Metronidazole may inhibit intestinal colonization with Clostridium difficile

Area of Science:

• Gastroenterology
• Surgical Infectious Disease
• Pharmacology

Background:

• Antibiotics disrupt gut flora, leading to Clostridium difficile overgrowth and colitis.
• Oral metronidazole is a treatment for antibiotic-associated colitis.
• The role of metronidazole in preoperative bowel preparation for preventing C. difficile is unclear.

Purpose of the Study:

• To determine if oral metronidazole in preoperative bowel preparation reduces C. difficile incidence after colorectal surgery.
• To assess the efficacy of metronidazole in preventing antibiotic-associated colitis.

Main Methods:

• Prospective randomized study of 82 patients undergoing colorectal procedures.
• Two groups received oral antibiotics: neomycin/erythromycin (Group 1) or neomycin/metronidazole (Group 2).
• All patients had mechanical bowel preparation and received intravenous cefotetan; stool samples were tested for C. difficile toxin.

Main Results:

• Fewer patients in the neomycin/metronidazole group (1/40) had C. difficile positive stool compared to the neomycin/erythromycin group (5/42).
• The relative risk of C. difficile colonization was lower in the metronidazole group, though not statistically significant (P=0.202).
• No significant differences in age, gender, or length of hospital stay between groups.

Conclusions:

• Preoperative oral metronidazole may be associated with reduced intestinal colonization by C. difficile.
• Further research is needed to confirm the clinical benefit of metronidazole in this setting.
• Metronidazole's role in preventing C. difficile infection warrants consideration in colorectal surgery protocols.