Purpose: To describe the audiological and electrophysiological results in patients with spinocerebellar ataxia (SCA).
Methods: Retrospective and cross-sectional studies were performed. Forty-three patients were assessed using the following procedures: anamnesis and otolaryngologic exam, pure tone audiometry, acoustic immittance measures and brainstem auditory evoked potential (BAEP).
Results: Patients showed gait abnormality (83.7%), speech disorder (48.8%), dizziness (41.8%) and dysphagia (39.5%). Hearing loss was referred in 27.9% of the cases; in the audiometric exams, 14 patients (32.5%) presented disorders; in SCA 3, 33.3%; in SCA 2, 12.5%; in SCA 4, 100.0%; in SCA 6, 100.0%; in SCA 7, 100.0%; in SCA 10, 50.0%; and in undetermined SCA, 21.4%. In BAEP, 20 patients (46.5%) were abnormal, being 58.3% in SCA 3, 62.5% in SCA 2, 100.0% in SCA 6, 100.0% in SCA 7, 66.7% in SCA 10 and 14.2% in undetermined SCA. While in acoustic immittance, 19 patients (44.1%) presented disorders, being 50.0% in SCA 3, 50.0% in SCA 2, 100.0% in SCA 4, 100.0% in SCA 6, 100.0% in SCA 7, 33.3% in SCA 10 and 28.5% in undetermined SCA.
Conclusion: The most evident abnormalities in the audiological evaluation were the predominance of the down-sloping audiometric configuration beginning at 4 kHz bilaterally and the bilateral absence of acoustic reflex at the frequencies of 3 and 4 kHz. In the electrophysiological evaluation, 50% of the patients showed abnormalities with prevalence of an increase of the latency of waves I, II and V and of the interval in the interpeaks I-III, I-V and III-V.
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