Purpose Congenital 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. Methods Over a 4-year period, 57 patients with an age range of 3 months to 10 years 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. Results In 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. Conclusions A retrospective DBS analysis demonstrated that 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.
|Original language||English (US)|
|Number of pages||6|
|Journal||American Journal of Otolaryngology - Head and Neck Medicine and Surgery|
|State||Published - Sep 2017|
Bibliographical noteFunding Information:
Funding for this study was provided by March of Dimes #6-FY06-336 (to LAS and MRS), a Thrasher Foundation New Research Award Program Grant (to BS), a University of Minnesota Vikings Children's Fund Award (?If You Don't Pass, Screen?), and a Children's Hospitals of Minnesota Internal Research Grant Program award. Support of the Lions Children's Hearing Center from the Lions Multiple District 5M Hearing Foundation is gratefully acknowledged. The contributions of Drs. Frank Rimell and K. Yeon Choi in the early stages of this study are noted. No declared conflicts of interest.
© 2017 Elsevier Inc.