Oxidative Stress Markers and Severity of Obstructive Sleep Apnea.
Level 4 - case-series / case-control
Cross-sectional comparative study evaluating biomarker levels across disease severity tiers without prospective follow-up.
PubMed 31559568 · doi:10.1007/5584_2019_433
What was done
Plasma total antioxidant status (TAS) and thiobarbituric acid-reacting substances (TBARS, measuring lipid peroxides) were measured spectrophotometrically in 106 non-smoking, obese Caucasian men aged 41–60 with normal oral glucose tolerance tests. Participants underwent polysomnography and were grouped by apnea-hypopnea index (AHI) into four tiers: control/no OSA (AHI < 5/h, n = 26), mild OSA (AHI 5–15/h, n = 26), moderate OSA (AHI 16–30/h, n = 27), and severe OSA (AHI > 30/h, n = 27).
What was found
Plasma TAS decreased significantly and plasma TBARS increased significantly across increasing severity stages from OSA-0 to OSA-3. The abstract does not report specific numerical values, effect sizes, or exact p-values.
Why it matters
The study indicates that systemic oxidative stress increases and antioxidant defense decreases alongside sleep apnea severity, even in the absence of smoking, diabetes, or impaired glucose tolerance.
Limits
The abstract reports no exact numerical data, standard deviations, or confidence intervals. The sample is small (n = 106), cross-sectional, and restricted strictly to obese Caucasian men aged 41–60 with normal glucose tolerance, limiting generalizability to women, non-obese individuals, other ethnicities, or patients with typical comorbidities. The cross-sectional design cannot establish causality between sleep apnea severity and oxidative stress markers.
Cited by
- supports Mild obstructive sleep apnea is clinically categorized as having between 5 and 15 breathing cessation events per hour of sleep.