Telemonitoring With CPAP in Severe Obstructive Sleep Apnea in Primary Health Care

Inclusion Criteria: * Age between 18 and 75 years. * Diagnosis of severe obstructive sleep apnea (OSA) confirmed by polysomnography with apnea-hypopnea index (AHI) ≥30 events/hour. * New CPAP users (≤30 days since initiation of CPAP therapy). * Resident within the coverage area of the Southeast Regional Health Coordination (CRS Sudeste), São Paulo, Brazil. * Ability to understand and sign the informed consent form. Exclusion Criteria: * Previous CPAP use for more than 30 days prior to enrollment. * Indication for bilevel ventilation (BiPAP) or non-invasive ventilation due to conditions such as hypoventilation syndromes, chronic hypercapnic COPD, or neuromuscular diseases. * Predominant central sleep apnea (≥50% central events) or Cheyne-Stokes respiration. * Recent unstable or severe comorbidity (e.g., decompensated heart failure, acute coronary syndrome within 30 days, stroke within 3 months). * Severe cognitive impairment or psychiatric disorder that prevents understanding of study procedures or adherence. * Conditions preventing safe use of CPAP mask (e.g., major craniofacial deformities, facial trauma, extensive facial skin lesions). * Inability to maintain follow-up in primary care services of CRS Sudeste. * Participation in another interventional clinical trial that may interfere with study outcomes.