Study of the implementation of clinical decision support on the rates of CT scanning for pediatric patients presenting with abdominal pain (and possible appendicitis) to 2 large, tertiary emergency departments. Decision support in this case consisted of an order set, a web-based risk stratification tool, and an alert presented at the time of CT ordering to guide practitioners in the use of the latter tools. Results showed about a 50% decrease in the rate of CT scan ordering, with no increase in missed appendicitis or other complications. In the studied population, 28% of patients had appendicitis.
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