Status epilepticus is caused by CNS illnesses and diseases. In status epilepticus, hypersynchronous epileptic activity lasts longer than isolated self-limited seizures (time t1), which produces neuronal injury or modification of neuronal networks at a given time point (time t2). Successful status epilepticus care entails early seizure cessation and early identification of a causal etiology, which may necessitate immediate treatment. In nonconvulsive status epilepticus, patients may have no apparent symptoms. EEG can assess cerebral function and identify patterns requiring urgent treatment.