In surgical practice, the use of antibiotics in the perioperative period helps reduce the risk of surgical site infections (SSIs). SSIs can result in prolonged hospitalizations, increased medical costs, and higher rates of patient mortality. The fundamental principle of this practice is to deliver an effective concentration of an antimicrobial agent to neutralize both the patient’s own skin flora and any environmental bacteria before they can establish an infection.
Timing is perhaps the most critical determinant of success in perioperative antibiotic use. Clinical evidence strongly supports the administration of systemic antibiotics within the sixty minutes immediately preceding the surgical incision. This window ensures that the drug has reached its peak concentration in the relevant tissues when the risk of contamination is highest. Certain medications that require longer infusion times, such as vancomycin or fluoroquinolones, may necessitate a start time of up to one hundred and twenty minutes prior to incision. Conversely, starting antibiotics after the procedure has already begun has been shown to offer significantly less protection and can lead to higher infection rates.
One of the most persistent misconceptions in surgical care is the belief that extending the duration of prophylactic antibiotic use after a procedure provides superior protection. However, current guidelines indicate that for the vast majority of operations, a single preoperative dose is sufficient. While intraoperative redosing may be required if a surgery lasts beyond several hours or involves significant blood loss, continuing prophylactic antibiotics postoperatively—especially beyond twenty-four hours—offers no additional benefit in reducing SSIs. Furthermore, the unnecessary prolongation of antibiotic therapy is a primary driver of the global crisis of antimicrobial resistance (AMR), as it exposes bacteria to drugs for long enough to allow them to develop defensive mechanisms.
The selection of a specific antibiotic must be tailored to the likely pathogens associated with a given procedure. For many clean surgeries, cefazolin is the standard choice due to its effectiveness against common skin bacteria like Staphylococcus aureus. However, the rise of resistant strains such as methicillin-resistant Staphylococcus aureus (MRSA) has led many institutions to implement screening and decolonization protocols, particularly for high-risk cardiac and orthopedic procedures. In colorectal surgery, a specialized approach involving a combination of mechanical bowel preparation and oral antibiotics is recommended to address the complex microbial environment of the digestive tract.
Optimizing perioperative antibiotic use also requires careful consideration of individual patient factors. For instance, patients with obesity often require higher doses of antibiotics to achieve therapeutic tissue levels. Additionally, many patients are incorrectly labeled as having penicillin allergies, which can lead clinicians to use alternative medications that may be less effective or present more side effects. Navigating these complexities requires a multidisciplinary effort involving surgeons, anesthetists, and pharmacists. By adhering to evidence-based guidelines and practicing rigorous antibiotic stewardship, the medical community can continue to improve surgical outcomes while mitigating the long-term threat of drug-resistant bacteria.
References
- Bratzler, D. W. et al. Clinical practice guidelines for antimicrobial prophylaxis in surgery. Am. J. Health-Syst. Pharm. 70, 195–283 (2013). [https://academic.oup.com/ajhp/article/70/3/195/5112717]
- World Health Organization. Global Guidelines for the Prevention of Surgical Site Infection (2016). [https://www.who.int/publications/i/item/9789241549639]
- Heal, C. F. et al. Topical antibiotics for preventing surgical site infection in wounds healing by primary intention. Cochrane Database Syst. Rev. 11, CD011426 (2016). [https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD011426.pub2/full]
- Rollins, K. E., Javanmard-Emamghissi, H. & Lobo, D. N. The role of oral antibiotic preparation in elective colorectal surgery: a meta-analysis. Ann. Surg. 270, 43–58 (2019). [https://journals.lww.com/annalsofsurgery/Fulltext/2019/07000/The_Role_of_Oral_Antibiotic_Preparation_in.13.aspx]
- Menz, B. D. et al. Surgical antibiotic prophylaxis in an era of antibiotic resistance: common resistant bacteria and wider considerations for practice. Infect. Drug Resist. 14, 5235–5252 (2021). [https://www.dovepress.com/surgical-antibiotic-prophylaxis-in-an-era-of-antibiotic-resistance-comm-peer-reviewed-fulltext-article-IDR]