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Frequent Hospital Readmissions for Clostridium difficile Infection and the Impact on Estimates of Hospital-Associated C. difficile Burden

Published online by Cambridge University Press:  02 January 2015

Courtney R. Murphy ,
Taliser R. Avery ,
Erik R. Dubberke  and
Susan S. Huang
Courtney R. Murphy*
Affiliation:
Division of Infectious Diseases and Health Policy Research Institute, University of California Irvine School of Medicine, Irvine, California
Taliser R. Avery
Affiliation:
Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts
Erik R. Dubberke
Affiliation:
Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
Susan S. Huang
Affiliation:
Division of Infectious Diseases and Health Policy Research Institute, University of California Irvine School of Medicine, Irvine, California
*
Health Policy Research Institute, 100 Theory Drive, Suite 110, Irvine, CA 92617 ([email protected])
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Abstract

Objective.

Clostridium difficile infection (CDI) is associated with hospitalization and may cause readmission following admission for any reason. We aimed to measure the incidence of readmissions due to CDI.

Design.

Retrospective cohort study.

Patients.

Adult inpatients in Orange County, California, who presented with new-onset CDI within 12 weeks of discharge.

Methods.

We assessed mandatory 2000–2007 hospital discharge data for trends in hospital-associated CDI (HA-CDI) incidence, with and without inclusion of postdischarge CDI (PD-CDI) events resulting in rehospitalization within 12 weeks of discharge. We measured the effect of including PD-CDI events on hospital-specific CDI incidence, a mandatory reporting measure in California, and on relative hospital ranks by CDI incidence.

Results.

From 2000 to 2007, countywide hospital-onset CDI (HO-CDI) incidence increased from 15 per 10,000 to 22 per 10,000 admissions. When including PD-CDI events, HA-CDI incidence doubled (29 per 10,000 in 2000 and 52 per 10,000 in 2007). Overall, including PD-CDI events resulted in significantly higher hospital-specific CDI incidence, although hospitals had disproportionate amounts of HA-CDI occurring postdischarge. This resulted in substantial shifts in some hospitals' rankings by CDI incidence. In multivariate models, both HO and PD-CDI were associated with increasing age, higher length of stay, and select comorbidities. Race and Hispanic ethnicity were predictive of PD-CDI but not HO-CDI.

Conclusions.

PD-CDI events associated with rehospitalization are increasingly common. The majority of HA-CDI cases may be occurring postdischarge, raising important questions about both accurate reporting and effective prevention strategies. Some risk factors for PD-CDI may be different than those for HO-CDI, allowing additional identification of high-risk groups before discharge.

Infect Control Hosp Epidemiol 2012;33(1):20-28

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 33 , Issue 1 , January 2012 , pp. 20 - 28
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2012

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