Korean J Anesthesiol.  2012 Jan;62(1):13-18. 10.4097/kjae.2012.62.1.13.

Bispectral index and their relation with consciousness of the patients who receive desflurane or sevoflurane anesthesia during wake-up test for spinal surgery for correction

• Seol TK
• Han MK
• Lee HJ
• Cheong MA
• Jun JH

• KMID: 2236445
• DOI: http://doi.org/10.4097/kjae.2012.62.1.13

Abstract

BACKGROUND
Wake-up tests may be necessary during surgery for kypho-scoliosis to ensure that spinal function remains intact. It is difficult to predict the time when patients can respond to a verbal command. We evaluated the effectiveness of the bispectral index (BIS) and its relation to patients' levels of consciousness in wake-up tests during desflurane and sevoflurane anesthesia.
METHODS
Eighteen patients each were enrolled in the desflurane and sevoflurane groups for spinal correction surgery. We measured BIS values, blood pressure, heart rate, and consciousness state and time, at the points when patients responded during the wake-up test.
RESULTS
The BIS values when patients made fists upon a verbal command (T3) were 86.7 +/- 7.5 for desflurane and 90.3 +/- 5.4 for sevoflurane. Patients in the desflurane group had significantly shorter wake up delays than those in the sevoflurane group (6.9 +/- 1.8 min vs. 11.8 +/- 3.6 min). However, there was no difference between the groups in the time between the response to a verbal command and the time when a patient moved their toes in response to verbal commands. No recall of the wake-up tests occurred in either group.
CONCLUSIONS
The values obtained using the BIS index could to some extent predict the time of a patient's and would be informative during desflurane and sevoflurane anesthesia. Moreover, desflurane permitted faster responses to verbal commands than sevoflurane, and allowed the wake-up test to be performed sooner.

Keyword

Bispectral index; Spinal surgery; Wake-up test

MeSH Terms

Anesthesia
Blood Pressure
Consciousness
Dietary Sucrose
Heart Rate
Humans
Isoflurane
Methyl Ethers
Toes
Dietary Sucrose
Isoflurane
Methyl Ethers