STUDY OF PREVALENCE AND PATTERN OF HEARING LOSS IN PATIENTS OF HEPATITIS B

Abstract

Hepatitis B has been documented to cause various extra hepatic manifestations along with known hepatic complications. It has been reported that hepatitis-B patients are more susceptible to inner ear damage and hearing loss. The aim of this study is to evaluate hearing loss among patients of   hepatitis B {all 6 categories Hepatitis B infection: chronic Hepatitis B  infection , hepatitis B cirrhosis ,Hepatitis B virus carriers , occult chronic Hepatitis B and Hepatitis B infection with poly arthritis nodosa, hepato cellular carcinoma with hepatitis B}compared with healthy subjects.

METHOD: In this case control study 100 Hepatitis B positive patients and 100 age and gender-matched healthy individuals were included over the period of 5 years. All of them were known cases of chronic hepatitis B positive for   HBsAg at least for 18 months. All   patients were aged 18 to 50 years to exclude presence of presbycusis. After base line investigations, they were subjected for all cases and controls were subjected otoscopic examination and hearing assessment using standard pure tone audiometry. Descriptive statistical analysis has been carried out in this study.

RESULT: In patients of Hepatitis B (94 patients,6 patients had of  natural death ) pure tone average (mean thresholds 250,500, 1000,2000,4000 &8000 Hz) was 28.4 dB in the right ear and 27.3 dB in the left (hearing loss).In the control group(96 patients,4 patients dropped out), PTA average was 9.9 dB in the right ear and 9.3dB in the left (normal hearing). In both groups, Speech Discrimination score (SDS) was100% in both ears. The percentage of hearing loss in the right and left ear over the total of six frequencies differed significantly in the two groups. Out of 94 patients of control group, 38 patients (40.4%) patients presented with Chronic Liver Disease (CLD), 14 patients (14.8%) patients presented with cirrhosis with Hepatitis B, 6 (6.3%) patients had Poly arthritis Nodosa with Hep-B, 18(19.1%) patients were diagnosed as carrier of Hepatitis-B , 11(11.7%) patients had occult Hepatitis-B and 7(7.4%) patients were diagnosed with hepato cellular carcinoma.

Hearing loss was maximum in patients of   PAN with Hep-B. Second highest mean SNHL was seen in patients of Hep-B with cirrhosis .Third highest mean hearing loss was noted in patients with HCC .Forth highest mean hearing loss was noted in patients with occult Hep-B. Fifth highest mean hearing loss was noted in carriers of Hep-B.Lowest group with SNHL was chronic liver disease.

CONCLUSION: Regular audiometric tests are recommended for patients with HBV infection to assess their hearing ability and enable the earlier detection of SNHL. We also suggest that HBV presenting with the sudden onset of hearing loss should be examined for the possibility of acute exacerbation of chronic HBV infection.

KEYWORDS: Mean, Sensorineural, Hearing loss, Cirrhosis.