determination of the relationship between severity of obstructive sleep apnea and chronic obstructive pulmonary disease

introduction: chronic obstructive pulmonary disease (copd) patients are at increased risk of sleep-disorders. the concomitant occurrence of copd and obstructive sleep apnea hypopnea syndrome (osahs) is named overlap syndrome. this study aimed to evaluate the severity of osahs in overlap syndrome patients.materials & methods: this cross-sectional study was conducted on adult patients with forced expiratory volume in 1 second (fev1%)/forced vital capacityresults: forty patients (62.5% male) with mean age of 59.7±8.3 years participated in the study. severity of obstructive sleep apnea was low, moderate, and severe in 23 (57.5%), 14 (35%), and 3 (7.5%) cases, respectively and there was no statistical relation between osahs and fev1% (p=0.55).conclusion: this study showed that there was no significant correlation between apnea–hypopnea index and fev1% predicted in overlap syndrome patients.