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A narrative review of microbial biofilm in postoperative surgical site infections: clinical presentation and treatment

02 February 2019
Volume 3 · Issue 1

Abstract

Objective:

The global impact of surgical site infections (SSIs) on health-care systems is considerable: many are related to the formation of a microbial biofilm. Biofilm plays a significant role in the pathogenesis of implantable device-related infections and are also important in persistent postoperative skin and soft tissue wound infections.

Method:

PubMed and OVID databases were searched for relevant articles regarding biofilm-associated infection in surgery, including epidemiology, diagnosis, treatment and management.

Results:

Biofilm-associated infections increase the use of health-care resources, prolong length of stay, increase cost of antibiotic therapy, result in additional surgical revisions and extend rehabilitation after discharge from health care. Staphylococcus aureus and Staphylococcus epidermidis are the most common isolates recovered from device-related infections. Early infection occurs within two weeks of implantation and is associated with intraoperative wound contamination; late-onset infections are often occult prolonging recognition by weeks, months and in some cases, years. Biofilm is a physical barrier against antibodies and granulocytic cell populations which may also impede the penetration of antibiotics. The ideal strategy for preventing biofilm-associated SSI is to prevent intraoperative contamination through compliance with effective surgical care bundles. Management of postoperative biofilm-associated infections involves surgical debridement followed by irrigation with antimicrobial agents and removal of infected devices, followed by insertion of antimicrobial adjuncts such as antimicrobial spacers, beads or sutures together with selective therapeutic agents that penetrate the mature biofilm.

Conclusion:

Biofilm-associated infections are a significant source of postoperative morbidity and mortality. Appropriate interventional strategies are warranted to reduce the risk of intraoperative contamination.

The Centers for Disease Control and Prevention of the United States (CDC) has reported that 51.4 million inpatient surgical procedures were performed in the US in 2011, and approximately 400,000 of these procedures were complicated by a surgical site infection (SSI) with an associated mortality as high as 25%.1,2,3 Data available from Europe in 2009 indicate that in excess of 61 million surgical procedures were undertaken for inpatient surgery alone and it is likely that infection rates are similar to elsewhere in the world, imposing a significant burden on health-care resources, much of which in Europe is publicly funded.4

This global impact of SSIs on health-care systems is considerable and, according to some reports, as many as 80% of these SSIs may be related to the formation of a microbial biofilm.5,6,7,8 Many of the microbial populations associated with SSIs, and other chronic wounds, exist within the biofilm matrix as a heterogeneous community.9,10 The presence of a microbial biofilm, within host tissue or on the surface of a biomedical device, poses a significant clinical dilemma when attempting to eradicate subsequent infections. Biofilm-mediated infections exhibit resistance to host defences, often contributing to an excessive or inappropriate inflammatory response, leading to complement activation and formation of immune complexes, that in turn lead to tissue injury.11,12 In addition, biofilms are notoriously recalcitrant to antimicrobial therapy; often resulting in therapeutic failure following traditional parenteral antibiotic therapy.7,10

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