PROPHYLACTIC ANTIBIOTICS PRIOR TO CESAREAN SECTION IN OBESE WOMEN

Study Overview
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Brief Summary
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Surgical site infections are common and a cause of major morbidity. They are also more common in obese women. Cesarean sections are the most common surgery performed in the United States, therefore pregnant women are being faced with this problem frequently. There is evidence to show that prophylactically administered antibiotics, cefazolin specifically, to obese women prior to cesarean section do not reach adequate concentrations in adipose tissue to prevent infection. The purpose of this study is to evaluate if an increased dose of cefazolin will attain adequate tissue concentration in obese women. Our hypothesis is that three grams of cefazolin given no more than 60 minutes prior to the start of a cesarean section in an obese (Body mass index (BMI) greater than or equal to 30) woman will attain adequate adipose tissue concentration compared to two grams of cefazolin. Subjects will be selected if they are greater than 37 weeks gestation wiht a singleton pregnancy and require a cesarean section for any obstetrical indication. Women will be excluded if they have a suspected infection, have a multiple gestation, or have preexisting diabetes or hypertension with end organ damage. The subjects will be screened both by through the OR schedule as well as through the clinics. They will then be consented and enrolled by the primary investigator. Once enrolled the subjects will be randomized to receive either two grams or three grams of cefazolin as prophylactic antibiotics to be given no more than 60 minutes prior to the start of the surgery. Two adipose tissue samples will be obtained at the time of surgery. The first at the start after skin incision and the second at the end prior to closure of the skin. There will also be a separate IV placed at the start of the procedure from which three blood draws can be collected. These three samples will be obtained at the start of the surgery but after antibiotic administration, at the time of the first adipose collection, and at the time of the second adipose collection. The samples will then be stored at -80 degrees and shipped to David P. Nicolau's lab in Hartford, CT for the tissue and serum analysis. While the subjects are in the hospital recovering from their surgery, a chart review will be performed to determine if there are any infections occuring post-operatively. A telephone survey will be conducted six to eight weeks postpartum again assessing for any infectious complications after the cesarean section.

Official Title
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PROPHYLACTIC ANTIBIOTICS PRIOR TO CESAREAN SECTION IN OBESE WOMEN: Does Increasing the Dose Increase the Tissue Concentration?

Conditions
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Infection Prevention

Intervention / Treatment
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* Drug: Cefazolin


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Obese - body mass index (BMI) calculated as weight (kg)/ [height (m2)]greater than or equal to 30 as determined at their first prenatal visit Gestational age of 37 0/7 weeks and greater Singleton Pregnancy Non-emergent cesarean section Exclusion Criteria: Known cephalosporin allergy Severe allergy to penicillin making cephalosporin use a contraindication Exposure to antibiotics in the preceding 7 days Need for emergent cesarean section Multiple gestations Suspected chorioamnionitis Pre-gestational diabetes Chronic hypertension with evidence of end organ damage
Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Two grams cefazolin<br>Two grams of cefazolin will be given by intravenous bolus zero to 60 minutes prior to the start of the cesarean section. | Drug: Cefazolin<br> <br> |
| Active Comparator: Three grams cefazolin<br>Three grams of cefazolin will be given by intravenous bolus zero to 60 minutes prior to the start of the cesarean section. | Drug: Cefazolin<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Adipose tissue concentration of cefazolin | Two separate two gram samples of adipose tissue will be removed from the subcutaneous tissue. The first sample will be removed after skin incision, yet prior to fascial incision. The second sample will be collected after fascial closure, yet prior to skin closure. | At the start of the cesarean section and at the end of the cesarean section | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Serum cefazolin concentrations | Three separate intraoperative blood samples will be collected to evaluate the serum cefazolin concentrations. The first sample will be collected after antibiotic administration, prior to the surgery start. The next two samples will be collected coincidental to the time of adipose tissue collection. The first after skin incision, yet prior to fascial incision. The second after fascial closure, yet prior to skin closure. | After antibiotic infusion, at the start of the cesarean section, and at the end of the cesarean section | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Cefazolin, Tissue concentration, infection, cesarean section, obese