Adenoid hypertrophy causing obstructive sleep apnea in children after pharyngeal flap surgery.

Purpose: Pharyngeal flap surgery used for treatment of velopharyngeal insufficiency (VPI) may be followed by obstructive sleep apnea (OSA) especially if the patient has developed adenoid hypertrophy. However, adenoidectomy may adversely affect speech in these patients. The aim of this study was to assess the effectiveness of transnasal endoscopic power-assisted adenoidectomy in relieving OSA in patients with adenoid hypertrophy who underwent pharyngeal flap surgery, and the impact of the procedure on their speech.

Methods: Transnasal endoscopic power-assisted adenoidectomy for nine children presenting with adenoid hypertrophy was performed. The patients had previously undergone pharyngeal flap surgery for treatment of VPI. Flexible nasopharyngoscopy was used in the diagnosis of adenoid hypertrophy. Pre- and postoperative polysomnography with measurement of apnea-hypopnea index (AHI) was done. Additionally, auditory perceptual assessment of speech (APA) and nasalance scores was measured pre- and postoperatively.

Results: All patients were shown to have OSA by polysomnography, and a larger adenoid size was significantly associated with a higher AHI. We achieved a significant improvement in AHI after adenoidectomy. However, six patients still demonstrated OSA, albeit with a reduced severity. Speech was not adversely affected postoperatively as the APA and nasalance scores showed non-significant changes.

Conclusion: Adenoid hypertrophy may be encountered in children who undergo pharyngeal flap surgery, which may cause OSA. Transnasal endoscopic power-assisted adenoidectomy is a safe and effective method for treatment of OSA in those patients without prejudicing the pharyngeal flap, and it has no adverse effect on speech.