RESUMO
Purpose. To investigate whether oral intake of N-acetylcysteine (NAC) is a treatment option in patients with obstructive sleep apnoea syndrome (OSAS). Methods. Twenty patients with OSAS were enrolled in the study. After polysomnography (PSG), they were randomly assigned to receive a placebo (n=10) and NAC (n=10). A repeat PSG was done after the treatment period of 30 days. Fasting venous samples were collected for various biochemical analysis. Results. In the patients of NAC group, compared to their baseline values, slow wave sleep as sleep percent time (27.9±2.7 vs 42.3±4.2; p<0.01) and sleep efficiency (90.8±1.3 vs 94.4±1.5; p<0.05) improved considerably. The apnoea-hypopnoea index (61.2±8.5 vs 43.1±8.6; p<0.05), apnoea related arousals (22.2±7.6 vs 11.6±4.7; p<0.05), longest apnoeic episode duration (seconds) (54.9±7.1 vs 37.8±5.6; p<0.01), oxygen desaturation events per hour (51.8±7.7 vs 37±7.8; p<0.01) and epworth sleepiness score (16.6±0.8 vs 9.2±0.9; p<0.001) decreased significantly. The relative snore time (%) (10.2±2.9 vs 4.9±1.9; p<0.01), number of snore episodes (63.8±23.9 vs 28.2±9.9; p<0.05) and duration of longest snore episode (min) (2.5±0.7 vs 0.6±0.1; p<0.05) also decreased significantly. Such responses were not evident in the placebo group. N-acetylcysteine produced significant decrease in lipid peroxidation and increase in total reduced glutathione. Conclusions. Oral NAC administration appears to have a therapeutic potential in the treatment of OSAS. It is proposed that long-term treatment with NAC in patients with OSAS may reduce their dependency on continuous positive airway pressure therapy.