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Pharmacokinetics and tissue concentrations of cefazolin in pediatric patients undergoing gastrointestinal surgery
M C Nahata1, D E Durrell, M E Ginn-Pease
1College of Pharmacy, Ohio State University, Columbus 43210.
Insights
This study shows that cefazolin dosing is adequate for pediatric gastrointestinal surgery. Cefazolin tissue concentrations remain above minimum inhibitory levels, ensuring infection protection in children.
Area of Science:
- Pharmacology
- Pediatric Surgery
- Infectious Disease Prevention
Background:
- Limited data exists on cefazolin pharmacokinetics and tissue penetration in pediatric patients.
- Understanding drug behavior in children is crucial for effective treatment and infection prevention.
- Gastrointestinal surgery in pediatric patients requires appropriate antibiotic prophylaxis.
Purpose of the Study:
- To evaluate the pharmacokinetics and tissue penetration of cefazolin in pediatric patients undergoing gastrointestinal surgery.
- To determine if current cefazolin dosing regimens provide adequate antimicrobial coverage in this population.
- To assess cefazolin serum and muscle tissue concentrations during and after surgery.
Main Methods:
- Nine pediatric patients (0.8-10 years) received a single intravenous dose of cefazolin (15-26 mg/kg).
- Blood samples were collected during surgery and recovery; rectus abdominis muscle biopsies were obtained at incision and closure.
- Cefazolin concentrations were quantified using high-performance liquid chromatography (HPLC).
Main Results:
- Peak serum cefazolin concentrations ranged from 85.8-269.4 mcg/ml.
- Serum and tissue concentrations at incision were 50.5-169.9 mcg/ml and 1.8-29.7 mcg/g, respectively.
- Elimination half-life was 1.68 +/- 0.55 hours, with tissue concentrations exceeding minimum inhibitory levels.
Conclusions:
- The current cefazolin dosing regimen is sufficient for infection prophylaxis in pediatric patients undergoing gastrointestinal surgery.
- Adequate cefazolin levels in serum and muscle tissue suggest effective antimicrobial activity.
- Further pharmacokinetic studies in pediatric populations are warranted to optimize antibiotic therapy.
Abstract:
Limited information is available on the pharmacokinetics and tissue penetration of cefazolin in pediatric patients. Nine children (age 0.8-10 years) undergoing gastrointestinal operations were studied. A single dose of cefazolin, 15-26 mg/kg was given i.v. over 2-3 min at the time of induction of anaesthesia. Multiple (5-8) blood samples were collected during the operative procedure and in the recovery room. Tissue samples from the rectus abdominis muscle were obtained at the time of incision, during surgery, and at closure. The concentration of cefazolin was measured by a high performance liquid chromatographic method. Peak serum concentrations of cefazolin ranged from 85.8-269.4 mcg/ml. Serum and tissue concentrations at incision were 50.5-169.9 mcg/ml and 1.8-29.7 mcg/g; at closure the serum and tissue concentrations ranged from 17.3-60.9 mcg/ml and 1.19-29.70 mcg/g, respectively. Total clearance, apparent distribution volume, and elimination half-life of cefazolin were 1.43 +/- 0.54 ml/min/kg, 0.08 +/- 0.03 l/kg, and 1.68 +/- 0.55 h respectively. Tissue concentrations of cefazolin were maintained above its minimum inhibitory concentrations against common susceptible pathogens. Hence, the current dosing regimen of cefazolin is adequate to protect against infection in pediatric patients undergoing gastrointestinal surgery.