Evidence for lipid peroxidation in obstructive sleep apnea

Area of Science:

• Cardiology
• Sleep Medicine
• Biochemistry

Background:

• Obstructive sleep apnea syndrome (OSA) is linked to increased cardiovascular morbidity.
• Oxidative stress is a proposed mechanism underlying this association.

Purpose of the Study:

• To investigate lipid peroxidation biomarkers in OSA patients compared to controls.
• To assess the impact of nasal continuous positive airway pressure (nCPAP) treatment on these biomarkers.

Main Methods:

• Experiment 1: Measured plasma thiobarbituric reactive substances (TBARS), peroxides (PD), and paraoxonase-1 (PON1) in OSA patients (with/without cardiovascular disease) and controls.
• Correlated biomarker levels with respiratory disturbance index (RDI).
• Experiment 2: Measured nocturnal TBARS and PD in OSA patients before and after nCPAP treatment, and in controls.

Main Results:

• OSA patients exhibited significantly higher morning TBARS and PD levels than controls.
• Lower PON1 levels were observed in OSA patients with cardiovascular disease.
• TBARS and PD positively correlated with RDI; PON1 negatively correlated with RDI.
• Nocturnal TBARS and PD were reduced by nCPAP treatment in OSA patients.

Conclusions:

• Findings support elevated oxidative stress in OSA.
• Results suggest OSA's potential role in cardiovascular morbidity.
• nCPAP treatment may mitigate oxidative stress associated with OSA.