Acoustic and perceptual aspects of vocal function in children with adenotonsillar hypertrophy —effects of surgery
2012 (English)In: Journal of Voice, ISSN 0892-1997, E-ISSN 1557-8658, Vol. 26, no 4, 480-487 p.Article in journal (Refereed) Published
Objective: To evaluate outcome of two types of tonsil surgery (tonsillectomy+adenoidectomy or tonsillotomy +adenoidectomy) on vocal function perceptually and acoustically.
Study Design: Sixty-seven children, aged 50-65 months, on waiting list for tonsil surgery were randomized to tonsillectomy (n=33) or tonsillotomy (n=34). Fifty-seven age and gender matched healthy pre-school children were controls. Twenty-eight of them, aged 48-59 months, served as control group before surgery, and 29, aged 60-71 months, after surgery
Methods: Before surgery and six months postoperatively, the children were recorded producing three sustained vowels (/A, u, i/) and 14 words. The control groups were recorded only once.
Three trained speech and language pathologists performed the perceptual analysis using Visual Analogue Scales (VAS) for eight voice quality parameters. Acoustic analysis from sustained vowels included average fundamental frequency, jitter percent, shimmer percent, noise-to-harmonic ratio and the centre frequencies of formants 1-3
Results: Before surgery the children were rated to have more hyponasality and compressed/throaty voice (p<0,05) and lower mean pitch (p<0,01) in comparison to the control group. They also had higher perturbation measures and lower frequencies of the second and third formant. After surgery there were no differences perceptually. Perturbation measures decreased but were still higher compared to the control group’s, p<0, 05. Differences in formant frequencies for /i/ and /u/ remained. No differences were found between the two surgical methods.
Conclusion: Voice quality is affected perceptually and acoustically by adenotonsillar hypertrophy. After surgery the voice is perceptually normalized but acoustic differences remain. Outcome was equal for both surgical methods.
Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 26, no 4, 480-487 p.
Voice quality; children; perceptual and acoustic analyses; tonsil surgery
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-61240DOI: 10.1016/j.jvoice.2010.11.003ISI: 000305961500018ISBN: 978-91-7393-333-9OAI: oai:DiVA.org:liu-61240DiVA: diva2:361147