ABSTRACT
Purpose
To characterize the acquisition parameters, analysis, and results of the frequency-following response (FFR) in cochlear implant users.
Research strategies
The search was conducted in Cochrane Library, Latin American and Caribbean Health Sciences Literature (LILACS), Ovid Technologies, PubMed, SciELO, ScienceDirect, Scopus, Web of Science, and gray literature.
Selection criteria
Studies on FFR in cochlear implant users or that compared them with normal-hearing people, with no restriction of age, were included. Secondary and experimental studies were excluded. There was no restriction of language or year of publication.
Data analysis
The data were analyzed and reported according to the stages in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), 2020. The methodological quality was analyzed with the Joanna Briggs Institute Critical Appraisal Checklist for Analytical Cross-Sectional Studies. Divergences were solved by a third researcher.
Results
Six studies met the inclusion criteria. Only one study was comparative, whose control group comprised normal-hearing people. The variations in acquisition parameters were common and the analysis predominantly approached the time domain. Cochlear implant users had different FFR results from those of normal-hearing people, considering the existing literature. Most articles had low methodological quality.
Conclusion
There is no standardized FFR acquisition and analysis protocol for cochlear implant users. The results have a high risk of bias.
Keywords
Cochlear Implant; Evoked Potentials Auditory Brain Stem; Speech; Auditory Perceptual Disorders; Electrophysiology; Review
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