In this MedCram review, Dr. Roger Seheult takes a comprehensive look at obstructive sleep apnea (OSA) and the wide range of treatments available, focusing on a newly published meta-analysis that evaluated randomized controlled trials from 2017 to 2025. The central questions are straightforward and clinically important: which therapy most effectively reduces the apnea-hypopnea index (AHI), which one best improves daytime sleepiness as measured by the Epworth Sleepiness Scale, and which interventions meaningfully improve overall quality of life?
What is OSA?
Obstructive sleep apnea occurs when the airway collapses during sleep, most commonly at the level of the tongue and soft tissues in the back of the throat. As muscles relax, the tongue can fall backward, narrowing or completely obstructing airflow. Continuous positive airway pressure, or CPAP, works by delivering pressurized air through a mask to stent the airway open, much like inflating a soft tube to prevent collapse. A mandibular advancement device (MAD), often prescribed by dentists, mechanically pulls the lower jaw forward, which in turn draws the tongue away from the posterior airway. Other strategies aim to address underlying contributors. Weight loss through diet, lifestyle changes, bariatric surgery, or GLP-1–based medications such as tirzepatide can reduce fat deposition in the tongue and surrounding tissues. Hypoglossal nerve stimulation involves an implanted device that senses inhalation and stimulates the hypoglossal nerve, activating the genioglossus muscle to move the tongue forward during sleep. Oropharyngeal myofunctional therapy (OMT) consists of targeted exercises designed to strengthen the muscles of the mouth and throat. In addition, certain medications do not treat airway obstruction directly but instead promote wakefulness to reduce daytime sleepiness.
The meta-analysis synthesized data from major databases including PubMed, Embase, Web of Science, and Cochrane, comparing these interventions across three primary outcomes. When it came to reducing AHI—the number of breathing interruptions per hour of sleep—CPAP emerged as the most effective overall therapy. Physical activity performed surprisingly well, ranking close behind CPAP in reducing AHI. Mandibular advancement devices and hypoglossal nerve stimulation also demonstrated meaningful reductions, while diet and lifestyle interventions alone produced more modest improvements. Bariatric surgery showed benefit, and GLP-1–based weight loss therapies significantly reduced AHI in trials such as the SURMOUNT-OSA study published in the New England Journal of Medicine in 2024. In that study, substantial weight loss of approximately 18 to 20 percent corresponded with reductions of roughly 25 to 29 apnea events per hour. Oropharyngeal myofunctional therapy, while helpful, showed smaller average reductions in AHI compared with CPAP and structured physical activity.
Which treatments are better?
When active treatments were compared head-to-head, CPAP consistently outperformed mandibular advancement devices, positional therapy, oral surgery, and even bariatric surgery in lowering AHI. Physical activity came remarkably close to CPAP, although CPAP still held a slight edge overall. Combination strategies proved especially effective. Adding diet and lifestyle modifications to CPAP enhanced outcomes beyond CPAP alone, and pairing CPAP with GLP-1 therapy improved efficacy further. OMT added to CPAP provided only modest additional benefit for AHI reduction.
Daytime sleepiness, however, told a slightly different story. The medication solriamfetol ranked highest for improving Epworth Sleepiness Scale scores, which is not surprising given its wake-promoting pharmacologic action. Modafinil and other stimulants also performed well. CPAP significantly improved daytime alertness, as expected. Interestingly, hypoglossal nerve stimulation and OMT demonstrated meaningful improvements in sleepiness, even when their AHI reductions were less dramatic. Physical activity again stood out, showing improvements in daytime sleepiness comparable to CPAP. This suggests that exercise may enhance alertness through mechanisms beyond simply reducing airway obstruction, potentially involving cardiovascular conditioning, metabolic health, or neurochemical pathways.
Quality of life outcomes revealed another compelling pattern. CPAP improved quality of life measures, as did wake-promoting medications and hypoglossal nerve stimulation. However, physical activity demonstrated the strongest overall association with enhanced quality of life. This finding aligns with broader medical literature showing that exercise improves mood, cardiovascular health, metabolic function, and overall well-being. In contrast, mandibular advancement devices did not significantly outperform inactivity in some quality-of-life comparisons, despite their effectiveness in reducing AHI.
It is important to interpret these results in context. Meta-analyses provide averages across populations, not guarantees for individuals. A patient who cannot tolerate CPAP may do exceptionally well with a mandibular advancement device or hypoglossal nerve stimulation. Medicine is practiced at the bedside, where individual anatomy, comorbidities, preferences, and tolerance all matter. These findings help guide decision-making but do not replace personalized care.
Taken together, the evidence supports CPAP as first-line therapy for most patients with obstructive sleep apnea due to its superior AHI reduction and strong improvements in sleepiness and quality of life. However, the addition of regular physical activity appears to amplify benefits across all major outcomes and may rival CPAP in certain domains. Oropharyngeal myofunctional therapy can serve as a helpful adjunct, particularly for improving daytime symptoms. Weight loss strategies, including GLP-1 therapies and bariatric surgery, offer additional benefits, especially in patients with obesity.
For patients beginning treatment, a practical approach may include CPAP combined with structured physical activity and, when appropriate, targeted airway exercises. If CPAP is not tolerated, alternative modalities remain viable and evidence-based options. Ultimately, the most effective treatment plan is one that balances physiologic benefit with long-term adherence, improving not only breathing at night but also daytime function and overall quality of life.
LINKS / REFERENCES:
Oral Exercises to Help with Snoring and Sleep Apnea (YouTube) | • Oral Exercises to Help with Snoring and Sl…
Effect of sleep apnoea interventions on multiple health outcomes: an umbrella review of meta-analyses of randomised controlled trials (Lancet) | https://www.thelancet.com/journals/ec…
Excess Deaths at Night – Obstructive Sleep Apnea Explained Clearly (MedCram) | • Excess Deaths at Night – Obstructive Sleep…