Obstructive Sleep Apnea in Coronary Artery Disease

Area of Science:

• Cardiology
• Sleep Medicine
• Pulmonology

Background:

• Obstructive sleep apnea (OSA) is a prevalent sleep disorder characterized by airway obstruction during sleep.
• OSA leads to sleep fragmentation, intermittent hypoxia (IH), and altered hemodynamics, contributing to poor sleep quality and reduced life quality.
• OSA is independently linked to both structural coronary artery disease (CAD) and functional CAD, involving atherosclerosis and coronary vasomotor disorders.

Purpose of the Study:

• To explore the association between obstructive sleep apnea and cardiovascular disease.
• To investigate the mechanisms linking OSA to cardiovascular risks, particularly atherogenesis.
• To evaluate the efficacy of continuous positive airway pressure (CPAP) therapy in mitigating cardiovascular events in OSA patients.

Main Methods:

• Review of existing literature and meta-analyses on OSA and cardiovascular outcomes.
• Analysis of factors contributing to cardiovascular risk in OSA, including intermittent hypoxia and sleep fragmentation.
• Examination of data from randomized controlled trials (RCTs) assessing CPAP therapy for cardiovascular event reduction.

Main Results:

• Intermittent hypoxia (IH) and its adaptive responses are strongly implicated in OSA's role in atherogenesis.
• Meta-analyses suggest CPAP therapy may reduce major adverse cardiovascular events.
• However, pivotal randomized controlled trials have not consistently demonstrated the significance of CPAP in reducing cardiovascular events.

Conclusions:

• OSA poses significant cardiovascular risks through mechanisms like intermittent hypoxia.
• CPAP therapy's role in preventing major adverse cardiovascular events requires further investigation, despite some positive meta-analytic findings.
• The complex relationship between OSA, its associated physiological changes, and cardiovascular disease necessitates continued research.