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Suitability of the NNIS Index for Estimating Surgical-Site Infection Risk at a Small University Hospital in Brazil

  • Maria Léa Campos (a1), Zulmira Miotello Cipriano (a1) and Paulo Fontoura Freitas (a2)

Abstract

Objectives:

To detect the occurrence of surgical-site infection (SSI) in our study sample, using the traditional variables of the National Nosocomial Infection Surveillance (NNIS) index with a locally modified cut-off point for the “T time” defining length of surgical procedure; to compare the modified and the traditional NNIS index under the hypothesis that a cut-off point discriminating procedures of short and long duration, based upon the actual experience of the study sample, can adequately predict the risk of SSI.

Design:

A retrospective chart review of 9,322 patients undergoing surgical procedures in the period January 1993 to December 1998.

Setting:

A small university hospital (UH) in southern Brazil.

Results:

The composite index using the local sample procedure-duration cut-off point (UH-index) performed better than any of the individual components of the composite index (anesthesia risk index and surgical-wound class [SWC]). The UH-index also predicted adequately the risk of SSI when compared to the traditional NNIS index, particularly when stratifying by SWC.

Conclusions:

A modified NNIS index, using the sample cut-off point, can adequately predict the risk of SSI in a given population. Further studies are needed to compare and validate the NNIS index of risk for populations other than those of the NNIS-participating hospitals. Larger samples using different hospitals with similar characteristics are needed to investigate the risk of SSI associated with specific operations.

Copyright

Corresponding author

Rua Rui Barbosa, 135, 401, CEP 88025-300, Florianópolis, Santa Catarina, Brazil

References

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