Identification of sensory blockade by somatosensory and pain-induced evoked potentials
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Identification of sensory blockade by somatosensory and pain-induced evoked potentials. / Schmidt, Gunter Niels; Scharein, Eckehard; Siegel, Markus; Müller, Jakob; Debener, Stefan; Nitzschke, Rainer; Engel, Andreas K.; Bischoff, Petra.
In: ANESTHESIOLOGY, Vol. 106, No. 4, 4, 04.2007, p. 707-714.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Identification of sensory blockade by somatosensory and pain-induced evoked potentials
AU - Schmidt, Gunter Niels
AU - Scharein, Eckehard
AU - Siegel, Markus
AU - Müller, Jakob
AU - Debener, Stefan
AU - Nitzschke, Rainer
AU - Engel, Andreas K.
AU - Bischoff, Petra
PY - 2007/4
Y1 - 2007/4
N2 - BACKGROUND: To date, the anesthesia-induced blockade of nociceptive inputs is insufficiently reflected by commercially available electroencephalographic depth-of-anesthesia monitors. The aim of the current study was to evaluate the potential of somatosensory (SSEP) and intracutaneous pain evoked (iSEP) potentials during remifentanil and propofol anesthesia as electroencephalographic indicators of the nociceptive blockade.METHODS: Ten healthy men were investigated in a double-blind crossover design during three sessions with remifentanil, propofol, and placebo administration. All dosages were increased in a step-by-step mode. SSEP and iSEP recordings were performed followed by subjective pain ratings and measurement of level of sedation (modified Observer's Assessment of Alertness and Sedation Scale). Changes from baseline in evoked potential components, pain ratings, and sedation scale were assessed by Bonferroni-Holms-corrected Wilcoxon tests.RESULTS: Pain ratings were significantly reduced by remifentanil. Sedation scale was significantly reduced by propofol. Early SSEP components were not affected by medication. The amplitudes of the long latency SSEP components increased significantly with remifentanil, decreased with propofol, and did not change with placebo. The amplitudes of long latency components of the iSEP decreased significantly with both remifentanil and propofol and did not change with placebo.CONCLUSION: Long latency components of the SSEP are differently affected by remifentanil and propofol administration. Further studies are needed to clarify whether they can serve as a specific indicator of the nociceptive blockade during anesthesia.
AB - BACKGROUND: To date, the anesthesia-induced blockade of nociceptive inputs is insufficiently reflected by commercially available electroencephalographic depth-of-anesthesia monitors. The aim of the current study was to evaluate the potential of somatosensory (SSEP) and intracutaneous pain evoked (iSEP) potentials during remifentanil and propofol anesthesia as electroencephalographic indicators of the nociceptive blockade.METHODS: Ten healthy men were investigated in a double-blind crossover design during three sessions with remifentanil, propofol, and placebo administration. All dosages were increased in a step-by-step mode. SSEP and iSEP recordings were performed followed by subjective pain ratings and measurement of level of sedation (modified Observer's Assessment of Alertness and Sedation Scale). Changes from baseline in evoked potential components, pain ratings, and sedation scale were assessed by Bonferroni-Holms-corrected Wilcoxon tests.RESULTS: Pain ratings were significantly reduced by remifentanil. Sedation scale was significantly reduced by propofol. Early SSEP components were not affected by medication. The amplitudes of the long latency SSEP components increased significantly with remifentanil, decreased with propofol, and did not change with placebo. The amplitudes of long latency components of the iSEP decreased significantly with both remifentanil and propofol and did not change with placebo.CONCLUSION: Long latency components of the SSEP are differently affected by remifentanil and propofol administration. Further studies are needed to clarify whether they can serve as a specific indicator of the nociceptive blockade during anesthesia.
KW - Adult
KW - Analgesics, Opioid/pharmacology
KW - Double-Blind Method
KW - Electroencephalography/drug effects
KW - Evoked Potentials/drug effects
KW - Evoked Potentials, Somatosensory/drug effects
KW - Humans
KW - Hypnotics and Sedatives/pharmacology
KW - Male
KW - Pain/physiopathology
KW - Piperidines/pharmacology
KW - Propofol/pharmacology
KW - Remifentanil
U2 - 10.1097/01.anes.0000264774.09910.c6
DO - 10.1097/01.anes.0000264774.09910.c6
M3 - SCORING: Journal article
C2 - 17413908
VL - 106
SP - 707
EP - 714
JO - ANESTHESIOLOGY
JF - ANESTHESIOLOGY
SN - 0003-3022
IS - 4
M1 - 4
ER -