| Measurement of
Minimal End-Tidal Concentration of Isoflurane
by Using Bispectral Index System
in Combined General-Epidural Anesthesia |
| 전신-경막외 병용 마취 시 Bispectal Index System을 이용한 Isoflurance의 최소 호기말 농도 측정 |
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신원호; 장영호; 강정길 |
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| Abstract |
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One of the benefits of
combined general-epidural anesthesia (CGEA)
is the capability reducing the inhalational agent concentration. We evaluated the
minimal end-tidal isoflurane concentration during CGEA by using Bispectral Index
System (BIS). Twenty patients undergoing total hip arthroplasty were randomly
selected. After general anesthesia with isoflurane and pure oxygen; 2.0%
mepivacaine was injected through epidural catheter. Subsequently; end-tidal
isoflurane concentration was reduced from 1.0 to 0.8; 0.6 and 0.5 vol% at 10
minutes intervals; and BIS scores were checked at each isoqlurane concentration.
The BIS score below 50 is considered to be an optimal level for sedation and
hypnosis. The result showed that the BIS scores of 1.0; 0.8; 0.6 and 0.5 vol% of
end-tidal isoflurane concentration were 43.9 ± 7.6; 44.8 ± 7.0; 45.8 ± 6.0 and
50.3 ± 6.7; respectively. Therefore we conclude that the minimal end-tidal
isoflurane concentration for CGEA with pure oxygen was 0.6 vol%. |
| Key Words:
Bispectral index,
Combined general-epidural anesthesia, Isoflurane |
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