Abstract:
:We studied the movement response to skin incision in 68 adult (males/females) ASA I-II patients receiving propofol +/- fentanyl intravenous anaesthesia using the bispectral index and 95% spectral edge frequency monitoring with an A-1050 EEG monitor. Following Ethics Committee approval, patients were randomly assigned to one of the following four treatments: Group P (n = 17): propofol infusion, 1 mg kg-1 min-1 intravenous for 2 min, followed by propofol infusion, 200 micrograms kg-1 min-1, until skin incision; Group PF1 (n = 17): fentanyl bolus, 1 microgram kg-1 intravenous + propofol infusion as in Group P; Group PF2 (n = 17): fentanyl bolus, 2 micrograms kg-1 intravenous + propofol infusion as in Group P; and Group PF3 (n = 17): fentanyl bolus, 3 micrograms kg-1 intravenous + propofol infusion as in Group P. The bispectral index and 95% spectral edge frequency were monitored continuously and recorded prior to induction of anaesthesia (base-line) and at skin incision. Twelve, 10, 4 and 4 patients responded to skin incision in Groups P, PF1, PF2 and PF3, respectively (P and PF1 vs. PF2 or PF3; P = 0.0001, and 0.006). The bispectral index and 95% spectral edge frequency were significantly lower at skin incision compared with the base-line values in all the four treatment groups. However, only bispectral index values were significantly lower in the nonmovement as compared with the movement (M) category (32.6 +/- 8.9 vs. 37.4 +/- 10.3; P = 0.04). Though deeper levels of hypnosis to lower bispectral index and 95% spectral edge frequency values may be effective in preventing the movement response to skin incision, provision of adequate analgesia rather than lower bispectral index and 95% spectral edge frequency (clinical maintenance) values may be more reliable for preventing the response to skin incision as bispectral index and 95% spectral edge frequency measure the hypnotic component of the anaesthetic effect. Lower bispectral index values may be more discriminatory as compared with 95% spectral edge frequency values for preventing the movement response to skin-incision.
journal_name
Eur J Anaesthesioljournal_title
European journal of anaesthesiologyauthors
Singh H,Sakai T,Matsuki Adoi
10.1046/j.1365-2346.1999.00549.xsubject
Has Abstractpub_date
1999-09-01 00:00:00pages
610-4issue
9eissn
0265-0215issn
1365-2346journal_volume
16pub_type
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