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Methods Inf Med 1994; 33(01): 35-38
DOI: 10.1055/s-0038-1634968
Original Article
Schattauer GmbH

DC-level Detection of Burst-Suppression EEG

T. Lipping
1   Signal Processing Laboratory Tampere Technical University, Finland
,
P. Loula
1   Signal Processing Laboratory Tampere Technical University, Finland
,
V. Jäntti
1   Signal Processing Laboratory Tampere Technical University, Finland
,
A Yli-Hankala
1   Signal Processing Laboratory Tampere Technical University, Finland
› Author Affiliations
Further Information

Publication History

Publication Date:
08 February 2018 (online)

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Abstract:

The EEG signal is usually recorded with low time constant analog prefilters to avoid low frequency artefacts. During this kind of recording the frequency components below the cutoff frequency of the analog prefilter (usually below about 1 to 3 Hz) are lost. By visual examination of some experimental recordings taken with a higher time constant, it was noticed that during burst-suppression EEG the DC-level of the signal rises sharply when the burst begins and falls when the burst ends. Thus, a burst actually consists of a mixed frequency discharge on a pulse-like DC-shift. We developed a filter algorithm to estimate the change in the DC-level during bursts as accurately as possible.

Keywords

Detection - EEG - FMH Filtering - Burst-Suppression - Anesthesia
 

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