Recently up-coming drug, etomidate which is a modulator of GABA(gamma-Aminobutyric acid)-A
receptor has been known that it maintains the appropriate sedative levels and affects little
effects on respiratory system.
The investigators are now trying to investigate that etomidate with meperidine combination
regimen is superior to the midazolam with meperidine more effective and less harm on sedation
during the ERCP procedure.