[Tinnitus features and masking in patients with normal hearing and with high frequency hearing loss].

Objective: To access tinnitus features and effectiveness of its masking in relation to sensorineural hearing loss (SHL), gender, age, affected side and tinnitus pitch.

Material and methods: 53 patients (32 (60.4%) females and 21 (39.6%) males) aged 20 to 46 years with unilateral chronic tinnitus without any external or middle ear pathology were enrolled in the study. All patients underwent pure tone audiometry, evaluating SHL, tinnitus pitch and tinnitus masking. Pure-tone thresholds were measured at all standard frequencies from 0.25 to 8 kHz, and at 10 kHz, 12.5 kHz, 14 kHz, 16 kHz, and 20 kHz.

Results: Normal hearing at the studied frequencies was observed in 24 patients, and 29 patients were found to have SHL. Patients with high-frequency SHL identified tinnitus pitch more often identified tinnitus pitch compared to those with normal hearing (75.9% vs. 45%, respectively; p=0.02). Tinnitus pitch in patients with normal hearing was 8 (6-13) kHz, whereas in all patients with SHL tinnitus pitch was always located in the range of maximum hearing loss and reached 10 (8-12) kHz. The mean tinnitus pitch, which was successfully masked, was 8 Hz, and tinnitus pitches with mean value above 12 kHz were not associated with effective masking (p=0.04). No statistically significant differences were found between the effectiveness of tinnitus masking and the affected side, gender, presence of SHL. The higher tinnitus pitch (above 12 kHz) was more common in younger patients and was associated with less successful masking.

Conclusion: Our study included patients of predominantly young age (up to 48 years old), in whom, probably, the factors influencing the tinnitus characteristic differ and have a correlation with anxiety-depressive spectrum disorders prevailing at a younger age. In this regard, further research is needed.