Continuous Positive Airway Pressure (CPAP) in Patients With Acute Coronary Syndrome and Obstructive Sleep Apnea (OSA)

OSA may be a modifiable risk factor for cardiovascular disease due to its association with hypertension, stroke, heart attack and sudden death. The standard therapy for symptomatic OSA is continuous positive airway pressure (CPAP). CPAP has been shown to effectively reduce snoring, obstructive episodes and daytime sleepiness and to modestly reduce blood pressure and other risk factors for cardiovascular disease. The overall aim of ISAACC is to determine if CPAP can reduce the risk of heart attack, stroke or heart failure for people with OSA admitted in a hospital for an acute coronary syndrome. Overall objective: To assess the impact of obstructive sleep apnea (OSA) and its treatment on the clinical evolution of patients with acute coronary syndrome (ACS). Primary objectives: 1\. To determine if continuous positive airway pressure (CPAP) treatment will reduce the rate of cardiovascular events (cardiovascular (CV) death, non-fatal events (acute myocardial infarction (AMI), non-fatal stroke, hospital admission for heart failure, and new hospitalizations) for unstable angina or transient ischaemic attack (TIA)) in patients with ACS and co-occurring sleep apnea. Secondary objectives: 1. Determine the prevalence of OSA in patients who have suffered an episode of ACS. 2. Other secondary objectives will include the effects of CPAP on: * To evaluate a composite of CV death, myocardial infarction (MI) and ischaemic stroke. * Components of primary composite endpoints * Re-vascularization procedures * To evaluate all-cause death * To evaluate new onset, ECG-confirmed atrial fibrillation or other arrhythmias * To evaluate newly diagnosed diabetes mellitus, according to standard definitions * To evaluate OSA symptoms (Epworth Sleepiness Scale (ESS)) * To evaluate quality of life in patients with ACS (Test EuroQol (EQ-5D). 3. To establish the relationship between the severity and phenotype of patients with OSA and clinical outcomes of ACS. 4. To est