Which antibiotic is given for bowel preparation for LIS PROCEDURE PRE OPERATIVELY
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The textbook section on LIS (Lateral Internal Sphincterotomy) in Pfenninger and Fowler's Procedures for Primary Care does not specifically mention a preoperative antibiotic for bowel preparation. The procedure section covers patient preparation, technique, and complications without prescribing a specific antibiotic regimen for bowel prep.
However, based on standard surgical practice and colorectal surgery guidelines (which the textbooks do cover for similar anorectal procedures), here is the answer:
Preoperative Antibiotic for Bowel Preparation — LIS
For Lateral Internal Sphincterotomy (LIS) — a procedure on the anorectal region — the standard preoperative antibiotic used for bowel preparation follows the oral antibiotic bowel prep protocol commonly used in colorectal/anorectal surgery:
Oral Antibiotics (given the evening before surgery, combined with mechanical prep):
| Antibiotic | Rationale |
|---|---|
| Metronidazole (500 mg) | Covers anaerobes (Bacteroides, Clostridium) |
| Neomycin (1 g) | Covers gram-negative aerobes (E. coli) |
These two are classically given together (neomycin + metronidazole, orally, the day before surgery — typically at 1 PM, 2 PM, and 11 PM if on a full prep schedule).
Parenteral (IV) Prophylaxis at Induction:
- Metronidazole + Cefazolin (or a single agent like Co-amoxiclav/Amoxicillin-clavulanate) is given IV at induction of anesthesia to cover both aerobic and anaerobic organisms from the bowel flora.
Key Point:
Since LIS is a minor anorectal procedure (not a formal bowel resection), many centers perform it with:
- A phosphate/glycerin enema the morning of surgery (mechanical prep)
- A single dose of IV metronidazole ± cefazolin at induction
Full oral neomycin + metronidazole bowel prep is more relevant to major colorectal surgery but may still be prescribed depending on the institution's protocol.
Most commonly cited answer in surgical exams: Metronidazole + Neomycin (oral) for bowel preparation prior to anorectal procedures like LIS.
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