Should persistent sleep-apnea symptoms despite PAP use prompt reassessment?

Persistent symptoms or witnessed breathing events during PAP therapy should not be assumed to represent treatment failure from pressure alone. In an 83-year-old, reassessment is particularly important because residual sleep-disordered breathing, hypoxemia, hypoventilation, and cardiopulmonary contributors can coexist.

Clinical effectiveness

• AASM guidance supports clinical reassessment and, when indicated, follow-up PSG or HSAT for persistent or recurrent OSA symptoms despite good PAP adherence, or for unexplained device-download findings.
• Appropriate PAP titration is designed to eliminate obstructive apneas, hypopneas, respiratory-effort–related arousals, and snoring. A preferred laboratory endpoint is respiratory disturbance index (RDI) <5 events/hour, acceptable leak, and sustained control—ideally including supine REM sleep.
• Titration also targets obstruction-free oxygenation, generally maintaining SpO₂ >90%. Thus, reassessment can determine whether current settings are controlling both residual respiratory events and obstruction-related desaturation.

Practical and mechanistic considerations

• Evaluation should first integrate objective use data, pressure settings, mask/interface fit, and leak. Adherence data are reliable, but substantial leak can impair therapy delivery and make device event detection less reliable.
• Device-derived residual AHI is useful for screening but is not equivalent to PSG-derived AHI. Proprietary flow algorithms may underestimate hypopneas, arousal-related events, REM/supine-predominant obstruction, central events, or hypoxemia.
• Persistent desaturation despite apparently controlled device events may reflect residual obstruction, sleep-related hypoventilation, or cardiopulmonary disease. Overnight oximetry can detect hypoxemia but cannot determine whether ventilation is inadequate; PSG on PAP, potentially with carbon-dioxide assessment, can clarify this.

Bottom line

• Persistent symptoms or witnessed events despite PAP are a strong, evidence-supported reason for structured reassessment. Review adherence, leak, settings, and download data first; if uncertainty persists, follow-up PSG/titration can establish whether PAP is adequately controlling respiratory events and oxygen disruption and identify causes requiring more than a pressure adjustment.