Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Litscher, G; Schwarz, G.
Is there paradoxical arousal reaction in the EEG subdelta range in patients during anesthesia?
J Neurosurg Anesthesiol. 1999; 11(1):49-52
Doi: 10.1097/00008506-199901000-00010
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- Führende Autor*innen der Med Uni Graz
- Litscher Gerhard
- Co-Autor*innen der Med Uni Graz
- Schwarz Gerhard
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- Abstract:
- Different anesthetic drugs can produce different electroencephalographic (EEG) patterns. Nondrug induced influences, such as surgical stimulation, may also alter the EEG in anesthetized patients. Increases of delta activity are interpreted as signs of deepening of anesthesia. These EEG patterns are sometimes also found in frontal leads after surgical stimulation during isoflurane anesthesia. However, to avoid incorrect anesthetic management under EEG monitoring, this phenomenon of "paradoxical arousal" must be taken into consideration. This study demonstrates that, after surgical stimulation, frontal activity was enhanced in the 2-3 Hz and 3-4 Hz frequency bands. On the other hand, in the subdelta range (the 0.05-1 Hz and 1-2 Hz frequency bands), there was an opposite reaction. This significant (p<0.001, according to ANOVA and Dunn's method) reduction of EEG power as a result of the surgical stimuli was found in 25 patients (mean age, 49.1+/-16.3 years) scheduled for elective neurosurgical intervention in the lumbosacral region. This report shows some of the problems arising from the common practice of arbitrarily subdividing a power spectrum in frequency bands.
- Find related publications in this database (using NLM MeSH Indexing)
- Adolescent -
- Adult -
- Aged -
- Analysis of Variance -
- Anesthesia, General -
- Anesthetics, Inhalation - administration and dosage
- Anesthetics, Intravenous - administration and dosage
- Arousal - drug effects
- Delta Rhythm - drug effects
- Electroencephalography - drug effects
- Female - drug effects
- Fentanyl - administration and dosage
- Humans - administration and dosage
- Isoflurane - administration and dosage
- Lumbosacral Region - administration and dosage
- Male - administration and dosage
- Middle Aged - administration and dosage
- Monitoring, Intraoperative - administration and dosage
- Nitrous Oxide - administration and dosage
- Spinal Cord - surgery
- Surgical Procedures, Elective - surgery
- Thiopental - administration and dosage
- Find related publications in this database (Keywords)
- Neuromonitoring
- EEG
- Paradoxical Arousal
- Anesthesia
- Subdelta Activity