Background/Aim. It is necessary to find eligible oxidative stress markers for
predicting the severity of obstructive sleep apnea hypopnea syndrome
(OSAHS), a sleep disorder-related respiratory disease. We aimed to explore
the correlation between oxidative stress and cognitive impairment in OSAHS
patients. Methods. A total of 220 eligible patients were divided into
snoring, mild to moderate OSAHS and severe OSAHS groups according to
polysomnography (PSG). Apnea-hypopnea index (AHI), oxygen desaturation index
(ODI) and baseline data were monitored. Oxidative stress indices were
measured by colorimetry in early morning. They were divided into normal
cognitive and cognitive impairment groups based on Mini-Mental State
Examination (MMSE) and Montreal Cognitive Assessment (MoCA). Independent
risk factors for cognitive impairment were analyzed by multivariate logistic
regression. Correlation between oxidative stress and cognitive impairment
was analyzed by Pearson?s method. Receiver operating characteristic (ROC)
curves were plotted to analyze the efficiency of oxidative stress combined
with detection for assessing the cognitive impairment in OSAHS patients.
Results. Snoring, mild to moderate OSAHS and severe OSAHS groups had
significantly different snoring loudness, BMI, AHI, ODI, MoCA and MMSE
scores, and levels of malondialdehyde (MDA), glutathione peroxidase (GSH-Px)
and superoxide dismutase (SOD) (P<0.05). Cognitive impairment and normal
cognitive groups had different BMI, GSH-Px, MDA and SOD levels, neuroglobin,
hypoxia-inducible factor, AHI and lowest nocturnal oxygen saturation (P<0.05
or P<0.01). BMI, GSH-Px, MDA, SOD, neuroglobin, hypoxia-inducible factor,
AHI and lowest nocturnal oxygen saturation were independent risk factors for
cognitive impairment. The MoCA and MMSE scores of cognitive impairment had
positive correlations with GSH-Px and SOD, but negative correlations with
MDA (P<0.05). AUCs of GSH-Px, MDA, SOD and their combination for prediction
were 0.670, 0.702, 0.705 and 0.836, respectively. Conclusion. Oxidative
stress may be the biochemical basis of cognitive impairment in OSAHS
patients.