Objective: To systematically review outcomes of adults with obstructive sleep apnoea treated with nasopharyngeal airway stenting devices. Methods: Medline, Scopus, Web of Science and the Cochrane Library databases were searched, and data on device use and tolerability, sleepiness, oxygen saturation, apnoea index, apnoea-hypopnoea index, and sleep quality were collected. Results: Of 573 potential studies, 29 were retrieved for detailed evaluation and 16 met the study criteria. Polysomnography

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... a for patients treated with nasal trumpets as an isolated therapy were pooled for metaanalysis. The mean apnoea index ± standard deviation, for 53 patients, decreased from 32.4 ± 15.9 to 9.0 ± 7.2 episodes per hour ( p < 0.00001). The mean apnoea-hypopnoea index, for 193 patients, decreased from 44.1 ± 18.9 to 22.7 ± 19.3 episodes per hour ( p < 0.00001). The mean lowest oxygen saturation, for 193 patients, increased from 66.5 ± 14.2 to 75.5 ± 13.9 per cent ( p < 0.00001). Conclusion: Some studies have demonstrated limited effectiveness and low tolerability of nasopharyngeal airway stenting devices, while other studies have shown a significant benefit in treating obstructive sleep apnoea, with a high level of patient acceptance. Nasal trumpets have been successful in decreasing airway obstruction in the short term.