99 Aims: Several national organizations have been involved in the development of guidelines for pediatric sedation Numerous references recommend dosage ranges for medications used for pediatric sedation. Are these doses appropriate for children undergoing gastrointestinal endoscopy? The aims of this study were to determine: 1) Are recommended guidelines for pediatric sedation adequate for endoscopy procedures? 2) What were the dosage ranges used by pediatric gastroenterologists? 3) If dosage ranges were exceeded, were any complications identified? Methods: Dosages of sedatives administered by 6 pediatric gastroenterologists in 41 procedures were retrospectively reviewed. Ages of children ranged from 1 month to 18 years. Individual physicians titrated the doses of medications to achieve adequate sedation. Medications used by all physicians included meperidine, midazolam, and diazepam. Diphenhydramine, promethazine, chlorpromazine and chloral hydrate were also used by some physicians. The total dosage for each medication administered was compared to our institutional guidelines (based on ranges found in standard references). All patients were monitored according to AAP recommendations, including continuous pulse oximetry, documentation of vital signs and continuous assessment by a nurse whose sole responsibility was to monitor the patient. Each case was reviewed for adverse events, which were defined as patient responses which necessitated intervention (i.e. supplemental O2 administration, tactile stimulation, transfer to the intensive care unit, overnight hospitalization). Results: 22/38(58%) of meperidine doses, 16/35 (46%) of midazolam doses, and 4/9 (45%) of diazepam doses exceeded the recommended mg/kg doses. Statistical analysis demonstrated (in mg/kg): Meperidine range 0.2-6.5, mean ± S.D.=2.58±1.3. Midazolam range 0.07-0.6, mean ± S.D.=0.19±0.11. Diazepam range 0.06-0.36, mean ± S.D.=0.2±0.1. Meperidine was always administered with at least one of the benzodiazepine medications. Doses were titrated over 1 to 72 min (average 18min). There was one adverse event, in which the patient's oxygen saturation decreased to 88% and the child was difficult to arouse. This event occurred 15 minutes after the completion of the procedure and resolved spontaneously. No endoscopy was aborted due to complications from sedation or the procedure itself. Conclusions: 1) Sedation required for pediatric gastrointestinal endoscopy procedures frequently exceeds recommended guidelines, suggesting that these guidelines may need to be modified. 2) Adverse events were rarely noted when recommended guidelines were exceeded. 3) Patient monitoring is essential and must be continued until the patient reaches baseline assessment.