Publication date: Available online 7 June 2017
Source:American Journal of Otolaryngology
Author(s): Lucy Meyer, Bazak Sharon, Tina C. Huang, Abby C. Meyer, Kristin E. Gravel, Lisa A. Schimmenti, Elizabeth C. Swanson, Hannah E. Herd, Nelmary Hernandez-Alvarado, Kirsten R. Coverstone, Mark McCann, Mark R. Schleiss
PurposeCongenital cytomegalovirus (cCMV) infection is the most common non-genetic cause of sensorineural hearing loss (SNHL). However, accurate diagnosis of cCMV as the etiology of SNHL is problematic beyond the neonatal period. This study therefore examined whether cCMV infection could be identified retrospectively in children presenting with unexplained SNHL to a multidisciplinary diagnostic outpatient otolaryngology clinic at an academic medical center in Minnesota.MethodsOver a 4-year period, 57 patients age 3months to 10years of age with unexplained SNHL were recruited to participate in this study. Informed consent was obtained to test the archived dried blood spots (DBS) of these patients for cCMV infection by real-time PCR, targeting a highly conserved region of the CMV UL83 gene. Results were normalized to recovery of an NRAS gene control. Chart review was conducted to identify subjects who underwent genetic testing and/or neurodiagnostic imaging to investigate possible genetic, syndromic, or anatomical causes of SNHL.ResultsIn total, 15 of the 57 children with unexplained SNHL tested positive for CMV DNA in their DBS (26%). A mean viral load of 8.3×104 (±4.1×104) [range, 1×103–6×105] copies/μg DNA was observed in subjects retrospectively diagnosed with cCMV. No statistically significant correlation was found between viral load and SNHL severity.ConclusionsA retrospective DBS analysis demonstrated 26% of patients presenting with unexplained SNHL in childhood had cCMV. DBS testing is useful in the retrospective diagnosis of cCMV, and may provide definitive diagnostic information about the etiology of SNHL.
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