The purpose of this study is to find difference in Minimum Alveolar Concentration(MAC) for maintaining Bispectral Index (BIS) below 50 between chronic opioid users and opioid naive patients.
1. Patients selection in elective surgery which need general anesthesia. 2. MAC BIS50 data was collected in each patients (by blinded investigator) 3. The data collection will be continued for enough sample size for using Dixon Up Down Method Analysis 4. After Data collection, MAC BIS below 50 will be analyzed in both groups ( Chronic opioid users versus opioid naive patients)
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
20
Department of Anesthesiology and Pain Medicine, National Cancer Center
Goyang-si, Gyeonggi-do 10408, South Korea
RECRUITINGMinimum Alveolar Concentration below BIS 50 in Sevoflurane; percentage (eg: 1.2%)
Dixon's up down method is applied in this study. So pre-set concentration of sevoflurane will be used in each group.
Time frame: 15 minutes after pre-set of the concentration of sevoflurane
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