Oxidative Stress Markers among Obstructive Sleep Apnea Patients.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic and clinical literature without systematic search methodology.
PubMed 34336121 · doi:10.1155/2021/9681595
What was done
This narrative review synthesized literature on the relationship between obstructive sleep apnea (OSA), intermittent hypoxemia, and reactive oxygen species generation. The authors evaluated multiple oxidative stress biomarkers, their potential clinical utility for tracking disease severity and treatment response, and the effects of continuous positive airway pressure (CPAP) and antioxidant compounds.
What was found
The abstract reports no numerical data, effect estimates, or study counts. It qualitatively notes that OSA generates reactive oxygen species leading to systemic oxidative stress, endothelial dysfunction, and cardiovascular risk. Biomarkers discussed include high-sensitivity C-reactive protein, pregnancy-associated plasma protein-A, superoxide dismutase, cell-free DNA, 8-hydroxy-2-deoxyguanosine, advanced oxidation protein products, lipid peroxidation products, receptor for advanced glycation end-products, and thioredoxin. CPAP decreases oxidative stress, whereas antioxidant supplements reduce markers but have an unclear clinical role in OSA treatment.
Why it matters
This review outlines the oxidative pathways connecting sleep-disordered breathing to cardiovascular disease and identifies potential circulating biomarkers for assessing therapeutic response.
Limits
As a narrative review, it lacks a systematic search protocol, explicit study selection criteria, risk-of-bias assessment, or quantitative meta-analysis. The abstract provides no primary data, effect sizes, or definitive evidence supporting antioxidant pharmacotherapy in OSA.
Cited by
- supports Intermittent hypoxia from conditions such as sleep apnea generates reactive oxygen species (ROS).