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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
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Assessment of Comprehensive Patient-Reported Outcomes Before and After CPAP Therapy in Obstructive Sleep Apnea.

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Continuous Positive Airway Pressure (CPAP) therapy significantly improves obstructive sleep apnea (OSA) symptoms like sleepiness and mood. High CPAP adherence, not residual respiratory events, predicts better patient-reported outcomes and cognitive function over six months.

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Area of Science:

  • Sleep Medicine
  • Respiratory Medicine
  • Neuroscience

Background:

  • Obstructive sleep apnea (OSA) negatively affects daytime alertness, mood, cognition, and quality of life (QoL).
  • The initial impact of CPAP therapy on patient-reported outcomes (PROs) and cognitive function, and its relationship with adherence and residual respiratory events, requires further understanding.

Purpose of the Study:

  • To evaluate changes in PROs and cognitive performance in adult OSA patients after six months of CPAP therapy.
  • To determine the association between improvements in PROs and cognitive function with CPAP adherence and residual respiratory events (e.g., Apnea-Hypopnea Index [AHI]).

Main Methods:

  • A retrospective observational study involving 72 adult OSA patients from January 2024 to May 2025.
  • Standardized assessments including Epworth Sleepiness Scale (ESS), WHOQOL-BREF, MoCA, DASS-21, GAD-7, and PHQ-9 were conducted at baseline and six months post-CPAP initiation.
  • Primary endpoint: change in PROs and cognitive performance. Secondary endpoint: association between improvements, CPAP adherence, and residual AHI.

Main Results:

  • After six months, significant improvements were observed in ESS (14 to 8.6), PHQ-9 (7 to 7.1), GAD-7 (5 to 6.2), and MoCA (24 to 25.3).
  • WHOQOL-BREF scores improved across all domains. However, residual excessive daytime sleepiness (EDS) and cognitive impairment persisted in a notable percentage of patients.
  • High CPAP adherence (mean 87.7%, median 95%) predicted greater ESS reduction (p=0.027) and a trend toward PHQ-9 improvement (p=0.066). Residual respiratory indices did not correlate with PRO or cognitive scores.

Conclusions:

  • Six-month CPAP therapy yields significant improvements in sleepiness, mood, anxiety, cognition, and quality of life for OSA patients.
  • Residual EDS and cognitive challenges remain common issues despite treatment.
  • CPAP adherence is a stronger predictor of positive outcomes than residual respiratory event levels (AHI, ODI).