Continuous Positive Airway Pressure (CPAP) Treatment in Coronary Artery Disease and Sleep Apnea

Rationale: OSA is a common condition in CAD with a poor prognosis.Many of these subjects do not report daytime sleepiness, and therefore, are not considered for OSA treatment with CPAP. There is lack of evidence regarding the impact of CPAP on the long-term prognosis of CAD patients with OSA.

Objective: The RICCADSA trial is designed to address if CPAP treatment reduces the combined rate of new revascularization, myocardial infarction, stroke and cardiovascular mortality over a mean follow-up period of 3-years in CAD patients with OSA (Apnea-Hypopnea-Index [AHI]>=15 per h) without daytime sleepiness (Epworth Sleepiness Scale [ESS]<10). Secondary outcomes include cardiovascular biomarkers, cardiac function, maximal exercise capacity and quality of life at baseline, 3-month- and 1-year follow-up as well as polysomnographic findings and adherence to CPAP therapy.

Patients and Methods: A sample of 511 CAD patients (122 non-sleepy OSA patients randomized to CPAP, 122 to non-CPAP; 155 sleepy OSA patients [ESS>=10] on CPAP, and 112 CAD patients without OSA [AHI <5 per h]) were included. The trial has 80% power to detect a risk reduction from an assumed composite end-point rate of 25% to 12% for the primary outcome at intention-to-treat basis.

Inclusion criteria

• Patients with angiographically-verified CAD who have newly undergone PCI or CABG treatment
• Written, informed study consent
• OSA (AHI>=15 per hour) or non-OSA (AHI<5 per hour) diagnosis on the unattended sleep recording at home

Exclusion criteria

• Patients with already treated OSAS
• Patients presenting mainly central apneas (Cheynes-Stokes breathing)
• Patients with borderline OSA (AHI <15 and >=5 per hour) upon the unattended sleep recording at home