OBJECTIVE: To observe the changes of auditory evoked potentials (AEP) index, mean arterial blood pressure (MAP) and heart rate (HR) undergoing desflurane anesthesia in the elderly and to evaluate the use of AEP index for monitoring the depth of desflurane anesthesia in the elderly. METHODS: Forty patients classified as ASA physical status I-III undergoing general anesthesia were divided into 2 groups with 20 patients in each group: Group elderly (> or =65 years) and Group youth (18-55 years). Anesthesia was induced with propofol and vecuronium. After the endotracheal intubation, the lungs were ventilated with desflurane in oxygen. End-tidal concentration of desflurane was maintained at 0.6 MAC, 1.0 MAC and 1.3 MAC for 20 min, respectively. The changes of MAP, HR and AEP index were recorded simultaneously. RESULTS: During the anesthesia of desflurane, MAP decreased significantly compared with those at preanesthesia in both groups. And HR decreased significantly compared with those at preanesthesia only in Group elderly (P < 0.05). The changes of MAP and HR had no statistical difference with increasing end-tidal desflurane concentration from 0.6 MAC to 1.3 MAC in both groups (P > 0.05). During the anesthesia of desflurane, AEP index decreased significantly compared with those at preanesthesia in both groups (P < 0.05). In the periods of increasing concentration of desflurane, AEP index decreased gradually. In Group elderly, AEP index decreased significantly 1.0 MAC and 1.3 MAC of desflurane compared with those of 0.6 MAC (P < 0.05). In Group youth, the changes of AEP index had no statistical difference with increasing end-tidal desflurane concentration from 0. 6 MAC to 1.3 MAC (P > 0.05). At the same concentration of desflurane, AEP index in the Group elderly were less than those in Group youth (P < 0.05). AEP index correlated with the end-tidal desflurane concentration significantly. The coefficient of product-moment correlation (r) were -0.983 and -0.980, respectively in Group elderly and Group youth (P < 0.05). CONCLUSION AEP index correlates well with the end-tidal desflurane concentration which is valuable for monitoring the depth of desflurane anesthesia in the elderly. AEP index can show the different depth of anesthesia at the same end-tidal desflurane concentration between the elderly and youth.
Aged ; Anesthetics, Inhalation ; Desflurane ; Evoked Potentials, Auditory ; Female ; Humans ; Isoflurane ; analogs & derivatives ; Male ; Monitoring, Intraoperative ; methods

Anesthetics, Inhalation ; pharmacology ; Child ; Electrocardiography ; Heart Rate ; drug effects ; Humans ; Isoflurane ; analogs & derivatives ; pharmacology ; Methyl Ethers ; pharmacology

Adult ; Anesthetics, Inhalation ; administration & dosage ; Desflurane ; Electroencephalography ; methods ; Female ; Humans ; Isoflurane ; administration & dosage ; analogs & derivatives ; Male ; Middle Aged ; Monitoring, Intraoperative ; Nitrous Oxide ; administration & dosage

OBJECTIVE: To evaluate the values of bispectral index (BIS) in mornitoring the depth of desflurane anesthesia in the elderly by observing the changes of BIS at various end-tidal desflurane concentrations. METHODS: BIS was used to monitor the depth of desflurane anesthesia in the elderly without surgery stimulation. Forty ASA physical status I approximately III patients undergoing general anesthesia were divided into 2 groups with 20 in each group:Group Elderly ( > or =65 years) and Group Youth ( 18 approximately 55 years). Anesthesia was induced with propofol 2. 0 mg/kg and vecuronium 0. 1 mg/kg including the endotracheal topical anesthesia with 2% lidocaine. After the desflurane in oxygen, each concentration of desflurane was maintained for 20 minutes. The changes of mean arterial blood pressure (MAP), heart rate (HR) and BIS were recorded simultaneously. The timepoints setting for observation were: preanesthesia, 2 minutes after the anesthesia, endotracheal intubation, 2 minutes after the intubation, and end-tidal concentration of desflurane at 0. 6 MAC, 1.0 MAC and 1. 3 MAC. RESULTS: During anesthesia of desflurane, MAP and HR did not change significantly in the 2 groups with increasing end-tidal desflurane concentration from 0. 6 MAC to 1. 3 MAC (P > 0.05). BIS decreased significantly than that at preanesthesia in the 2 groups during anesthesia of desflurane ( P < 0.05 ). The changes of BIS were different in the 2 groups during the whole anesthesia (P < 0.05). As the concentration of desflurane increased, BIS decreased gradually but there were no significant changes on BIS in the 2 groups ( P > 0. 05 ). In general, BIS highly correlated with the end-tidal desflurane concentration. The coefficient of product-moment correlation (r) between BIS and the end-tidal desflurane concentration was -0. 996 and -0. 946 in Group Elderly and Youth (P < 0. 05 ). CONCLUSION BIS highly correlates with the end-tidal desflurane concentration which is used to evaluate the depth of desflurane anesthesia in the elderly and youth. There is different depth of anesthesia by BIS in the elderly or youth at the same end-tidal desflurane concentration.
Age Factors ; Aged ; Anesthetics, Inhalation ; Desflurane ; Dose-Response Relationship, Drug ; Electroencephalography ; drug effects ; methods ; Female ; Humans ; Isoflurane ; analogs & derivatives ; Male ; Monitoring, Intraoperative ; methods

