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Velopharyngeal Incompetence in Children With 22q11.2 Deletion Syndrome: Velar and Pharyngeal Dimensions.
Journal of Craniofacial Surgery 2021 March
ABSTRACT: The surgical management of velopharyngeal incompetence (VPI) in children with 22q11.2 deletion syndrome (22q11.2 DS) is challenging. There are numerous approaches and children often undergo more than one operation. Our aim was to develop a method using images from routine lateral videofluoroscopy to study the dimensions of the velopharynx in this cohort.We analyzed 22 pre-operative lateral videofluoroscopy recordings of children with 22q11.2 DS and VPI. Fourteen had a submucous cleft palate (SMCP) and 8 had no obvious palatal abnormality but who were subsequently labelled as having an occult submucous cleft palate (OSMCP). The control data were 10 historic records of children with cleft lip and an intact palate. The authors identified key points on radiographs of the velum at rest and when elevated to measure the total velar length, functional velar length and pharyngeal depth and compared them ratiometrically.The intra-observer reliability was > 0.9 whereas the inter-observer reliability was > 0.74. The velopharyngeal depth/total velar length was significantly greater in 22q11.2 DS than the control group P < 0.001. There was no difference between SMCP and OSMCP patients, P = 0.556. There was no difference in the functional velar length/total velar length between 22q11.2 DS and controls (P = 0.763).In this study, the authors demonstrate a reliable method to gain useful ratiometric measurements of the velopharynx. This may help with treatment planning. Children with 22q11.2 DS and VPI have a larger velopharyngeal depth/total velar length ratio that may explain some of the difficulty in management.
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