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This article is part of the supplement: International Conference on Prevention & Infection Control (ICPIC 2011)

Open Access Poster presentation

Evalutaion of two different control charts (I and U) in the study of mutiresistant bacteria contact precautions dynamics in a non-endemicity hospital setting

G Mestre1*, C Berbel1, P Tortajada1, JR Agüera2, L Cort2, J Zaragoza2, JA Martinez3 and J Rodriguez-Baño4

  • * Corresponding author: G Mestre

Author Affiliations

1 Nosocomial Infection Control Unit, Barcelona, Spain

2 Microbiologic Unit, Delfos Medical Centre, Barcelona, Spain

3 Infectious diseases Unit, Hospital Clinic, Barcelona, Spain

4 Infectious diseases and Microbiology Unit, University Hospital Virgen de Macarena, Sevilla, Spain

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BMC Proceedings 2011, 5(Suppl 6):P11  doi:10.1186/1753-6561-5-S6-P11

The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1753-6561/5/S6/P11


Published:29 June 2011

© 2011 Mestre et al; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction / objectives

Data about usefulness of Statistical Process Control in the study of contact precautions (CP) dynamics for control of resistant bacteria are scarce.

Methods

Retrospective cohort study. All admitted patients colonized or infected by MRSA, MDR-PAE and Abaumannii from 2005 to 2010 were included. Period I (01/2005-04/2008) without active surveillance; Period II (05/2008-12/2010), active surveillance in all patients admitted to the Intensive Care Unit and in readmitted previously colonized patients. Clonality was studied by PFGE. Charts: I-graph (Y axis shows the days between two consecutive CP;X axis: consecutive number of CP) and U-graph (CP per 10.000 patients days clustered by quarters).

Results

The average days between two consecutive CP in period I and period II were: 20 vs 31 days for MRSA, 41 vs 46 days for MDR-PAE and 53 vs 59 days for Ab, respectively. The average rate of patients under CP per 10.000 patient-days were: 3.19 vs 2.51 for MRSA, 1.40 vs 1.49 for PAE MR and 1.35 vs 1.09 for Ab (period I and II respectively). All outbreaks were coincident for special negative causes in graph I while the U graph only detected 2 out of 5 (type II error). All special positive causes was detected by graph I just after outbreak intervention (more days between consecutive CP). Although graph I often showed positive special causes in 5 out of 12, a type I error could not be ruled out.

Conclusion

In a non endemic setting when few events are present, the I graph is more sensitive and less specific, while the U graph is more specific but less sensitive.

Disclosure of interest

None declared.