Can old PAP settings stop adequately controlling sleep-disordered breathing?

Positive-airway-pressure (PAP) treatment should be viewed as an ongoing therapy rather than a permanently fixed prescription. For this 83-year-old man, an older titration does not itself establish that current settings are inadequate, but clinical changes or evidence of ineffective treatment warrant review.

Clinical effectiveness and reassessment

• PAP pressure requirements, and sometimes the appropriate modality, can change with substantial weight change, evolving medical conditions, recurrent daytime or nocturnal symptoms, witnessed pauses, or persistent residual events. A commonly cited trigger is roughly 10–20% weight gain or loss.
• Repeat sleep testing is not routinely recommended for patients who remain asymptomatic and clinically well controlled on PAP. In a retrospective cohort of 988 auto-CPAP users followed for about 10 months, mean 90th-percentile pressure changed nonsignificantly by −0.46 cm H₂O; weight loss and baseline disease severity, rather than time, were associated with pressure trajectories.
• When treatment appears ineffective, review should include adherence, residual event patterns, oxygenation, symptoms, and mask fit. Repeat titration is particularly appropriate to consider when the original titration was neither “optimal” nor “good.”

Mechanistic and measurement considerations

• Effective PAP should suppress obstructive apneas, hypopneas, respiratory-effort–related arousals, and snoring while preserving adequate oxygenation and acceptable leak; selected pressures generally target oxygen saturation >90% at sea level.
• Device-reported residual AHI is useful but imperfect. Automated scoring may underestimate residual events, especially in people with baseline central apnea. Intermittent unintentional leak reduced reported residual AHI by an average 33.8% in a bench study, with device-specific variation.
• Persistent treatment-emergent central sleep apnea after an appropriate CPAP trial should prompt evaluation of contributing conditions and consideration of alternative PAP approaches.

Bottom line

• Old settings can become inadequate when clinical circumstances or event patterns change, but the age of a sleep study alone is not evidence of failure. Reassessment should be driven by symptoms, PAP download data, leak, oxygenation, and—when indicated—repeat testing or specialist titration.