Hearing Loss in Children With Asymptomatic Congenital Cytomegalovirus Infection.

ABSTRACT

OBJECTIVES: To assess the prevalence, characteristics, and risk of sensorineural hearing loss (SNHL) in children with congenital cytomegalovirus infection identified through hospital-based newborn screening who were asymptomatic at birth compared with uninfected children. METHODS: We included 92 case-patients and 51 controls assessed by using auditory brainstem response and behavioral audiometry. We used Kaplan-Meier survival analysis to estimate the prevalence of SNHL, defined as ≥25 dB hearing level at any frequency and Cox proportional hazards regression analyses to compare SNHL risk between groups. RESULTS: At age 18 years, SNHL prevalence was 25% (95% confidence interval [CI] 17%-36%) among case-patients and 8% (95% CI 3%-22%) in controls (hazard ratio [HR] 4.0; 95% CI 1.2-14.5; P = .02). Among children without SNHL by age 5 years, the risk of delayed-onset SNHL was not significantly greater for case-patients than for controls (HR 1.6; 95% CI 0.4-6.1; P = .5). Among case-patients, the risk of delayed-onset SNHL was significantly greater among those with unilateral congenital/early-onset hearing loss than those without (HR 6.9; 95% CI 2.5-19.1; P < .01). The prevalence of severe to profound bilateral SNHL among case-patients was 2% (95% CI 1%-9%). CONCLUSIONS: Delayed-onset and progression of SNHL among children with asymptomatic congenital cytomegalovirus infection continued to occur throughout adolescence. However, the risk of developing SNHL after age 5 years among case-patients was not different than in uninfected children. Overall, 2% of case-patients developed SNHL that was severe enough for them to be candidates for cochlear implantation.