Nonconvulsive Status Epilepticus and Encephalopathy Related to Ifosfamide – A Case Report

Abstract

Introduction: Ifosfamide (IFX) is an alkylating drug used for chemotherapy to manage a wide range of malignancies including testicular, ovarian, head-and-neck cancers, lymphomas, and sarcomas. Central nervous system (CNS) toxicity is known to occur in 10%–40% of patients who are administered high doses of IFX. CNS toxicity includes an encephalopathy with underlying nonconvulsive status epilepticus manifesting with altered sensorium, mental confusion, seizures, ataxia, visual hallucinations, akinetic mute state extrapyramidal features, or coma. Case Report: We describe the case of a 65-year-old woman with a rapidly evolving confusional state and progressive decline in the fluency of speech progressing to mutism immediately after IFX chemotherapy. Results: Electroencephalogram (EEG) revealed evidence of nonconvulsive status epilepticus. The patient was managed with anticonvulsants, discontinuing IFX, and intravenous methylene blue infusion. Subsequently, the patient had significant improvement to an alert state with normalization of EEG abnormality. Conclusion: CNS toxicity following IFX usually manifests within 24 h of the drug administration, although clinical manifestations of toxicity may occur up to 4–6 days and a significant number of these patients may have a nonconvulsive status as the cause of the encephalopathy. Patients with encephalopathy following IFX should be evaluated with early EEG to assess for the presence or absence of a nonconvulsive status. Patients with a positive EEG would benefit from prompt and aggressive anticonvulsant therapy along with cessation of IFX therapy with or without intravenous methylene blue administration.