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Original Investigation
November 2016

Estimating National Trends in Inpatient Antibiotic Use Among US Hospitals From 2006 to 2012

Author Affiliations
  • 1Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
JAMA Intern Med. 2016;176(11):1639-1648. doi:10.1001/jamainternmed.2016.5651
Key Points

Question  How much antibiotic use occurs in US hospitals, and has the pattern of use changed over time?

Findings  Overall rates of antibiotic use in US hospitals did not change significantly from 2006 to 2012; however, use of certain antibiotic classes, including glycopeptides, β-lactam/β-lactamase inhibitor combinations, and carbapenems, increased significantly.

Meaning  Patterns of antibiotic use in US hospitals may have important implications for reducing antibiotic-resistant infections; these findings can help inform national efforts to improve antibiotic use by suggesting key targets for improvement.

Abstract

Importance  The rising threat of antibiotic resistance and other adverse consequences resulting from the misuse of antibiotics requires a better understanding of antibiotic use in hospitals in the United States.

Objective  To use proprietary administrative data to estimate patterns of US inpatient antibiotic use in recent years.

Design, Setting, and Participants  For this retrospective analysis, adult and pediatric in-patient antibiotic use data was obtained from the Truven Health MarketScan Hospital Drug Database (HDD) from January 1, 2006, to December 31, 2012. Data from adult and pediatric patients admitted to 1 of approximately 300 participating acute care hospitals provided antibiotic use data for over 34 million discharges representing 166 million patient-days.

Main Outcomes and Measures  We retrospectively estimated the days of therapy (DOT) per 1000 patient-days and the proportion of hospital discharges in which a patient received at least 1 dose of an antibiotic during the hospital stay. We calculated measures of antibiotic usage stratified by antibiotic class, year, and other patient and facility characteristics. We used data submitted to the Centers for Medicare and Medicaid Services Healthcare Cost Report Information System to generate estimated weights to apply to the HDD data to create national estimates of antibiotic usage. A multivariate general estimating equation model to account for interhospital covariance was used to assess potential trends in antibiotic DOT over time.

Results  During the years 2006 to 2012, 300 to 383 hospitals per year contributed antibiotic data to the HDD. Across all years, 55.1% of patients received at least 1 dose of antibiotics during their hospital visit. The overall national DOT was 755 per 1000 patient-days. Overall antibiotic use did not change significantly over time. The multivariable trend analysis of data from participating hospitals did not show a statistically significant change in overall use (total DOT increase, 5.6; 95% CI, −18.9 to 30.1; P = .65). However, the mean change (95% CI) for the following antibiotic classes increased significantly: third- and fourth-generation cephalosporins, 10.3 (3.1-17.5); macrolides, 4.8 (2.0-7.6); glycopeptides, 22.4 (17.5-27.3); β-lactam/β-lactamase inhibitor combinations, 18.0 (13.3-22.6); carbapenems, 7.4 (4.6-10.2); and tetracyclines, 3.3 (2.0-4.7).

Conclusions and Relevance  Overall DOT of all antibiotics among hospitalized patients in US hospitals has not changed significantly in recent years. Use of some antibiotics, especially broad spectrum agents, however, has increased significantly. This trend is worrisome in light of the rising challenge of antibiotic resistance. Our findings can help inform national efforts to improve antibiotic use by suggesting key targets for improvement interventions.

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