Experienced endoscopists performed EGD or colonoscopy. Before EGD, local anesthesia of the pharynx was induced using a viscous solution of 2% lidocaine hydrochloride (Xylocaine® Viscous 2%; AstraZeneca Inc., OSAKA, Japan) [17 (link)]. For endoscopic sedation, midazolam and/or pethidine were used according to the patient’s response [18 (link)]. The doses of midazolam and/or pethidine were determined by each endoscopist. CO2 was used as insufflation agent for all patients, except those with chronic respiratory failure [19 (link)]. Flumazenil and/or naloxone were used as antagonists of midazolam and/or pethidine for sedation recovery.
The patients were transferred to the recovery room after the procedure. When Aldrete’s scoring system was 9 out of 10, or more, they were discharged from the recovery room [20 (link)]. Their check out time was recorded after they had finished changing their clothes.