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Updated: Aug 6, 2026

Murine Ileocolic Bowel Resection with Primary Anastomosis
Published on: October 29, 2014
Mechanical bowel preparation for colorectal surgery
Francesca Rovera1, Gianlorenzo Dionigi, Luigi Boni
1Department of Surgical Sciences, University of Insubria, Varese, Italy. Francesca.rovera@uninsubria.it
Background:
Nosocomial infections are the most frequent complications of surgical patients. Most surgical site infections (SSI) are acquired intraoperatively and arise from the flora of the patient's skin, gastrointestinal tract, or mucous membranes. Although preoperative mechanical cleansing of the bowel is considered by many surgeons a cornerstone of modern elective colorectal surgery and, in association with antibiotic prophylaxis, a fundamental component of an intestinal antisepsis program, many surgeons do not perform preoperative mechanical preparation routinely.
Methods:
Review of the pertinent literature.
Results:
Some recent randomized trials and a Cochrane review found no proof that mechanical bowel preparation reduces the risk of complications after elective colorectal surgery. Indeed, there is some evidence that this intervention is associated with a higher rate of anastomotic leakage and wound complications.
Conclusions:
The dogma that mechanical bowel preparation is necessary before elective colorectal surgery may need to be reconsidered. On the other hand, such preparation decreases operating time by improving bowel handling during construction of the anastomosis. Moreover, it is helpful when intestinal palpation will be necessary for identification of a lesion.
Insights
Mechanical bowel preparation before elective colorectal surgery is not proven to reduce complications. Some evidence suggests it may increase anastomotic leakage and wound issues, challenging its routine use.
Area of Science:
- Colorectal Surgery
- Surgical Infections
- Patient Outcomes
Background:
- Nosocomial infections are common in surgical patients, with surgical site infections (SSIs) often originating from patient flora during surgery.
- Preoperative mechanical bowel preparation, alongside antibiotic prophylaxis, is a traditional component of intestinal antisepsis for elective colorectal surgery.
- However, routine preoperative mechanical bowel preparation is not universally adopted by surgeons.
Purpose of the Study:
- To evaluate the necessity and impact of mechanical bowel preparation in elective colorectal surgery.
- To review current evidence regarding the efficacy and risks associated with mechanical bowel preparation.
Main Methods:
- A comprehensive review of relevant medical literature was conducted.
- Analysis included recent randomized controlled trials and a Cochrane review.
Main Results:
- Current evidence does not support a reduction in complications from mechanical bowel preparation in elective colorectal surgery.
- Some studies indicate an increased risk of anastomotic leakage and wound complications with this intervention.
Conclusions:
- The traditional requirement for mechanical bowel preparation before elective colorectal surgery warrants re-evaluation.
- While not reducing complications, bowel preparation can decrease operating time and aid in lesion identification during surgery.
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