Assessment of Cochlear Function Among Hypertensive Patients in Bauchi: A Cross-Sectional Cohort Study

Background: Hypertension is an important public-health problem, and it has been identified as the leading cause of morbidity and mortality due to the high incidence of end-organ damages. Unlike other complications of hypertension, cochlear dysfunction in hypertensive patients is a hidden and progressive damage that remains undetected (subclinical) for a long time. The aim of this study was to assess the prevalence of subclinical hearing impairment, as well as the type and degree of hearing loss among hypertensive patients in our environment. Methods: This was a cross-sectional cohort study conducted among adults diagnosed with hypertension previously. Ethical clearance and informed consent were obtained. Previous history of related exposure event (hypertension) and outcome (hearing loss) was assessed. Each participant was then subjected to c-PTA and EHA tests, and findings were analyzed. Results: One hundred and ninety (190) hypertensive patients were enrolled, among which 107 (56.3%) were females and 83 (43.7%) males. Hypertension was more common in the age group of 51-60 years (26.8%) and 61-70 years (30.5%). The overall prevalence of hearing loss was 41.6%, of which 18.4% had subclinical hearing impairment. The most common type of hearing loss was sensorineural 68 (86.1%), found to be in varying degrees of 33.8%, 26.5%, 23.5%, and 16.2% for mild, moderate, severe, and profound hearing loss, respectively. Conclusion: The overall prevalence of hearing loss among hypertensive patients was 41.6%, with a significant proportion (18.4%) having subclinical hearing loss, which is not noticed by the patients. Therefore, routine pure tone audiometric hearing screening for all hypertensives is recommended to enable early detection and treatment of this hearing loss.