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  • Infection Control & Hospital Epidemiology, Volume 32, Issue 5
  • May 2011, pp. 472-480

Deriving Measures of Intensive Care Unit Antimicrobial Use from Computerized Pharmacy Data: Methods, Validation, and Overcoming Barriers

  • David N. Schwartz (a1), R. Scott Evans (a2) (a3), Bernard C. Camins (a4), Yosef M. Khan (a5), James F. Lloyd (a2), Nadine Shehab (a6) and Kurt Stevenson (a5)
  • DOI: http://dx.doi.org/10.1086/659760
  • Published online: 01 January 2015
Abstract
Objective.

To outline methods for deriving and validating intensive care unit (ICU) antimicrobial utilization (AU) measures from computerized data and to describe programming problems that emerged.

Design.

Retrospective evaluation of computerized pharmacy and administrative data.

Setting.

ICUs from 4 academic medical centers over 36 months.

Interventions.

Investigators separately developed and validated programming code to report AU measures in selected ICUs. Use of antibacterial and antifungal drugs for systemic administration was categorized and expressed as antimicrobial-days (each day that each antimicrobial drug was given to each patient) and patient-days receiving antimicrobials (each day that any antimicrobial drug was given to each patient). Monthly rates were compiled and analyzed centrally, with ICU patient-days as the denominator. Results were validated against data collected from manual review of medical records. Frequent discussion among investigators aided identification and correction of programming problems.

Results.

AU data were successfully programmed though a reiterative process of computer code revision. After identifying and resolving major programming errors, comparison of computerized patient-level data with data collected by manual review of medical records revealed discrepancies in antimicrobial-days and patient-days receiving antimicrobials that ranged from less than 1% to 17.7%. The hospital from which numerator data were derived from electronic records of medication administration had the least discrepant results.

Conclusions.

Computerized AU measures can be derived feasibly, but threats to validity must be sought out and corrected. The magnitude of discrepancies between computerized AU data and a gold standard based on manual review of medical records varies, with electronic records of medication administration providing maximal accuracy.

Copyright
Corresponding author
Division of Infectious Diseases, John H. Stroger, Jr., Hospital of Cook County, 1901 West Harrison Street, Chicago, IL 60612 (david.schwartz@hektoen.org)
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Infection Control & Hospital Epidemiology
  • ISSN: 0899-823X
  • EISSN: 1559-6834
  • URL: /core/journals/infection-control-and-hospital-epidemiology
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