Overview
- Researchers presented the finding at the European Academy of Neurology Congress in late June after analysing matched records from the TriNetX network of more than 250 million patients.
- Among adults who have both epilepsy and hearing loss, hearing-aid use was associated with a 23% lower relative risk of dementia and a 2.7 percentage-point absolute reduction over five years, equal to about one fewer case per 37 people treated.
- The association was specific to the epilepsy subgroup and was not seen across the overall hearing-loss population or in groups with stroke, migraine, type 2 diabetes, chronic kidney disease, heart failure or osteoarthritis.
- Investigators propose a plausible mechanism: epilepsy can reduce cognitive reserve and certain seizure types or antiseizure drugs may affect brain areas tied to hearing, so fixing hearing loss could remove an added cognitive burden.
- The study is observational and cannot prove cause; researchers urge routine hearing screening for people with epilepsy and call for prospective trials to confirm whether hearing aids directly lower dementia risk and to measure long-term benefit.