PURPOSE: Although there is no clinical evidence of nephrotoxicity with the volatile anesthetics currently used in general anesthesia, a better agent should be needed in terms of preserving postoperative renal function in living kidney donors who have only single remaining kidney. The purpose of the current retrospective, single-center study was to evaluate and compare renal function of living kidney donors after nephrectomy under either sevoflurane or desflurane anesthesia. MATERIALS AND METHODS: From January 2006 through December 2011, a total of 228 donors undergoing video assisted minilaparotomy surgery nephrectomy for kidney donation were retrospectively enrolled in the current study. The donors were categorized into a sevoflurane group or desflurane group based on the type of volatile anesthetic used. We collected laboratory data from the patients preoperatively, immediately after the operation, on the first postoperative day and on the third postoperative day. We also compared renal function of the kidney donors after donor nephrectomy by comparing creatinine level and estimated glomerular filtration rate (eGFR). RESULTS: The decrease in renal function after surgery in both groups was the most prominent on the first postoperative day. There were no significant differences between the two groups in postoperative changes of creatinine or eGFR. CONCLUSION: Sevoflurane and desflurane can be used safely as volatile anesthetics in donors undergoing nephrectomy.
Adult ; Anesthesia, General/methods ; Anesthetics, Inhalation/adverse effects/*therapeutic use ; Female ; Humans ; Isoflurane/adverse effects/*analogs & derivatives/therapeutic use ; Kidney/*physiology ; Kidney Function Tests ; *Kidney Transplantation ; *Living Donors ; Male ; Methyl Ethers/adverse effects/*therapeutic use ; *Nephrectomy ; Postoperative Complications ; Retrospective Studies

PURPOSE: In earlier analyses, desflurane has been shown to reduce average extubation time and the variability of extubation time by 20% to 25% relative to sevoflurane in adult patients. We undertook this study to determine which agents prompt less recovery time in pediatric patients undergoing minor surgery. MATERIALS AND METHODS: After obtaining Institutional Review Board approval, we retrospectively reviewed the anesthesia records of 499 patients, with an average age of 5 years, who underwent minor surgeries at Severance Eye and Ear, Nose and Throat Hospital between May 2010 and April 2011. Anesthesia was induced with propofol and rocuronium. Anesthesia was maintained with sevoflurane (n=340) or desflurane (n=159) with 50% air/O2. Time from cessation of anesthetics to recovery of self-respiration, eye opening on verbal command and extubation were compared between the two groups. Additionally, the incidences of postoperative respiratory adverse events were also compared. RESULTS: Times to self-respiration recovery, eye opening on verbal command, and extubation were significantly faster in the desflurane group than the sevoflurane group (4.6+/-2.5 min vs. 6.9+/-3.8 min, 6.6+/-3.0 min vs. 9.2+/-3.6 min, and 6.2+/-2.7 min vs. 9.3+/-3.7 min, respectively, p<0.005). There were no statistically significant differences between the two groups with respect to adverse respiratory events during the peri-operative period (38.2% vs. 34.6%, p=0.468). CONCLUSION: Emergence and recovery from anesthesia were significantly faster in the desflurane group of children undergoing minor surgery. Desflurane did not result in any differences in respiratory adverse events during recovery compared to sevoflurane.
*Anesthesia Recovery Period ; Child ; Child, Preschool ; Female ; Humans ; Isoflurane/adverse effects/*analogs & derivatives/therapeutic use ; Male ; Methyl Ethers/adverse effects/*therapeutic use ; Perioperative Period ; Surgical Procedures, Minor ; Time Factors

