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Effect of Accounting for Multiple Concurrent Catheters on Central Line–Associated Bloodstream Infection Rates: Practical Data Supporting a Theoretical Concern

Published online by Cambridge University Press:  02 January 2015

Rebecca A. Aslakson ,
Mark Romig ,
Samuel M. Galvagno Jr ,
Elizabeth Colantuoni ,
Sara E. Cosgrove ,
Trish M. Perl  and
Peter J. Pronovost
Rebecca A. Aslakson*
Affiliation:
Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
Mark Romig
Affiliation:
Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
Samuel M. Galvagno Jr
Affiliation:
Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
Elizabeth Colantuoni
Affiliation:
Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland Department of Biostatistics, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
Sara E. Cosgrove
Affiliation:
Department of Hospital Epidemiology and Infection Control, The Johns Hopkins Hospital, Baltimore, Maryland
Trish M. Perl
Affiliation:
Department of Hospital Epidemiology and Infection Control, The Johns Hopkins Hospital, Baltimore, Maryland
*
The Johns Hopkins Hospital, 600 North Wolfe Street, Meyer 297A, Baltimore, MD, 21287-7294 ([email protected])
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Abstract

Background.

Central line-associated bloodstream infection (CLABSI) rates are gaining importance as they become publicly reported metrics and potential pay-for-performance indicators. However, the current conventional method by which they are calculated may be misleading and unfairly penalize high-acuity care settings, where patients often have multiple consurrent central venous catheters (CVCs).

Objective.

We compared the conventional method of calculating CLABSI rates, in which the number of catheter-days is used (1 patient with n catheters for 1 day has 1 catheter-day), with a new method that accounts for multiple concurrent catheters (1 patient with n catheters for 1 day has n catheter-days), to determine whether the difference appreciably changes the estimated CLABSI rate.

Design.

Cross-sectional survey.

Setting.

Academic, tertiary care hospital.

Patients.

Adult patients who were consecutively admitted from June 10 through July 9, 2009, to a cardiac-surgical intensive care unit and a surgical intensive and surgical intermediate care unit.

Results.

Using the conventional method, we counted 485 catheter-days throughout the study period, with a daily mean of 18.6 catheter-days (95% confidence interval, 17.2-20.0 catheter-days) in the 2 intensive care units. In contrast, the new method identified 745 catheter-days, with a daily mean of 27.5 catheter-days (95% confidence interval, 25.6-30.3) in the 2 intensive care units. The difference was statistically significant (P < .001). The new method that accounted for multiple concurrent CVCs resulted in a 53.6% increase in the number of catheter-days; this increased denominator decreases the calculated CLABSI rate by 36%.

Conclusions.

The undercounting of catheter-days for patients with multiple concurrent CVCs that occurs when the conventional method of calculating CLABSI rates is used inflates the CLABSI rate for care settings that have a high CVC burden and may not adjust for underlying medical illness. Additional research is needed to validate and generalize our findings.

Type
Original Article
Information
Infection Control & Hospital Epidemiology , Volume 32 , Issue 2 , February 2011 , pp. 121 - 124
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2011

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