In a 69-year-old woman with chronic insomnia who has completed two sessions of cognitive behavioral therapy for insomnia (CBT‑I), an Epworth Sleepiness Scale score of 2, and polysomnography showing an apnea‑hypopnea index of 14 events per hour, a REM‑specific apnea‑hypopnea index of 22 events per hour, and an oxygen saturation nadir of 88%, what is the next best step in management?

Continue CBT-I and Treat Sleep-Disordered Breathing Simultaneously

The next best step is to continue CBT-I while simultaneously initiating treatment for her obstructive sleep apnea with positive airway pressure (PAP) therapy (Answer C). This patient has both clinically significant insomnia (chronic difficulty staying asleep for years) and moderate OSA (AHI 14/hr with REM-predominant disease at 22/hr and oxygen desaturation to 88%), both of which require treatment to optimize her quality of life and reduce long-term cardiovascular morbidity.

Clinical Reasoning

Why Both Conditions Need Treatment

This patient presents with comorbid insomnia and obstructive sleep apnea (COMISA), a common clinical scenario that requires addressing both conditions:

• Her OSA is clinically significant: An overall AHI of 14/hr qualifies as moderate OSA, but more importantly, her REM AHI of 22/hr indicates substantial REM-related sleep-disordered breathing with oxygen desaturation to 88%. Even without significant daytime sleepiness (ESS 2/24), PAP therapy improves quality of life, reduces cardiovascular risk including stroke, and prevents long-term morbidity 1.

• Her insomnia is the primary complaint: Years of difficulty staying asleep brought her to clinic, and she's already engaged in CBT-I with two sessions completed. Stopping this evidence-based treatment prematurely would abandon the intervention most likely to address her chief complaint 1.

Evidence for Concurrent Treatment

Recent high-quality research strongly supports simultaneous treatment of COMISA rather than sequential approaches:

• A 2022 randomized controlled trial demonstrated that concurrent CBT-I and PAP therapy produces more rapid improvements in both sleep parameters and daytime functioning compared to sequential treatment 2. While both approaches ultimately work, concurrent treatment accelerates outcomes.

• A 2019 RCT showed that CBT-I before PAP increases PAP acceptance (99% vs 89%) and adherence (61 additional minutes of nightly use) 3. However, this doesn't mean delaying OSA treatment—it means CBT-I enhances PAP therapy outcomes.

• The 2020 VA/DoD guidelines emphasize that both CBT-I and PAP therapy are evidence-based first-line treatments for their respective conditions, with established efficacy and safety profiles 1.

Addressing Safety Concerns

The sleep restriction component of CBT-I does NOT need to be discontinued:

• A 2020 study specifically examined week-to-week changes during CBT-I in patients with moderate-severe OSA and found only a transient 15% increase in ESS scores (1.3 points) after the first week of sleep restriction, which immediately returned to baseline while sleep parameters continued improving 4.

• This patient has minimal baseline sleepiness (ESS 2/24), providing substantial safety margin. Patients should be monitored for increased sleepiness, but discontinuing sleep restriction is not indicated 4.

• The concern about worsening sleepiness is theoretical and not supported by clinical trial data showing CBT-I is safe and effective even in severe OSA 4, 5.

Treatment Algorithm

Immediate actions:

1. Continue CBT-I - She's only completed 2 sessions of a typically 4-6 session protocol. Stopping now wastes the investment already made and abandons treatment for her primary complaint.

2. Initiate PAP therapy - Order PAP titration study and begin therapy. Her moderate OSA with significant REM-related events and oxygen desaturation requires treatment regardless of minimal daytime sleepiness.

3. Monitor closely - Weekly check-ins during the initial 2-4 weeks to assess for increased daytime sleepiness, PAP adherence issues, or worsening insomnia symptoms.

4. Provide PAP adherence support - Educational and behavioral interventions to optimize PAP use, as recommended by guidelines 1. The CBT-I she's receiving will likely enhance her PAP acceptance and adherence 3.

Common Pitfalls to Avoid

• Don't delay OSA treatment: Waiting to "complete CBT-I first" (Answer B) unnecessarily postpones treatment of a condition with cardiovascular consequences. Her oxygen desaturation to 88% and REM AHI of 22/hr warrant prompt intervention.

• Don't abandon CBT-I: Discontinuing CBT-I (Answer A) throws away an evidence-based treatment for her primary complaint after she's already invested time in two sessions.

• Don't unnecessarily modify CBT-I: Discontinuing sleep restriction (Answer D) is not supported by evidence and may reduce CBT-I efficacy. Sleep restriction is a core component that improves sleep consolidation 1.

• Don't be misled by low ESS: Her ESS of 2/24 doesn't mean her OSA is clinically insignificant. ESS has poor sensitivity for OSA (38% in one study), and many patients with significant OSA lack subjective sleepiness 6. Her oxygen desaturation and REM-predominant disease still carry cardiovascular risk.

Nuances in This Case

The REM-predominant pattern (REM AHI 22/hr vs overall AHI 14/hr) is clinically important—REM sleep apnea is associated with hypertension and cardiovascular disease even when overall AHI appears only "moderate." This strengthens the indication for PAP therapy regardless of her minimal subjective sleepiness.

Her age (69 years) and female sex don't contraindicate either treatment. CBT-I remains highly effective in older adults, including those with comorbid conditions and pain 5, 7. PAP therapy benefits persist across age groups.