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Brain mapping analysis in patients with hepatic encephalopathy
Authors:Teresa Sagalés  Victor Gimeno  M. Dolores de la Calzada  Francesc Casellas  M. Dolors Macià  M. Villar Soriano
Affiliation:(1) Servicio de Neurofisiologia Clinica, Hospital General Vall d'Hebron, Pg. Vall d'Hebron s/n., 08035 Barcelona, Spain
Abstract:Summary Topographical analysis of cerebral electrical activity was performed in 44 patients with hepatic encephalopathy. These patients were classified in 5 groups according to clinical criteria. Eight healthy subjects were used as a control group. All were studied in an awake, eyes closed, condition and some [Control Group (CG), Group 0 (G0), Group 1 (G1) and Group 2 (G2)] also in an awake, eyes open, condition. The awake, eyes closed, maps showed marked differences in the power spectral density (PSD) of the different bands, when comparing normal subjects with patients with several degrees of hepatic encephalopathy. These differences were related to the degree of clinical involvement, mainly in the alpha and delta PSD bands. The combination of a decreased alpha PSD, increased delta PSD, and decreased mean dominant frequency (MDF) allowed a clear discrimination between the different clinical groups. The differences observed between awake, eyes closed, and awake, eyes open, conditions were especially helpful to discriminate between CG subjects and G0, G1 and G2 patients.
Keywords:brain mapping  hepatic encephalopathy  power spectral density  PSD  mean dominant frequency  MDF
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