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Infraslow EEG activity in burst periods from post asphyctic full term neonates

M. Thordstein ; Nils Löfgren (Institutionen för signaler och system) ; Anders Flisberg ; Ralph Bågenholm ; K. Lindecrantz ; Ingemar Kjellmer
Clin Neurophysiol (1388-2457 (Print)). Vol. 116 (2005), 7, p. 1501-6.
[Artikel, refereegranskad vetenskaplig]

OBJECTIVE: To investigate whether very low EEG frequency activity can be recorded from post asphyctic full term neonates using EEG equipment where the high pass filter level was lowered to 0.05 Hz. METHODS: The time constant of the amplifier hardware was set to 3.2 s in order to enable recordings that equal to a high pass filter cut off at 0.05 Hz. Burst episodes were selected from the EEGs of 5 post asphyctic full term neonates. The episodes were analysed visually using different montages and subjected to power spectrum analysis. Powers in two bands were estimated; 0-1 and 1-4 Hz, designated very low- and low-frequency activity, respectively (VLFA, LFA). RESULTS: In all infants, VLFA coinciding with the burst episodes could be detected. The duration of the VLFA was about the same as that of the burst episode i.e. around 4s. The activity was most prominent over the posterior regions. In this small material, a large amount of VLFA neonatally seemed to possibly be related to a more favourable prognosis. CONCLUSIONS: VLFA can be recorded from post asphyctic full term neonates using EEG equipment with lowered cut off frequency for the high pass filter. SIGNIFICANCE: VLFA normally disregarded due to filtering, is present in the EEG of sick neonates and may carry important clinical information.

Nyckelord: *Action Potentials, Artifacts, Asphyxia Neonatorum/*complications, Cerebral Cortex/*physiopathology, Cerebral Palsy/diagnosis/etiology/physiopathology, Diagnostic Errors, Electroencephalography/*methods, Female, Humans, Hypoxia, Brain/*diagnosis/etiology/*physiopathology, Infant, Newborn, Male, Signal Processing, Computer-Assisted

Denna post skapades 2007-10-11. Senast ändrad 2010-01-26.
CPL Pubid: 52757


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Institutioner (Chalmers)

Institutionen för signaler och system (1900-2017)
Institutionen för kvinnors och barns hälsa, Avdelningen för pediatrik (1991-2005)



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