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Vancomycin and Ceftazidime Bioactivities Persist for at Least 2 Weeks in the Lumen in Ports: Simplifying Treatment of Port-Associated Bloodstream Infections by Using the Antibiotic Lock Technique

ABSTRACT The residual antibiotic concentration of vancomycin (2 mg/ml)- or ceftazidime (2 mg/ml)-heparin solutions instilled in ports in pediatric hematology-oncology patients 1 to 34 days earlier was measured. Antibiotic concentrations of ≥100 μg of either antibiotic per ml persisted for at least 21 days. For treatment of lumenal port infections, antibiotic-heparin dwell times of ≥2 weeks may be appropriate.