ABSTRACT
Purpose
to investigate the hearing of children with microcephaly due to congenital Zika virus syndrome.
Methods
the sample consisted of eleven children with microcephaly due to the congenital Zika virus syndrome. The collection was carried out in the first semester of 2017 until the first semester of 2018. Procedures performed: otorhinolaryngological and audiological evaluation: observation of auditory behavior and visual reinforcement audiometry; immittance testing, transient evoked otoacoustic emissions, brainstem auditory evoked potential, and auditory steady-state evoked potential with narrow band CE-chirp stimulus. The behavioral responses were compared with the responses of the auditory steady-state evoked potential.
Results
eleven children presented responses as expected for age in the behavioral assessment, with 20 dB bilaterally for tones calibrated in the field at frequencies of 500 Hz, 1kHz, 2 kHz, 4 kHz, with 2 children being able to perform field audiometry with bilateral earphone insertion. Regarding the transient evoked otoacoustic emissions, all presented responses in both ears, ten children had tympanometry type A and one had type Ar tympanometry. Regarding the auditory evoked potential, 8 children had results within the normal range, with a minimum level of response at 20 dBnHL bilaterally. In the auditory steady-state evoked potential, 6 children had a minimum response level of 500 Hz, 1 kHz, 2 kHz, and 4 kHz, bilaterally, at 20 dBnHL.
Conclusion
the children did not present sensorineural hearing loss.
Keywords:
hearing; hearing loss; evoked potentials; microcephaly; Zika virus