The prevalence of hearing loss among babies in the neonatal intensive care unit in a tertiary hospital in Malaysia

Abstract

Objective: To study the prevalence of hearing loss (HL) and to identify the possible risk factors causing HL. Methods: This retrospective study was conducted from January 2014-December 2016 at a tertiary hospital in Malaysia. All neonates admitted to the neonatal intensive care unit (NICU), Uni-versiti Kebangsaan Malaysia Medical Centre (UKMMC) were screened with a two-step protocol using an automated auditory brain response (AABR) and/or Otoacoustic Emission and auditory brain response (ABR). Descriptive analysis was used for the prevalence of HL, degree of HL and number of risk factors per infant. Results: A total of 2713 babies underwent hearing screening in NICU was enrolled in this study. Two thousand six hundred eight (96%) babies passed the screening test and 214 (4%) babies required further diagnostic test. Only 105 (49%) babies completed diagnostic tests. Out of 105 babies, 40 (38.1%) babies had HL. Mild HL was the commonest HL with 22 (55%), moderate HL was in seven babies (17.5%), severe HL in two babies (5%), and profound HL in nine babies (22.5%). The presence of craniofacial anomalies was the only significant independent risk factor for HL with p<0.05 with an odds ratio of 0.105 CI 95% [0.028-0.389]. Of Babies with the presence of three or more risk factors, 100% of them had HL. There was an increased risk of hearing loss in those with craniofacial anomalies up to 11 times higher compared to those without such anomalies. Conclusion: The prevalence of HL among the NICU babies was 1.5% and mild HL was the commonest degree of HL (55%).