The nastent™ classic, a nasal airway stent (NAS), is a tube-shaped medical device that is positioned from the nose to the soft palate near the uvula. It is expected to reduce snoring by preventing the narrowing and obstruction of the airway and reduce apnea/hypopnea index (AHI) in patients with obstructive sleep apnea (OSA).
We aimed to examine the tolerability and effectiveness of NAS in snoring.
We prospectively enrolled subjects who had not been treated for sleep apnea syndrome (SAS) and had no serious complications. We examined the effectiveness of NAS by recording the snoring sounds. A questionnaire survey on the pain caused by NAS treatment was conducted.
Out of 23 subjects recruited, 18 completed the study. Most of the subjects showed improvements of snoring measured as the percentage of snoring time in their total sleep time, average snoring volume, maximum snoring volume, and snoring index (SI, percentage of snoring time in total sleep time multiplied by average snoring volume) after the use of NAS. In time, the subjects got accustomed to wearing the NAS, presenting fewer complaints of discomfort and improvement in sleep in most cases. Out of 23 subjects recruited, five subjects showed an AHI > 5. However, only two subjects who showed an AHI > 5 completed the study.
The NAS helped to reduce the snoring loudness and duration in most subjects. Pains caused by NAS treatment gradually decreased as the subjects became accustomed to it.