Objective: To describe the natural history of tinnitus in normal hearing patients.
Study design: This is a prospective longitudinal observational study.
Setting: Tertiary University Hospital.
Methods: In 2009 we studied 68 patients with significant tinnitus and normal hearing (Study Group-SG) compared to 46 patients with normal hearing and no tinnitus (Control Group-CG). We have been able to contact and recruit 24 patients from SG (35.3 %) and ten patients from CG) (21.74%) in 2019. Both groups were submitted to conventional audiometry, Distortion Product Otoacoustic Emissions (DPOAE), Tinnitus Handicap Inventory (THI), Visual Analog Scale (VAS) and Beck`S Depression and Anxiety Scales (BDS, BAS). These measures were compared with the same ones performed ten years ago in the same groups of patients. The software SPSS for windows version 21 was used. P values <0.05 were considered significant. Student t test was used to compare SG and CG results in 2019 and to compare 2009 and 2019 outcomes..
Results: Hearing loss, especially in the higher frequencies, were significantly worse in SG compared to GC in 2019. DPOAE were significantly worse in SG and CG in 2019 however CG had more abnormal results than SG. These results suggest that outer hair cells lesions are not the only determinant for tinnitus and hearing loss development.
Conclusions: These results suggest that outer hair cells lesions are not the only determinant for tinnitus and hearing loss development.
Keywords: Hearing loss; Longitudinal study; Tinnitus.