Relationship Between Obstructive Sleep Apnea and Coronary Atherosclerosis

Study Overview
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Brief Summary
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Obstructive sleep apnea (OSA) is a respiratory disorder of sleep characterized by recurrent episodes of complete or partial upper airway obstruction, leading to intermittent oxygen deprivation. This results in sympathetic activation and surges in blood pressure, production of vasoactive substances, as well as activation of the inflammatory and procoagulant pathways. Epidemiological evidence indicates the prevalence of OSA is higher in patients with coronary artery disease than in the general population. The investigators recently showed that 65.7% and 41.9% of the Singapore patients admitted with myocardial infarction were found to have previously undiagnosed OSA and severe OSA, respectively. In a 10-year follow-up epidemiological study, OSA was independently associated with a higher prevalence of fatal and non-fatal cardiovascular events among the otherwise healthy general population. The investigators further showed that in patients who have undergone primary percutaneous coronary intervention for acute myocardial infarction, OSA was an independent predictor of future adverse event rates. Despite the observed association between OSA and adverse cardiovascular outcomes, the underlying pathophysiological mechanisms remain unclear. In this proposal, the investigators aim to elucidate the relationship between OSA and composition of coronary atherosclerotic plaques.

Official Title
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Intravascular Ultrasound Diagnostic Evaluation of Atherosclerosis in Singapore- Obstructive Sleep Apnea (IDEAS-OSA) Study

Conditions
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Coronary Artery Disease, Obstructive Sleep Apnea

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Angiogrqaphically documented coronary artery disease De novo lesion Native coronary artery Exclusion Criteria: known OSA intubation and mechanical ventilation electrical instability with a high risk of malignant ventricular arrhythmia cardiogenic shock previous coronary artery bypass surgery chronic renal failure on dialysis inability to give informed consent

Ages Eligible for Study
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Minimum Age: 21 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Moderate to Severe OSA<br> | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total Atheroma Volume | Relationship between OSA and Total Atheroma Volume determined (IVUS) will be determined | Baseline | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Thin-cap fibroatheroma | Relation between OSA and prevalence of thin-cap fibroatheroma (VH-IVUS) will be determined | Baseline | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Thin-cap fibroatheroma, Vulnerable plaque, Coronary artery disease, Obstructive sleep apnea, Intravascular Ultrasound