title: [Paramedian thalamo-mesencephalic infarct con triphasic waves].
abstract: Triphasic waves are usually associated with metabolic encephalopathies but have been reported in patients with other etiologies. The pathophysiology of this EEG pattern remains poorly understood, although they have been attributed to lesion in the connections between the thalamus and cortex. We report a case of top-of-the-basilar artery occlusion with selective paramedian thalamic-mesencephalic infarct in which triphasic waves were evident on the EEG during clinical hypersomnia. To our knowledge this is the first reported case of triphasic waves with selective paramedian thalamomesencephalic infarct. We conclude that triphasic waves are a nonspecific manifestation of diencephalic dysfunction, probably of the paramedian thalamomesencephalic reticular system.
authors.affiliation: Servicio de Neurología, Hospital Clínico San Carlos, Madrid.
authors.forename: J A
authors.initials: JA
authors.lastname: Egido
authors.forename: R
authors.initials: R
authors.lastname: Arroyo
authors.forename: C
authors.initials: C
authors.lastname: Soriano
authors.forename: J
authors.initials: J
authors.lastname: Espinar
authors.forename: E
authors.initials: E
authors.lastname: Varela de Seijas
mesh_terms: D000368:Aged; D001157:Arterial Occlusive Diseases / Q000150:complications / Q000503:physiopathology; D001488:Basilar Artery / Q000503:physiopathology; D002544:Cerebral Infarction / Q000175:diagnosis / Q000503:physiopathology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008636:Mesencephalon / Q000503:physiopathology*; D013788:Thalamus / Q000503:physiopathology*
vernacular_title: Infarto talamomesencefálico paramediano con ondas trifásicas.