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The myth of the second prophylactic antibiotic dose in aortoiliac reconstructions
M S van Dijk-van Dam1, F L Moll, J A de Letter
1Department of Vascular Surgery, St Antonius Hospital, Nieuwegein, The Netherlands.
Objectives:
To determine whether a prophylactic second dose of antibiotics is justified when severe blood loss and/or prolonged operation time occurs during aortoiliac reconstructions.
Methods:
We measured the cefuroxime concentration in venous blood serum and subcutaneous fat tissue of 30 patients who underwent elective aortoiliac reconstruction after a single intravenous dose of 1500 mg cefuroxime.
Results:
The mean blood loss was 1912 ml (range 200-7000). The mean operation time was 212 min (range 70-330). The cefuroxime concentration in blood serum 30 min after the gift varied from 53.7-561.6 mg/l and during closure of the abdominal incision from 13.2-90.0 mg/l. Taking the minimum inhibitory concentration for Staphylococcus species as 1.0 mg/l, we found an adequate prophylactic serum cefuroxime concentration in all patients. There was a statistically significant correlation between serum cefuroxime concentration and blood loss (p = 0.01) and operation time (p = 0.0001).
Conclusions:
Although serum concentration of cefuroxime is greatly influenced by blood loss and operation time, a second dose of cefuroxime in aortoiliac reconstructions is not necessary if the operation is completed within 5.5 h and if perioperative blood loss does not exceed 7000 ml.
Insights
A single dose of cefuroxime is sufficient for antibiotic prophylaxis in aortoiliac reconstructions, even with significant blood loss or long operation times. This study found adequate drug concentrations in all patients, suggesting a second dose is unnecessary.
Area of Science:
- Surgical Infections
- Pharmacokinetics
- Antibiotic Prophylaxis
Background:
- Aortoiliac reconstructions are complex surgeries with risks of severe blood loss and prolonged operation times.
- Antibiotic prophylaxis is crucial to prevent surgical site infections in these procedures.
- The necessity of a second antibiotic dose in prolonged or complex surgeries is often debated.
Purpose of the Study:
- To evaluate the adequacy of cefuroxime serum and tissue concentrations following a single prophylactic dose during aortoiliac reconstructions.
- To determine if severe blood loss or extended operation times necessitate a second dose of cefuroxime.
Main Methods:
- 30 patients undergoing elective aortoiliac reconstruction received a single intravenous dose of 1500 mg cefuroxime.
- Cefuroxime concentrations were measured in venous blood serum and subcutaneous fat tissue.
- Blood loss and operation duration were recorded for each patient.
Main Results:
- Mean blood loss was 1912 ml (range 200-7000 ml) and mean operation time was 212 minutes (range 70-330 min).
- All patients maintained adequate prophylactic cefuroxime concentrations (≥1.0 mg/l) in serum.
- A significant correlation was observed between serum cefuroxime levels and both blood loss (p=0.01) and operation time (p=0.0001).
Conclusions:
- Serum cefuroxime concentrations are significantly influenced by blood loss and operation duration.
- A second dose of cefuroxime is not required for aortoiliac reconstructions if the operation time is within 5.5 hours and blood loss is below 7000 ml.
- Single-dose cefuroxime prophylaxis is effective in preventing infections during these procedures under the specified conditions.