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Mechanical bowel preparation for elective colorectal surgery.

K F Guenaga1, D Matos, A A Castro

  • 1Surgical Gastroenterology Department, Ferderal University of São Paulo, Marivaldo Fernandes, 152 apto. 13, Guarujá, São Paulo, Brazil. kaci@uol.com.br

The Cochrane Database of Systematic Reviews
|June 14, 2003
PubMed
Summary

Mechanical bowel preparation before colorectal surgery does not reduce anastomotic leak rates or other complications. This systematic review questions the routine use of mechanical bowel preparation in patients undergoing elective colorectal surgery.

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Area of Science:

  • Colorectal Surgery
  • Surgical Outcomes
  • Evidence-Based Medicine

Background:

  • The long-held belief that mechanical bowel preparation (MBP) prevents anastomotic leakage and infection after colorectal surgery lacks robust scientific evidence.
  • Current practices are largely based on observational data and expert opinions rather than randomized controlled trials.

Purpose of the Study:

  • To evaluate the safety and effectiveness of prophylactic mechanical bowel preparation (MBP) in reducing morbidity and mortality rates in elective colorectal surgery.
  • To test the hypothesis that MBP decreases postoperative complications.

Main Methods:

  • A systematic review and meta-analysis of randomized clinical trials (RCTs) comparing MBP with no MBP in elective colorectal surgery.
  • Searches were conducted across major databases (EMBASE, LILACS, MEDLINE, Cochrane Library) and conference proceedings.

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  • Data extraction and quality assessment were performed independently by two reviewers, with Peto's Odds Ratio used for analysis.

    • Main Results:

    • Analysis of 6 RCTs involving 1159 patients showed that MBP did not significantly reduce overall anastomotic leakage (5.5% vs 2.9%, P=0.02).
    • MBP was not associated with significant reductions in mortality, peritonitis, reoperation rates, or wound infections.
    • While overall anastomotic leakage was not reduced, a statistically significant increase was observed in the MBP group (P=0.02).

    Conclusions:

    • The findings do not support the hypothesis that mechanical bowel preparation reduces anastomotic leak rates or other postoperative complications in elective colorectal surgery.
    • The routine use of mechanical bowel preparation in this patient population is therefore questionable.
    • Further research may be needed to clarify the role, if any, of MBP in specific colorectal surgical contexts.