Effect of fractional exhaled carbon monoxide on patients with sleep apnea-hypopnea syndrome and its mechanism.

Abstract

Sleep-disordered breathing (SDB) is a common sleep disorder as-sociated with chronic airway inflammation and lung function impairment. This article aimed to investigate the fractional exhaled carbon monoxide (FeCO) expression level in obstructive sleep apnea-hypopnea syndrome (OSAHS) and its correlation with disease indicators. Subjects with OSAHS, asthma, chronic obstructive pulmonary disease (COPD), and healthy subjects were selected to collect clinical data. FeCO concentration, eosinophil (Eos), erythrocyte sed-imentation rate (ESR), C-reactive protein (CRP), FEV1, and FEV1/FVC were measured. The Pearson correlation coefficient and receiver operating charac-teristic (ROC) curve were used for statistical analysis. The FeCO concentra-tion, Eos count, ESR and CRP levels, and lung function in the OSAHS group were higher than the healthy and COPD groups (p<0.05) and slightly lower than the asthma group. FeCO was positively correlated with Eos, ESR, and CRP (p<0.05), but there was no apparent correlation between FeCO and lung func-tion. FeCO has a high sensitivity and specificity in the diagnosis of OSAHS. There is chronic airway inflammation and systemic inflammation in patients with OSAHS. Lung function impairment in patients with OSAHS is mild, but some limitations remain. FeCO may be an auxiliary diagnostic index particu-larly valuable in diagnosing OSAHS.