Objective:To investigate the clinical efficacy of N-acetylcysteine(NAC) combined with bilevel positive airway pressure(Bi PAP) in the treatment of obstructive sleep apnea-hypopnea syndrome(OSAHS).Methods: A total of 150 patients with moderate or severe OSAHS were randomly and equally divided into three groups(groups A, B, and C). We measured the biochemical parameters of these patients after 12 weeks of treatment. Results: After 12 weeks of treatment, the three groups showed significant improvements in meta...