The decision model was con-structed using the Bayesian network (BN) technique and was designed and validated for patients of surg ical ICUs (SICUs) at two tertiary teaching hospitals with complete EHR systems. The model was implemented as a CDS intervention and evaluated in November 2009 at two inpatient SICUs at Seoul National University Hospital (SNUH). This article reports on the impact of the CDS intervention on the prevalence of HAPU, ICU length of stay, and user adoption and attitudes toward the CDS.