OSA and coronary plaque characteristics.

Area of Science:

• Cardiology
• Sleep Medicine
• Medical Imaging

Background:

• Virtual histology intravascular ultrasound (VH-IVUS) is an imaging technique for characterizing coronary plaques.
• Obstructive sleep apnea (OSA) is a common condition affecting cardiovascular health.
• The relationship between OSA and specific coronary plaque characteristics requires further investigation.

Purpose of the Study:

• To determine the association between obstructive sleep apnea (OSA) and coronary plaque characteristics in patients with coronary artery disease.
• To compare total atheroma volume and thin cap fibroatheroma prevalence in patients with varying OSA severity.

Main Methods:

• Prospective recruitment of patients with angiographically proven coronary artery disease.
• Utilized VH-IVUS for detailed plaque characterization.
• Conducted home-based sleep studies to diagnose and categorize OSA severity (apnea-hypopnea index).

Main Results:

• Among 93 patients, 32 (34.4%) had moderate to severe OSA.
• Patients with moderate to severe OSA exhibited significantly larger total atheroma volume (461.3 vs 299.2 mm³, P < .001).
• This association remained significant after adjusting for major cardiovascular risk factors.
• No significant difference in thin cap fibroatheroma prevalence was observed between OSA groups (53.1% vs 54.2%, P = .919).

Conclusions:

• Moderate to severe OSA is independently associated with increased total atheroma volume in the coronary artery.
• OSA severity is a significant factor in coronary plaque burden.
• Further research into continuous positive airway pressure (CPAP) therapy for OSA and its impact on atheroma volume is warranted.