Unverricht-Lundborg disease: Clinical course and seizure management based on the experience of polish centers

Abstract The purpose of this paper was to present our experience following the longterm treatment of 11 patients with Unverricht-Lundborg disease (ULD) confirmed by molecular testing. Methods We analyzed the clinical course, cognitive state, neuroimaging and neurophysiology results. Results The data were collected from 9 unrelated families (F/M: 4/7) aged 25-49. The most frequent early manifestations of ULD include generalized tonic-clonic seizures (GTCS) accompanied by myoclonus 2 years later. Myoclonus was observed in all of the patients; its severity made it impossible for 91% to move independently. In two patients- mild atrophy of brain were observed in the MRI. More than half of the patients who underwent evoked potential presented no abnormalities. The dominant EEG-change was slow background activity in all of the patients. Seven patients had generalized seizure activity. The patients received antiepileptic therapy modifications depending on the severity of symptoms and stage of the disease. Five patients received N-acetyl-cysteine. Conclusions ULD patients require anti-epileptic polytherapy, mostly benefitting from managing GTCS and myoclonus with valproic acid and clonazepam treatment. Patients may benefit from add-on therapy with levetiracetam or topiramate. An increase in myoclonus, resulting from the progressive nature of the disease leads to significant disability in the majority of patients.