Discussion paperSurgical antibiotic prophylaxis – The evidence and understanding its impact on consensus guidelines
Introduction
Surgical antibiotic prophylaxis (SAP) refers to the utilisation of antibiotics for the prevention of surgical site infections (SSIs) [1]. SSIs impact on both the patient and health care system through increased mortality and morbidity, prolonged hospital admission, reduced quality of life and additional financial costs for ongoing inpatient and outpatient treatment [2].
There is an extensive body of literature demonstrating the efficacy of SAP for the prevention of SSI [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47]. Optimal use of antimicrobials in the operative setting includes prescribing the correct antimicrobial when indicated and adhering to the recommended drug dose, route and timing of administration, and duration [1], [6], [48]. The strength of the evidence for SAP efficacy varies greatly for different procedures and there is a wide range of guidelines available to assist clinical practice. The quality of the evidence behind these recommendations may influence prescriber perceptions, agreement with the guidelines, and their consequent prescribing behaviours [49], [50], [51], [52].
In Australian hospitals and general practice, Therapeutic Guidelines: Antibiotic (TG: Antibiotic) [3] is the recommended guideline for the prescribing of antimicrobials, including SAP [53], [54]. Guideline use is reinforced in the national Antimicrobial Stewardship Clinical Care Standards [55]. Based on data from the National Antimicrobial Prescribing Survey (NAPS) [56] and the Surgical National Antimicrobial Prescribing Survey (SNAPS) [57], SAP is the most common indication for antimicrobial use in Australian hospitals, accounting for 15.5% of antimicrobial prescriptions [56]. Notably, prescriptions for SAP also have the highest rate of inappropriate use (40.5%) [56].
This discussion aims to explore the quality of the literature for SAP that informs the current TG: Antibiotic Surgical Prophylaxis [3] recommendations and identify potential gaps between the evidence and these recommendations.
Section snippets
Literature search
The literature review focused on research classified as having Level 1 evidence according to the National Health and Medical Research Council (NHMRC) evidence hierarchy [58]. Level 1 evidence includes systematic reviews (SR) and meta-analyses (MA) of randomised controlled trials (RCTs); this was extended to include SR/MAs that reviewed both RCTs and non-RCTs.
The review involved keyword searches of three electronic databases (MEDLINE, EMBASE and Google Scholar). Key search terms such as
Findings
Overall, 50 SR and MAs were identified for the review [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47], [60], [61], [62], [63], [64], [65], [66], [67], [68], [69], [70]. Appendix 1 summarises the characteristics of the included reviews. Reviews included were published between 1990 and 2017. The majority of the
The evidence for surgical antibiotic prophylaxis
The majority of the published reviews demonstrated that SAP, when indicated, reduced the risk of SSIs [9], [10], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [31], [32], [33], [34], [35], [36], [37], [38], [39], [40], [41], [42], [43], [44], [45], [46], [47]. Table 1 shows that the majority of the TG: Antibiotic recommendations, particularly regarding the class of antimicrobial agent and effective duration, are supported by some
Conclusions
SSIs are complications of surgical care that may be prevented with appropriate SAP. Considerable evidence supports the use of SAP; however, there are gaps in the evidence behind recommendations for the most appropriate SAP regimen for different surgical procedures. The aim of expert consensus discussions during guideline development is to narrow these gaps, but guideline implementability and uptake are influenced by multiple factors, including the comprehensiveness of the evidence. This
Ethical considerations
As this is a discussion paper, ethical approval is not required.
Authorship statement
CI – conducted data analysis, developed analysis plan, wrote analysis, drafted and revised paper.
TP – developed analysis plan, revised paper.
DA – developed analysis plan, revised paper.
AR – revised paper.
CM – revised paper.
KT – developed analysis plan, revised paper.
Conflicts of interest
Nothing to declare.
Funding
No funding.
Provenance and peer review
Not commissioned; externally peer reviewed.
Acknowledgements
None.
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