Abstract
The applicability and performance of spectral entropy as a measure of
the depth of sedation was studied by comparison to the Richmond sedation and
agitation scale (RASS). A biopotential signal was meas-ured from the forehead
of eight ICU patients. From this biopotential four different frequency bands
were defined using trend fitting to the low and high frequency limits of the
pooled power spectra, two fre-quency bands representing EEG and the other two
representing fEMG. The spectral entropy from the EEG bands correlated very
well with the sedation levels of RASS. From levels 0 to –5 the decrease was
almost linear (r=0.51 and r=0.53). A similar comparison for the spectral
entropy of the fEMG bands did not produce any clear correlation (r=0.07 for
both fEMG bands), however there was still some clear in-teraction at some
levels. It seems that the RASS is dependent upon both EEG and fEMG effects.
That is; RASS is related to both cortical and sub-cortical components of
sedation.
| Original language | English |
|---|---|
| Title of host publication | The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society |
| Publisher | IEEE Institute of Electrical and Electronic Engineers |
| ISBN (Print) | 0-7803-8439-3 |
| DOIs | |
| Publication status | Published - 2004 |
| MoE publication type | A4 Article in a conference publication |