 - OR Patient with a predominant obstructive SAS 50 central event whose Continuous Positive Airway Pressure treatment CPAP does not allow adequate control of the central events: treated for at least 1 month CPAP with a residual central apnea hypopnea index greater than or equal to 10 events per hour AHI global 15, which AHIc 10 pressure to control obstructive events IAHo 5 controlled by polygraphy or polysomnography with a pressure test 10 cm H2O. 