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Leitinger M., Beniczky S., Rohracher A. Affair with triphasic waves - their striking presence, mysterious significance, and cryptic origins: what are they? J Clin Neurophysiol 2015 32: 401–405. Classification and clinical significance. American Clinical Neurophysiology Society’s Standardized Critical Care EEG Terminology: 2012 version. Atlas and classification of electroencephalography. Hepatic encephalopathy revisited: beyond the triphasic waves. Triphasic waves: swinging the pendulum back in this diagnostic dilemma. EEG monitoring must be performed in patients with a sudden deterioration of consciousness that cannot be explained by brain imaging studies. Utilization of the modern clinical and electrographic classifications enables the diagnosis of a nonconvulsive epileptic seizure and status epilepticus when the EEG pattern is ambiguous and traditionally associated with other conditions. Proper selection of the antiepileptic drugs along with monitoring of daily EEG recordings led to a recovery of consciousness in the patient and to normalization of the EEG pattern, which confirmed the clinical hypothesis of a nonconvulsive status epilepticus.Ĭonclusions. Description of the patient’s EEG according to the classification of rhythmic and periodic patterns of the American Clinical Neurophysiology Society and the use of clinical and EEG criteria of nonconvulsive status epilepticus of the International League Against Epilepsy enabled us to correctly diagnose the cause of her decreased alertness and other neurological symptoms. We present a case of diagnosis and successful treatment of a nonconvulsive status epilepticus, that developed in a female patient after CABG, and that presented electrographically as a triphasic wave pattern. The development of digital technologies and the introduction of systems that allow long-term EEG monitoring of the neurocritical care patients has led to accumulation of significant experience in recording triphasic waves in various metabolic, toxic, and structural brain disorders, as well as in nonconvulsive status epilepticus. Triphasic waves in an electroencephalogram (EEG) in patients with decreased alertness traditionally is associated with hepatic encephalopathy.