Nonconvulsive status epilepticus (NCSE) may not be at the first look considered a manifestation of epilepsy and making this diagnosis is generally more difficult than of a convulsive status. Nonconvulsive SE is characterised by a sudden change in cognitive functions or behaviour, which lasts at least 30 minutes, whereas epileptic manifestations are of different nature, may be accompanied by qualitative or quantitative change of consciousness of a different degree and EEG examination demonstrates epileptic seizing activity. Three criteria are important for making the diagnosis of NCSE: 1. prolonged impairment of consciousness or behaviour lasting longer than 30 minutes, 2. abnormal EEG recording with occurrence of epileptiform waveforms, changed against the interictal EEG recording, 3. an obvious effect of parenteral antiepileptic drug therapy. The following four case reports present the issue of NCSE, including example EEG recordings.

        Key words: nonconvulsive status epilepticus, absence status epilepticus, partial complex status epilepticus. EEG