Nonconvulsive status epilepticus (NCSE) is a specific form of status epilepticus and is defined as epileptic activity on an EEG without seizures and as an alteration in mental status lasting more than 30 min. NCSE may be caused by drugs, cerebrovascular events, metabolic disorders or toxins. Herein, we present four cases of patients with drug-induced NCSE who were chronically ill due to renal failure or childhood leukemia. NCSE should be suspected in patients with an altered mental status without clinical seizures who are being treated with multiple drugs.
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