BACKGROUNDThe mechanisms of action for volatile anesthetics remain unknown for centuries partly owing to the insufficient or ineffective research models. We designed this study to develop three strains derived from a wild-type Drosophila melanogaster with different sensitivities to volatile anesthetics, which may ultimately facilitate molecular and genetic studies of the mechanism involved.

METHODSMedian effective doses (ED(50)) of sevoflurane in seven-day-old virgin female and male wild-type Drosophila melanogaster were determined. The sensitive males and females of percentile 6 - 10 were cultured for breeding sensitive offspring (S(1)). So did median ones of percentile 48 - 52 for breeding median offspring (M(1)), resistant ones of percentile 91 - 95 for breeding resistant offspring (R(1)). Process was repeated through 31 generations, in the 37th generation, S(37), M(37) and R(37) were used to determine ED(50) for enflurane, isoflurane, sevoflurane, desflurane, halothane, methoxyflurane, chloroform and trichloroethylene, then ED(50) values were correlated with minimum alveolar concentration (MAC) values in human.

RESULTSFrom a wild-type Drosophila melanogaster we were able to breed three strains with high, median and low sevoflurane requirements. The ratio of sevoflurane requirements of three strains were 1.20:1.00:0.53 for females and 1.22:1.00:0.72 for males. Strains sensitive, median and resistant to sevoflurane were also sensitive, median and resistant to other volatile anesthetics. For eight anesthetics, ED(50) values in three strains correlated directly with MAC values in human.

CONCLUSIONSThree Drosophila melanogaster strains with high, median and low sensitivity to volatile anesthetics, but with same hereditary background were developed. The ED(50) are directly correlated with MAC in human for eight volatile anesthetics.

Anesthetics, Inhalation ; pharmacology ; Animals ; Chloroform ; pharmacology ; Drosophila melanogaster ; drug effects ; growth & development ; Enflurane ; pharmacology ; Female ; Halothane ; pharmacology ; Isoflurane ; analogs & derivatives ; pharmacology ; Male ; Methoxyflurane ; pharmacology ; Methyl Ethers ; pharmacology ; Trichloroethylene ; pharmacology

Several factors can affect the perioperative immune function. We evaluated the effect of propofol and desflurane anesthesia on the surgery-induced immune perturbation in patients undergoing breast cancer surgery. The patients were randomly assigned to receive propofol (n = 20) or desflurane (n = 20) anesthesia. The total and differential white blood cell counts were determined with lymphocyte subpopulations before and 1 hr after anesthesia induction and at 24 hr postoperatively. Plasma concentrations of interleukin (IL)-2 and IL-4 were also measured. Both propofol and desflurane anesthesia preserved the IL-2/IL-4 and CD4+/CD8+ T cell ratio. Leukocytes were lower in the propofol group than in the desflurane group at 1 hr after induction (median [quartiles], 4.98 [3.87-6.31] vs. 5.84 [5.18-7.94] 10(3)/microL) and 24 hr postoperatively (6.92 [5.54-6.86] vs. 7.62 [6.22-9.21] 10(3)/microL). NK cells significantly decreased 1 hr after induction in the propofol group (0.41 [0.34-0.53] to 0.25 [0.21-0.33] 10(3)/microL), but not in the desflurane group (0.33 [0.29-0.48] to 0.38 [0.30-0.56] 10(3)/microL). Our findings indicate that both propofol and desflurane anesthesia for breast cancer surgery induce a favorable immune response in terms of preservation of IL-2/IL-4 and CD4+/CD8+ T cell ratio in the perioperative period. With respect to leukocytes and NK cells, desflurane anesthesia is associated with less adverse immune responses than propofol anesthesia during surgery for breast cancer. (Clinical trial registration at https://cris.nih.go.kr/cris number: KCT0000939)
Adolescent ; Adult ; Aged ; Aged, 80 and over ; Anesthesia/adverse effects ; Anesthetics, Inhalation/*therapeutic use ; Anesthetics, Intravenous/*therapeutic use ; Breast Neoplasms/immunology/*surgery ; *CD4-CD8 Ratio ; Female ; Humans ; Interleukin-2/blood ; Interleukin-4/blood ; Isoflurane/*analogs & derivatives/therapeutic use ; Middle Aged ; Postoperative Period ; Propofol/*therapeutic use ; Young Adult

