"It is noteworthy that epilepsy occurred in some patients with FTD already ten years before their dementia diagnosis," Kilpeläinen noted, adding that the prevalence was higher at every stage of the disease than what has been reported in previous international literature. The study assessed prevalence at multiple intervals, ranging from a decade prior to the diagnosis to five years after. As the disease progressed, so did the frequency of epilepsy; five years post-diagnosis, approximately 11% of FTD patients were found to have epilepsy.
The researchers also looked beyond formal epilepsy diagnoses, examining the use of anti-epileptic medications among the patient groups. They found that these medications were significantly more common in the FTD group, a factor that reinforces the reliability of the study’s conclusions. The correlation between the medication data and the diagnostic records provides a robust evidence base, suggesting that the higher prevalence is not a statistical anomaly but a widespread clinical reality.
Epilepsy might be left undiagnosed
The intersection of FTD and epilepsy presents a unique set of diagnostic hurdles. In a clinical setting, identifying seizures in a patient who is already experiencing the cognitive and behavioral shifts associated with FTD is notoriously difficult. The symptoms of frontotemporal dementia—such as sudden behavioral outbursts, repetitive movements, or transient lapses in communication—can closely mimic the presentation of certain types of epileptic seizures.
This symptomatic overlap often leads to a "masking" effect, where seizures are dismissed as part of the behavioral symptoms of dementia. Consequently, many patients may suffer from undiagnosed and untreated epilepsy for years. The danger of this oversight cannot be overstated; untreated epilepsy can lead to further cognitive decline, physical injury, and a more rapid deterioration of the patient’s overall health.
"Identifying epilepsy is important because its treatment can improve patients’ functional capacity and quality of life," explained Associate Professor Eino Solje, the project’s principal investigator and Director of the University of Eastern Finland (UEF) Brain Research Unit. When seizures are controlled through appropriate medication and management, the heavy burden of the disease can be somewhat alleviated, allowing patients to maintain their independence and engagement with their surroundings for a longer period.
Beyond the immediate clinical benefits of better diagnosis, the study opens up profound new avenues for scientific inquiry. The strong association between these two conditions suggests that they may share more than just a chronological link. Solje pointed out that the findings raise critical questions about the "pathophysiological mechanisms" at play in the brain. It is possible that the neurodegeneration seen in FTD and the electrical instability seen in epilepsy are driven by the same underlying cellular or molecular changes.
