Clonidine premedication effects on inhaled induction with sevoflurane in adults: a prospective, double-blind, randomized study.
BACKGROUND
The purpose of this study was to evaluate whether oral clonidine premedication becomes an alternative to N2O in terms of shortening the induction time and attenuation of the adrenergic response to tracheal intubation during inhalation induction with sevoflurane, and to evaluate the quality of anesthetic induction according to the patient's satisfaction.


METHODS
We studied 84 female patients who were randomly allocated into four study groups: Groups I and II received a placebo orally, and Groups III and IV received clonidine at 150 and 300 microg, respectively, 90 min before induction of anaesthesia. Patients were anesthetized using a triple-deep-breath technique with 5% sevoflurane in Groups I, III and IV, and with 60% N2O-5% sevoflurane in group II.


RESULTS
Induction time was significantly longer (P < 0.05) in Group I. Increases in mean blood pressure and heart rate after tracheal intubation were significantly suppressed in Groups III and IV but not in Group II compared with Group I. Comfort and impression of anesthesia was better in Groups III and IV than in Groups I and II.


CONCLUSIONS
In volatile anesthetic induction, pre-anesthetic clonidine may become an alternative to N2O and may provide more comfort than with N2O.
Watanabe
T
T
Department of Anesthesiology and Critical Care Medicine, Tottori University Faculty of Medicine, Yonago, Tottori, Japan.
Inagaki
Y
Y
Ishibe
Y
Y
D000328:Adult; D000700:Analgesics / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D000769:Anesthesia, Inhalation / Q000379:methods*; D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D003000:Clonidine / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004357:Drug Synergism; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D007442:Intubation, Intratracheal / Q000379:methods; D008738:Methyl Ethers / Q000494:pharmacology*; D008875:Middle Aged; D017060:Patient Satisfaction; D011229:Preanesthetic Medication / Q000009:adverse effects / Q000379:methods*; D011446:Prospective Studies; D000077149:Sevoflurane; D013997:Time Factors
D000700:Analgesics; D018685:Anesthetics, Inhalation; D008738:Methyl Ethers; D000077149:Sevoflurane; D003000:Clonidine