Objective: To report new sporadic cases and 1 family with epilepsy of infancy with migrating focal seizures (EIMFSs) due to KCNT1 gain-of-function and to assess therapies' efficacy including quinidine.
Methods: We reviewed the clinical, EEG, and molecular data of 17 new patients with EIMFS and mutations, in collaboration with the network of the French reference center for rare epilepsies.
Results: The mean seizure onset age was 1 month (range: 1 hour to 4 months), and all children had focal motor seizures with autonomic signs and migrating ictal pattern on EEG.