Sedation using anxiolytic, hypnotic and /or analgesic drugs is currently used during flexible bronchoscopy (FB) to facilitate the diagnostic process and improve patient comfort.[The technique of sedation varies widely and depends primarily on the experience of the chest physician. FB can also be done without sedation. However, according to a recent survey, 80% of patients prefer to be sedated during FB and it is also well known that the operator has a tendency to overstate the tolerance of patients during the procedure.