Results: 101 patients with chronic obstructive pulmonary disease were enrolled, (98% male, age 67.2 ± 7.7; BMI 21.2 ± 3.7 kg / m2, 78.2% in group B and group D, predicted post-bronchodilator FEV1 50.3 ± 16.6%), who underwent a ventilatory polygraph with 5 channels. There are 30 (29.7%) patients cormobid with obstructive sleep apnea (AHI ≥ 15 events / hour).