The Integrated Inpatient Management Model was a 2.5-year controlled prospective trial of using a clinical information system to direct and monitor physician and hospital practice on general medicine services of an 880-bed university hospital. For the over 2,000 admissions on both a control service and the intervention service, the mean length of stay (LOS) decreased when compared with historic norms (0.68 and 0.95 days respectively; P < 0.01 for both). This difference in mean LOS represents a savings of 580 hospital days for the intervention over the control service; (95% confidence interval, 300 to 1420 days). There also was a trend for the intervention service to have fewer LOS outliers than expected (P = 0.14). Ancillary service use decreased by 17% on both control and intervention services (a trend that disappeared after the study was terminated), while other internal medicine services experienced a 29% increase in this measure of resource use. The intervention service experienced fewer preventable deaths (P = 0.04), but there were no differences in global quality of care measures, readmission and mortality rates, and patient satisfaction. This use of a clinical information system is a prototype for the systems that will be needed for all forms of managed care.

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