[EEG pattern during total intravenous anesthesia with droperidol, fentanyl and ketamine]

We evaluated EEG pattern during total intravenous anesthesia with droperidol, fentanyl and ketamine (DFK). Four surgical patients, ranged in age from 35 to 43, were the subjects of this study. Two male underwent oral or orthopedic surgery and the other two female patients underwent gynecological surgery. They were all free from hepato-renal dysfunction and central nervous system disorders. For the induction of anesthesia, droperidol 0.06-0.1 ml.kg-1, fentanyl 2-4 micrograms.kg-1, and ketamine 1.0-1.5 mg.kg-1 were slowly administered intravenously. A total dose of 5-15 micrograms.kg-1 of fentanyl was given intravenously with continuous infusion of ketamine 2 mg.kg-1.h-1 during the surgical procedure. The total amounts of fentanyl and ketamine administered were 4.9-22.2 micrograms.kg-1 and 240-340 mg.kg-1, respectively. We used HZI'Brain Function Monitoring system to evaluate their EEG patterns. When adequate depth of anesthesia was obtained as clinically evaluated by vital signs, theta wave pattern was dominant on the EEG tracings in any of these patients. DFK anesthesia would provide a stable anesthetic course, if those drugs are administered adequately considering vital signs including systemic blood pressure, heart rate, lacrimation and involuntary muscle movements of the face and extremities.