Assessment of the feeding Swallowing Impact Survey as a quality of life measure in children with laryngeal cleft before and after repair.

OBJECTIVE: To cross-validate the Feeding Swallowing Impact Survey (FSIS), a quality of life instrument, specifically to a subpopulation of children who aspirate due to laryngeal cleft. INTRODUCTION: The FSIS is a recently validated instrument used to describe caregiver quality of life (QOL) in children with aspiration due to various causes. To cross-validate the FSIS specifically to the subpopulation of children who aspirate due to laryngeal cleft, we tested the hypotheses that caregivers would report significant different scores form baseline if their children improved at the one year mark postintervention due to either successful conservative or surgical measures (discriminant validity) and would not report significant differences in their FSIS reporting if there was no change in their child's aspiration at the one year mark post intervention (convergent validity). METHODS: The FSIS was administered to the caregivers of 35 children (19 male, 16 female; age range: 5-79 months) who aspirate secondary to known laryngeal cleft (diagnosed by suspension laryngoscopy and inspection). All children had a baseline VFSS demonstrating aspiration and documenting what feeding plan to follow and caregivers completed the FSIS at this point as well. All children regardless of whether they were treated by conservative or surgical intervention underwent a follow-up VFSS at the one year post-intervention mark and the caregivers completed a FSIS at this time point as well. RESULTS: Among two distinct sub-populations of children who underwent either successful conservative or surgical treatment for their laryngeal cleft and demonstrated improvement at the one year mark (as defined by a VFSS documented decreased need for thickener by at least one consistency or more) and where we hypothesized that FSIS scores would not be significantly different, the caregivers reported no significant differences in FSIS scores cleft repair (mean FSIS scores 2.45 (SD 0.88)/2.1 (SD 0.94); p = 0.28). Moreover, as another test to convergent validity, for children who underwent either unsuccessful conservative treatment (and subsequently went on to need surgery) or who were not successfully surgically treated for their laryngeal cleft and demonstrated no significant improvement at the one year mark (as defined by a VFSS documented decreased need for thickener by at least one consistency or more), the caregivers reported no significant differences in FSIS scores cleft repair (mean FSIS scores 2.8(SD 0.79)/2.5(SD 0.88); p = 0.69). For divergent validity, two distinct sub-populations of children who underwent either successful or not successful surgical treatment for their laryngeal cleft (demonstrated by either improvement or lack of improvement at the one year mark VFSS as defined by a decreased need for thickener by at least one consistency or more) revealed significant differences in caregiver FSIS scores cleft repair (mean FSIS scores 1.38 (SD 0.32); 32.8 (SD 0.79); p=<0.0002). DISCUSSION: This results of this study provide convergent and divergent validity supporting the cross-validation of the FSIS instrument to be utilized as a validated QOL instrument to evaluate children with aspiration specifically due laryngeal cleft as another tool with which to evaluate the outcomes of medical or surgical interventions for this disorder.