Sleep Apnea, CentralCheyne-Stokes RespirationSleep Apnea SyndromesPolysomnographySleep Apnea, ObstructiveSleepContinuous Positive Airway PressureHeart FailureRespirationHypocapniaPositive-Pressure RespirationCarbon DioxideSleep, REMOxygen Inhalation TherapyHypercapniaSleep DisordersSeverity of Illness IndexSnoringOxygenStroke VolumeTreatment OutcomePalate, SoftWakefulnessProspective StudiesFollow-Up StudiesMandibular AdvancementUvula