Cochlear Implantation and Cognitive Function in Adults: A Systematic Review and Meta-analysis.
Christi A Joyce, Kelly Zhang, Joost J A Stultiens et al.
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In 30 seconds
This systematic review and meta-analysis assessed cognitive test scores before and at least 6 months after cochlear implantation in adults with postlingual hearing loss. Twenty studies included 798 recipients, with testing performed a median of 12 months after implantation. Across all cognitive tests, scores showed a small improvement after implantation (pooled standardized mean difference 0.32 [95% CI: 0.19-0.44]). The MMSE showed no significant change, while the MoCA improved modestly. The authors note that further research is needed to determine whether these test-score changes translate into reduced dementia risk.
Key findings
- Across all cognitive tests, scores improved slightly after implantation (pooled standardized mean difference 0.32 [95% CI: 0.19-0.44]).
- MMSE scores did not change significantly (pooled mean difference, 0.63 [95% CI: -1.02-2.28]).
- MoCA scores showed a small significant increase (pooled mean difference, 1.38 [95% CI: 0.33-2.42]).
Why it matters
Cognitive outcomes are relevant when evaluating the broader effects of cochlear implantation in adults with postlingual hearing loss. The pooled findings suggest modest improvement on some objective cognitive measures, but results differed by test. They do not establish that implantation prevents dementia or that changes in test scores lead to meaningful long-term cognitive benefit.
What to keep in mind
The review combined varied study designs and cognitive tests, and follow-up ranged from 6 to 48 months. The findings concern test scores; whether they translate into reduced dementia risk remains unknown.