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Therapeutic Drug Monitoring of Continuous Infusion Doripenem in a Pediatric Patient on Continuous Renal Replacement Therapy.
Journal of Pediatric Pharmacology and Therapeutics : JPPT : the Official Journal of PPAG 2017 January
An 11-year-old African American male with severe combined immunodeficiency variant, non-cystic fibrosis bronchiectasis, pancreatic insufficiency, chronic mycobacterium avium-intracellulare infection, chronic sinusitis, and malnutrition presented with a 1-week history of fevers. He subsequently developed respiratory decompensation and cefepime was discontinued and doripenem was initiated. Doripenem was the carbapenem used due to a national shortage of meropenem. By day 7 the patient (24.7 kg) had a positive fluid balance of 6925 mL (28% FO), and on days 7 into 8 developed acute kidney injury evidenced by an elevated serum creatinine of 0.68 mg/dL, an increase from the baseline of 0.28 mg/dL. On day 9, the patient was initiated on continuous renal replacement therapy (CRRT) and the doripenem dosing was changed to a continuous infusion of 2.5 mg/kg/hr (60 mg/kg/day). Approximately 12.5 hours after the start of the doripenem a serum concentration was obtained, which was 4.01 mg/L corresponding to a clearance of 10.5 mL/min/kg. The pediatric dosing and pharmacokinetic data available for doripenem suggest a clearance estimate of 4.4 to 4.8 mL/min/kg, and the adult clearance estimate is 2.4 to 3.78 mL/min/kg. The calculated clearance in our patient of 10.5 mL/min/kg is over double the highest clearance estimate in the pediatric literature. This case demonstrates that doripenem clearance is significantly increased with CRRT in comparison with the published pediatric and adult data. An appropriate pharmacodynamic outcome (time that free drug concentration > minimum inhibitory concentration) can be achieved by continuous infusion doripenem with concurrent therapeutic drug monitoring.
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