The aim of this study was to develop a nonlinear mixed-effects model for the increase in cerebral oximetry (rSO2) during the rapid introduction of desflurane, and to determine the effect of hypocapnia and N2O on the model. Twelve American Society of Anesthesiologist physical status class 1 and 2 subjects were allocated randomly into an Air and N2O group. After inducing anesthesia, desflurane was then increased abruptly from 4.0 to 12.0%. The PET(CO2), PET(DESF) and rSO2 were recorded at 12 predetermined periods for the following 10 min. The maximum increase in rSO2 reached +24-25% during normocapnia. The increase in rSO2 could be fitted to a four parameter logistic equation as a function of the logarithm of PET(DESF). Hypocapnia reduced the maximum response of rSO2, shifted the EC50 to the right, and increased the slope in the Air group. N2O shifted the EC50 to the right, and reduced the slope leaving the maximum rSO2 unchanged. The N2O-effects disappeared during hypocapnia. The cerebrovascular reactivity of rSO2 to CO2 is still preserved during the rapid introduction of desflurane. N2O slows the response of rSO2. Hypocapnia overwhelms all the effects of N2O.
Adult ; Anesthetics, Inhalation/*pharmacology ; *Cerebral Cortex/blood supply/drug effects/physiology ; Cerebrovascular Circulation/*drug effects/physiology ; Female ; Hemodynamics ; Humans ; Hypocapnia/*metabolism ; Isoflurane/*analogs & derivatives/pharmacology ; Male ; Middle Aged ; Models, Theoretical ; Nitrous Oxide/*metabolism ; *Oximetry ; Random Allocation ; Regional Blood Flow/drug effects

PURPOSE: This study aims to investigate the most appropriate effect-site concentration of remifentanil to minimize cardiovascular changes during inhalation of high concentration desflurane. MATERIALS AND METHODS: Sixty-nine American Society of Anesthesiologists physical status class I patients aged 20-65 years were randomly allocated into one of three groups. Anesthesia was induced with etomidate and rocuronium. Remifentanil was infused at effect-site concentrations of 2, 4 and 6 ng/mL in groups R2, R4 and R6, respectively. After target concentrations of remifentanil were reached, desflurane was inhaled to maintain the end-tidal concentration of 1.7 minimum alveolar concentrations for 5 minutes (over-pressure paradigm). The systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR) and end-tidal concentration of desflurane were measured for 5 minutes. RESULTS: The end-tidal concentration of desflurane increased similarly in all groups. The SBP, DBP, MAP and HR within group R4 were not significantly different as compared with baseline values. However, measured parameters within group R2 increased significantly 1-3 minutes after desflurane inhalation. The MAP within group R6 decreased significantly at 1, 2, 4, and 5 minutes (p<0.05). There were significant differences in SBP, DBP, MAP and HR among the three groups 1-3 minutes after inhalation (p<0.05). The incidence of side effects such as hyper- or hypo-tension, and tachy- or brady-cardia in group R4 was 4.8% compared with 21.8% in group R2 and 15.0% in group R6. CONCLUSION: The most appropriate effect-site concentration of remifentanil for blunting hemodynamic responses by inhalation of high concentration desflurane is 4 ng/mL.
Adult ; Aged ; Androstanols/adverse effects/pharmacology ; Anesthetics/adverse effects/pharmacology ; Anesthetics, Inhalation/adverse effects/*pharmacology ; Blood Pressure/drug effects ; Etomidate/adverse effects/pharmacology ; Female ; Heart/*drug effects ; Heart Rate/drug effects ; Humans ; Isoflurane/adverse effects/*analogs & derivatives/pharmacology ; Male ; Middle Aged ; Piperidines/adverse effects/*therapeutic use ; Protective Agents/adverse effects/*therapeutic use