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Journal of the American Medical Informatics Association 6:512-522 (1999)
© 1999 American Medical Informatics Association


Research Paper

Improving Response to Critical Laboratory Results with Automation

Results of a Randomized Controlled Trial

Gilad J. Kuperman, MD, PhD1, Jonathan M. Teich, MD, PhD1, Milenko J. Tanasijevic, MD2, Nell Ma'Luf2, Eve Rittenberg, MA2, Ashish Jha, MD2, Julie Fiskio1, James Winkelman, MD1,2 and David W. Bates, MD, MSc

1 Partners HealthCare System.
2 Harvard Medical School, Boston, Massachusetts.

Gilad J. Kuperman, MD, PhD, Partners HealthCare System, Department of Information Systems, 850 Boylston Street, Suite 202, Chestnut Hill, MA 02467. e-mail: <gkuperman{at}partners.org >.

Objective: To evaluate the effect of an automatic alerting system on the time until treatment is ordered for patients with critical laboratory results.

Design: Prospective randomized controlled trial.

Intervention: A computer system to detect critical conditions and automatically notify the responsible physician via the hospital's paging system.

Patients: Medical and surgical inpatients at a large academic medical center. One two-month study period for each service.

Main outcomes: Interval from when a critical result was available for review until an appropriate treatment was ordered. Secondary outcomes were the time until the critical condition resolved and the frequency of adverse events.

Methods: The alerting system looked for 12 conditions involving laboratory results and medications. For intervention patients, the covering physician was automatically notified about the presence of the results. For control patients, no automatic notification was made. Chart review was performed to determine the outcomes.

Results: After exclusions, 192 alerting situations (94 interventions, 98 controls) were analyzed. The intervention group had a 38 percent shorter median time interval (1.0 hours vs. 1.6 hours, P = 0.003; mean, 4.1 vs. 4.6 hours, P = 0.003) until an appropriate treatment was ordered. The time until the alerting condition resolved was less in the intervention group (median, 8.4 hours vs. 8.9 hours, P = 0.11; mean, 14.4 hours vs. 20.2 hours, P = 0.11), although these results did not achieve statistical significance. The impact of the intervention was more pronounced for alerts that did not meet the laboratory's critical reporting criteria. There was no significant difference between the two groups in the number of adverse events.

Conclusion: An automatic alerting system reduced the time until an appropriate treatment was ordered for patients who had critical laboratory results. Information technologies that facilitate the transmission of important patient data can potentially improve the quality of care.




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