David Carpenter1, David Kaylie1, Erin Piker1, Dennis Frank-Ito1,2,3. 1. Division of Head and Neck Surgery & Communication Sciences, Duke University Medical Center, Durham, NC. 2. Computational Biology & Bioinformatics PhD Program, Duke University, Durham, NC. 3. Department of Mechanical Engineering & Materials Science, Duke University, Durham, NC.
Abstract
PURPOSE: This study assesses interaural differences in temporal bone anatomy in subjects with normal caloric findings. METHOD: Eligible patients included those referred to the Duke University Medical Center otology clinic complaining of dizziness, with a head computed tomography scan and caloric stimulation results within normal ranges (inter-ear difference ≤ 10% or < 25% unilateral weakness). Three-dimensional reconstructions of computed tomography scans in 11 patients were used to calculate the surface area and volume of lateral semicircular canals (LSCCs), mastoid airspaces, mastoid bones, and internal auditory canal diameter and circumference. Percent differences in interaural temporal bone anatomy (i.e., left-to-right asymmetry) were analyzed and correlated with warm caloric inter-ear difference (WCD) and clinically indicated caloric predictor asymmetry. RESULTS: A multivariate model predicting WCD from 9 interaural anatomic variables demonstrated a Pearson's coefficient of 0.999. A similarly constructed model of the clinically indicated caloric predictor demonstrated a Pearson's coefficient of 0.999. The univariate correlation was strongest for WCD versus Proctor internal auditory canal diameter (r = 0.476; p = .139) and WCD versus lateral semicircular canal surface-area-to-volume ratio (r = -0.474; p = .141). CONCLUSIONS: This pilot study provides multivariate models that predict caloric asymmetry in subjects without vestibular pathologic findings per caloric testing, based on interaural differences across variables of the temporal bone anatomy. SUPPLEMENTAL MATERIAL: https://doi.org/10.23641/asha.5895988.
PURPOSE: This study assesses interaural differences in temporal bone anatomy in subjects with normal caloric findings. METHOD: Eligible patients included those referred to the Duke University Medical Center otology clinic complaining of dizziness, with a head computed tomography scan and caloric stimulation results within normal ranges (inter-ear difference ≤ 10% or < 25% unilateral weakness). Three-dimensional reconstructions of computed tomography scans in 11 patients were used to calculate the surface area and volume of lateral semicircular canals (LSCCs), mastoid airspaces, mastoid bones, and internal auditory canal diameter and circumference. Percent differences in interaural temporal bone anatomy (i.e., left-to-right asymmetry) were analyzed and correlated with warm caloric inter-ear difference (WCD) and clinically indicated caloric predictor asymmetry. RESULTS: A multivariate model predicting WCD from 9 interaural anatomic variables demonstrated a Pearson's coefficient of 0.999. A similarly constructed model of the clinically indicated caloric predictor demonstrated a Pearson's coefficient of 0.999. The univariate correlation was strongest for WCD versus Proctor internal auditory canal diameter (r = 0.476; p = .139) and WCD versus lateral semicircular canal surface-area-to-volume ratio (r = -0.474; p = .141). CONCLUSIONS: This pilot study provides multivariate models that predict caloric asymmetry in subjects without vestibular pathologic findings per caloric testing, based on interaural differences across variables of the temporal bone anatomy. SUPPLEMENTAL MATERIAL: https://doi.org/10.23641/asha.5895988.
Authors: Hollin E Calloway; Julia S Kimbell; Stephanie D Davis; George Z Retsch-Bogart; Elizabeth A Pitkin; Kathleen Abode; Richard Superfine; Carlton J Zdanski Journal: Laryngoscope Date: 2013-09 Impact factor: 3.325