 OVS patients were divided into the NIPPV group(n=92)and the non-NIPPV group(n=95).