Abstract
Background
The benefit of adding oral antibiotic prophylaxis (OA) to intravenous prophylaxis (IV) in elective colorectal surgery to prevent surgical site infection (SSI) and whether the benefit of OA requires a mechanical bowel cleansing (MBP) are assessed in a systematic review. Meta-analyses compare randomized trials of IV versus IV plus OA, both with MBP; OA versus IV plus OA, both again with MBP; OA plus IV in studies randomizing patients to MBP or no MBP; and IV versus IV plus OA in patients with no MBP.
Methods
MEDLINE, EMBASE, and the Cochrane Library were searched for eligible studies from 1965 to April 1, 2020. The outcome assessed was SSI, superficial and deep, but not organ space. For each included study, risk of bias was assessed using the Cochrane Risk of Bias tool version 1. For each comparison, meta-analysis was performed from data from eligible studies to obtain a summary effect and heterogeneity using RevMan. Sensitivity analyses were performed excluding studies of poor quality. Certainty of evidence was assessed using GRADE for each comparison.
Results
Sixty-one studies published in 1971–2020 from 55 publications reporting 12,297 patients were eligible for inclusion. A total of 36 studies compared IV to OA plus IV with MBP. The risk ratio (RR) and 95% confidence interval (CI) for SSI with oral and IV vs. IV alone are 0.47, 0.40–0.56. The RR in 19 studies for IV plus OA versus OA alone is 0.48, 0.38–0.62. The RR for OA plus IV with MBP versus without MBP in 5 studies is 1.17, 0.84–1.64. The RR for OA plus IV versus IV alone when no bowel prep was used in two studies is 0.36, 0.18–0.72. RRs were similar in sensitivity analyses. The GRADE is high for the first two comparisons, moderate for the 3rd, and low for the 4th due to imprecision and heterogeneity.
Conclusions
Combined OA and IV is superior to either alone in preventing SSI. The certainty of evidence is such that further research is unlikely to alter this relationship when MBP is used. In randomized trials of MBP, OA plus IV shows no benefit from MBP versus no MBP. The last comparison shows in just two studies that as in the first meta-analysis, but in the absence of MBP, combined OA plus IV is also superior to IV alone.
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Appendix
Appendix
Search strategy
MEDLINE (OVID)
1. exp Surgical Wound Infection/
2. exp Postoperative Complications/
3. exp Bacterial Infections/
4. exp Infection/
5. exp Sepsis/
6. (postoperative complication* or infection* or sepsis).mp.
7. 1 or 2 or 3 or 4 or 5 or 6
8. exp Anti-Infective Agents/
9. exp Anti-Bacterial Agents/
10. (Anti infective or antibiotic* or antimicrobial* or anti bacterial*).mp.
11. exp Colorectal Surgery/
12. exp Colon/
13. exp Rectum/
14. exp Colectomy/
15. exp Colostomy/
16. (colon or rectum or rectal or colorectal or colectomy or colostomy).mp.
17. 8 or 9 or 10
18. 11 or 12 or 13 or 14 or 15 or 16
19. 7 and 17 and 18
20. randomized controlled trial.pt.
21. controlled clinical trial.pt.
22. randomized.ab.
23. placebo.ab.
24. clinical trial.sh.
25. randomly.ab.
26. trial.ti.
27. 20 or 21 or 22 or 23 or 24 or 25 or 26
28. humans.sh.
29. 27 and 28
30. 19 and 29
EMBASE (OVID)
1. exp surgical infection/
2. exp postoperative complication/
3. exp bacterial infection/
4. exp infection/
5. exp sepsis/
6. (postoperative complication* or infection* or sepsis).m_titl.
7. 1 or 2 or 3 or 4 or 5 or 6
8. exp antiinfective agent/
9. exp antibiotic agent/
10. (anti infective or antibiotic* or antimicrobial* or anti bacterial).m_titl.
11. 8 or 9 or 10
12. exp colorectal surgery/
13. exp colon/
14. exp rectum/
15. exp colon resection/
16. exp colostomy/
17. (colon or rectum or rectal or colorectal or colectomy or colostomy).m_titl. 18. 12 or 13 or 14 or 15 or 16 or 17
18. 7 and 11 and 18
19. randomized controlled trial/
20. randomization/
21. controlled study/
22. multicenter study/
23. phase 3 clinical trial/
24. phase 4 clinical trial/
25. double blind procedure/
26. single blind procedure/
27. ((singl* or doubl* or trebl* or tripl*) adj (blind* or mask*)).ti,ab.
28. (random* or cross* over* or factorial* or placebo* or volunteer*).ti,ab. 30. 25 or 22 or 26 or 28 or 21 or 27 or 23 or 20 or 29 or 24
29. "human*".ti,ab.
30. (animal* or nonhuman*).ti,ab.
33. 32 and 31
34. 32 not 33
35. 30 not 34
36. 19 and 35
The Cochrane Library
#1 MeSH descriptor Surgical Wound Infection explode all trees
#2 MeSH descriptor Postoperative Complications explode all trees #3 MeSH descriptor Bacterial Infections explode all trees
#4 MeSH descriptor Infection explode all trees #5 MeSH descriptor Sepsis explode all trees
#6 (postoperative complication* or infection* or sepsis):ti,ab,kw #7 (#1 OR #2 OR #3 OR #4 OR #5 OR #6)
#8 MeSH descriptor Anti-Infective Agents explode all trees #9 MeSH descriptor Anti-Bacterial Agents explode all trees
#10 (anti infective or antibiotic* or antimicrobial* or anti bacterial*):ti,ab,kw #11 (#8 OR #9 OR #10)
#12 MeSH descriptor Colorectal Surgery explode all trees #13 MeSH descriptor Colon explode all trees
#14 MeSH descriptor Rectum explode all trees #15 MeSH descriptor Colectomy explode all trees #16 MeSH descriptor Colostomy explode all trees
#17 (colon or rectum or rectal or colorectal or colectomy or colostomy):ti,ab,kw #18 (#12 OR #13 OR #14 OR #15 OR #16 OR #17)
#19 (#7 AND #11 AND #18)
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Nelson, R.L., Hassan, M. & Grant, M.D. Antibiotic prophylaxis in colorectal surgery: are oral, intravenous or both best and is mechanical bowel preparation necessary?. Tech Coloproctol 24, 1233–1246 (2020). https://doi.org/10.1007/s10151-020-02301-x
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DOI: https://doi.org/10.1007/s10151-020-02301-x