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Optimal Cefazolin Prophylactic Dosing for Bariatric Surgery: No Need for Higher Doses or Intraoperative Redosing

Xing Chen1, Collin E M Brathwaite2,3,4, Alexander Barkan2

  • 1Department Pharmacy, Winthrop-University Hospital, Mineola, NY, USA.

Obesity Surgery
|August 14, 2016
PubMed
Abstract

Insights

A single 2-g cefazolin dose before bariatric surgery provides adequate protective levels against methicillin-sensitive Staphylococcus aureus (MSSA). This dose ensures sufficient antibiotic concentration in adipose tissue, eliminating the need for intraoperative redosing.

Area of Science:

  • Pharmacokinetics
  • Infectious Disease
  • Surgical Prophylaxis

Background:

  • Methicillin-sensitive Staphylococcus aureus (MSSA) is a primary pathogen in bariatric surgery infections.
  • Effective antibiotic prophylaxis is crucial to prevent surgical site infections.

Purpose of the Study:

  • To determine if a single 2-g intravenous (IV) bolus dose of cefazolin achieves protective antibiotic levels in adipose tissue for bariatric surgery.
  • To evaluate cefazolin's pharmacokinetic profile in patients undergoing gastric bypass or sleeve gastrectomy.

Main Methods:

  • A pharmacokinetic study involving 37 patients undergoing bariatric surgery.
  • Cefazolin concentrations were measured in serum and adipose tissue (subcutaneous and peri-gastric) via high-performance liquid chromatography.
  • Specimens were collected at incision and before skin closure.

Main Results:

  • Cefazolin penetration into adipose tissue was 6-8% of serum levels.
  • Despite lower tissue penetration, cefazolin concentrations in all adipose tissue samples exceeded the minimum inhibitory concentration (MIC) for MSSA.
  • The 2-g cefazolin dose maintained protective levels for an average of 4.8 hours.

Conclusions:

  • A single 2-g IV bolus of cefazolin given preoperatively is adequate for MSSA prophylaxis during bariatric surgery.
  • This dosage achieves protective adipose tissue levels for the typical duration of these procedures.
  • Higher doses (3-4 g) are unnecessary, and a single 2-g dose obviates the need for intraoperative redosing.
Keywords:
Antibiotic intraoperative redosingCefazolin pharmacokineticsSurgical antibiotic prophylaxis

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