Clinical Report: Epilepsy Study Maps Down Syndrome Course
Overview
A multicenter observational study reveals that epilepsy prevalence in adults with Down syndrome increases significantly with age, particularly following symptomatic Alzheimer's disease. The study analyzed data from 4,804 adults, highlighting a cumulative incidence of late-onset myoclonic epilepsy in Down syndrome (LOMEDS) and its association with cognitive decline and increased mortality risk.
Background
Individuals with Down syndrome have a heightened risk of developing Alzheimer's disease due to genetic factors. This study explores the relationship between Down syndrome, Alzheimer's disease, and the incidence of epilepsy.
Data Highlights
| Age Group | Epilepsy Prevalence (per 1,000) |
|---|---|
| 18-24 years | 39 |
| 60 years or older | 390 |
| Asymptomatic Alzheimer's | 121 |
| Symptomatic Alzheimer's | 459 |
Key Findings
- Active epilepsy was identified in 15% of the 4,804 adults with Down syndrome studied.
- Prevalence of epilepsy increased from 39 per 1,000 in ages 18-24 to 390 per 1,000 in those aged 60 and older.
- Cumulative incidence of LOMEDS increased from 10% at Alzheimer's diagnosis to 57% at 9 years post-diagnosis.
- Myoclonic and generalized tonic-clonic seizures were the most frequently observed seizure types.
- Patients with symptomatic Alzheimer's disease without LOMEDS experienced a cognitive decline of 3.6 points per year, which accelerated to 7.8 points per year after seizure onset.
Clinical Implications
The findings suggest that clinicians should monitor adults with Down syndrome for the onset of epilepsy, especially as they age and if they develop Alzheimer's disease.
Conclusion
This study highlights the relationship between Down syndrome, Alzheimer's disease, and epilepsy.
Related Resources & Content
- MDSpire News, Source, 2026 -- Common Genes Drive Epilepsy Severity in Families
- Acta Neuropathologica, Source, 2026 -- Neuropathological measures of increased tau phosphorylation across the Down syndrome lifespan
- Acta Neuropathologica, Source, 2026 -- Frequency of mixed neuropathologies in individuals with down syndrome with and without Alzheimer's dementia
- Natural history and clinical impact of epilepsy in adults with Down syndrome: a multicentre clinical study - PubMed, 2026
- Progressive myoclonus epilepsy in Down syndrome with Alzheimer's disease: An 11‐year longitudinal study and proposed diagnostic red flags - Epilepsia Open, 2026
- Overview | Epilepsies in children, young people and adults | Guidance | NICE, 2025
- the pathologist — WGS Unravels Idiopathic Epilepsy
- Natural history and clinical impact of epilepsy in adults with Down syndrome: a multicentre clinical study - PubMed
- Progressive myoclonus epilepsy in Down syndrome with Alzheimer's disease: An 11‐year longitudinal study and proposed diagnostic red flags - d'Orsi - 2026 - Epilepsia Open - Wiley Online Library
- Overview | Epilepsies in children, young people and adults | Guidance | NICE
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