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First Results of the Swiss National Surgical Site Infection Surveillance Program: Who Seeks Shall Find

Published online by Cambridge University Press:  31 May 2017

Nicolas Troillet*
Affiliation:
Swissnoso-National Center for Infection Control, Bern, Switzerland Service of Infectious Diseases, Central Institute, Valais Hospital, Sion, Switzerland Services of Preventive Medicine and Infectious Diseases, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Switzerland
Emin Aghayev
Affiliation:
Swiss RDL-Medical Registries and Data Linkage, Institute for Social and Preventive Medicine, University of Bern, Switzerland
Marie-Christine Eisenring
Affiliation:
Swissnoso-National Center for Infection Control, Bern, Switzerland Service of Infectious Diseases, Central Institute, Valais Hospital, Sion, Switzerland
Andreas F. Widmer
Affiliation:
Swissnoso-National Center for Infection Control, Bern, Switzerland Division of Infectious Diseases and Hospital Epidemiology, University Hospital of Basel, Switzerland
*
Address correspondence to Nicolas Troillet, Central Institute, Valais Hospital, Ave. Grand-Champsec 86, Sion, CH 1950, Switzerland (nicolas.troillet@hopitalvs.ch).

Abstract

OBJECTIVES

To report on the results of the Swiss national surgical site infection (SSI) surveillance program, including temporal trends, and to describe methodological characteristics that may influence SSI rates

DESIGN

Countrywide survey of SSI over a 4-year period. Analysis of prospectively collected data including patient and procedure characteristics as well as aggregated SSI rates stratified by risk categories, type of SSI, and time of diagnosis. Temporal trends were analyzed using stepwise multivariate logistic regression models with adjustment of the effect of the duration of participation in the surveillance program for confounding factors.

SETTING

The study included 164 Swiss public and private hospitals with surgical activities.

RESULTS

From October 2011 to September 2015, a total of 187,501 operations performed in this setting were included. Cumulative SSI rates varied from 0.9% for knee arthroplasty to 14.4% for colon surgery. Postdischarge follow-up was completed in >90% of patients at 1 month for surgeries without an implant and in >80% of patients at 12 months for surgeries with an implant. High rates of SSIs were detected postdischarge, from 20.7% in colon surgeries to 93.3% in knee arthroplasties. Overall, the impact of the duration of surveillance was significantly and independently associated with a decrease in SSI rates in herniorraphies and C-sections but not for the other procedures. Nevertheless, some hospitals observed significant decreases in their rates for various procedures.

CONCLUSIONS

Intensive post-discharge surveillance may explain high SSI rates and cause artificial differences between programs. Surveillance per se, without structured and mandatory quality improvement efforts, may not produce the expected decrease in SSI rates.

Infect Control Hosp Epidemiol 2017;38:697–704

Type
Original Articles
Copyright
© 2017 by The Society for Healthcare Epidemiology of America. All rights reserved 

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