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- Title
Exploration of the Influences of Temporary Velum Paralysis on Auditory-Perceptual, Acoustic, and Tomographical Markers.
- Authors
Maryn, Youri; Zarowski, Andrzej; Loomans, Natalie
- Abstract
Purpose: To better understand hypernasality (HN), we explored the relations between velopharyngeal orifice, auditory perception of HN, and acoustic-spectral measures in an in vivo within-subject design: (a) with a normally functioning velum as the control condition and (b) with a temporarily paralyzed velum as the experimental condition. Method: The velum of eight volunteers was injected with ropivacaine hydrochloride (Naropin) in the area of the levator veli palatini and tensor veli palatini muscles to induce temporary velopharyngeal inadequacy (VPI) and HN. Sustained [a] and [i] and oronasal text readings were recorded, and 3D cone-beam computed tomography images of the vocal tract were built before and during velar anesthesia. Differences between conditions and correlations in normal-to-numb differences between velopharyngeal cross-sectional area (VParea), mean ratings of HN severity, and nine acoustic-spectral measures were determined. Results: Three subjects already had some incomplete velopharyngeal closure in the control condition. Temporary motor nerve blockage of the velum (increased VParea) was accomplished in seven subjects, leading to increased HN and changes in three acoustic-spectral measures. Furthermore, significant correlations only emerged between VParea, HN, and ModelKataoka. Conclusions: In most of the participants, it was possible to temporarily increase the velopharyngeal orifice to investigate HN while controlling other speech variables and cephalic morphology. Although this study was exploratory and its are findings preliminary, it provided additional evidence for the possible clinical value of ModelKataoka, A3-P0, and BF1 for the objective measurement of VPI or HN.
- Subjects
SOFT palate; PARALYSIS; HYPERNASALITY; AUDITORY perception; BIOACOUSTICS; ROPIVACAINE; EFFERENT pathways; VELOPHARYNGEAL insufficiency; RESEARCH; PILOT projects; PHYSIOLOGICAL aspects of speech; IN vivo studies; INJECTIONS; ANESTHESIA; DESCRIPTIVE statistics; INTRACLASS correlation; NOSE diseases; COMPUTED tomography; DATA analysis software; PALATAL muscles
- Publication
Journal of Speech, Language & Hearing Research, 2021, Vol 64, Issue 11, p4149
- ISSN
1092-4388
- Publication type
Article
- DOI
10.1044/2021_JSLHR-20-00587