Clinical question: What is the incidence of antibiotic-associated adverse drug events (ADEs) among adult inpatients?
Background: Antibiotics are used widely in the inpatient setting, although 20%-30% of inpatient antibiotic prescription are estimated to be unnecessary. Data are lacking on the rates of associated ADEs.
Study design: Retrospective cohort study.
Setting: A single 1,194-bed academic tertiary medical center.
Synopsis: Of the 5,579 patients admitted to four inpatient medicine services between September 2013 and June 2014, 1,488 (27%) received antibiotics for at least 24 hours. Patients were followed through admission and out to 90 days. A total of 324 unique antibiotic-associated ADEs occurred among 298 (20%) patients within 90 days of initial therapy. The overall rate of antibiotic-associated ADEs was 22.9/10,000 person-days. The investigators determined that 287 (19%) of antibiotic regimens were not clinically indicated, and among those, there were 56 (20%) ADEs. The most common 30-day ADEs were gastrointestinal, renal, and hematologic. The highest proportion of ADEs occurred with beta-lactams, fluoroquinolones, intravenous vancomycin, and trimethoprim-sulfamethoxazole, perhaps reflecting how commonly these agents are prescribed. Nearly all ADEs were considered clinically significant (97%). There were no deaths attributable to antibiotic-associated ADEs.
Bottom line: Antibiotic associated ADEs occur in about one in five inpatients, and about one in five antibiotic prescriptions may not be clinically indicated.
Citation: Tamma PD et al. Association of adverse events with antibiotic use in hospitalized patients..
Dr. Anderson is an associate program director in the internal medicine residency training program at the University of Colorado School of Medicine and a hospitalist at the VA Eastern Colorado Health Care System in Denver.