Hypoxic Burden Predicts Symptomatic but Not Sleep Architecture Response to CPAP Therapy in Obstructive Sleep Apnea

In 412 patients with obstructive sleep apnea, hypoxic burden (HB) is linked more strongly than apnea-hypopnea index (AHI) to CPAP-related symptomatic improvement, including fatigue and sleep quality.

• Why it matters: AHI gauges event frequency but misses oxygen-related physiological stress, leaving uncertainty about which metric best predicts patient-reported and objective CPAP responses.
• What they did: HB was computed from diagnostic polysomnography using a validated event-based algorithm, and multivariable regression models tested prediction of subjective outcomes and sleep-architecture changes after CPAP, adjusting for age, sex, and body mass index.
• The result: HB improved model fit and explained variance, stayed independently associated with lower follow-up fatigue and better sleep quality after accounting for AHI, while AHI best predicted objective sleep-architecture changes; HB added independent information for arousal burden changes.

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