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  • Title: Pharmacokinetics of once daily intraperitoneal cefazolin in continuous ambulatory peritoneal dialysis patients.
    Author: Low CL, Gopalakrishna K, Lye WC.
    Journal: J Am Soc Nephrol; 2000 Jun; 11(6):1117-1121. PubMed ID: 10820176.
    Abstract:
    This study determined the pharmacokinetic characteristics of once daily intraperitoneal (IP) cefazolin in continuous ambulatory peritoneal dialysis (CAPD) patients. Each of the 10 volunteer CAPD patients without active peritonitis received a single IP dose of 1 g of cefazolin sodium for a 6-h dwell. All patients underwent a fixed CAPD regimen comprising a first 6-h dwell followed by two 3-h dwells and a final 12-h overnight dwell. Blood and dialysate samples were collected at 0, 0.5, 1, 2, 3, 6 (end of first dwell), and 24 h after the administration of IP cefazolin. Any urine produced was collected over the 24-h study period. A validated HPLC method was used to analyze cefazolin in plasma, dialysate, and urine. The bioavailability was found to be 77.9 +/- 3.1%, volume of distribution 0.20 +/- 0.05 L/kg, and plasma half-life 39.9 +/- 25.4 h. Mean total, renal, and peritoneal clearances were 4.5 +/- 2.3, 1. 4 +/- 1.1, and 3.5 +/- 1.8 ml/min, respectively. Mean plasma and dialysate concentrations at 24 h were 42.8 +/- 14.3 and 31.8 +/- 11. 7 mcg/ml, respectively, well above the minimum inhibitory concentrations (MIC) of susceptible organisms. A once daily IP cefazolin dose of 500 mg/L gave desirable pharmacokinetic attributes for use as a suitable alternative to vancomycin for empiric treatment of CAPD-associated peritonitis.
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