Abstract:
BACKGROUND AND OBJECTIVES:Dosing of vancomycin in pediatric patients undergoing continuous venous-venous hemodiafiltration (CVVHDF) is challenging. Characterization of vancomycin pharmacokinetics can assist with dosing and attainment of goal serum concentrations. DESIGN, SETTING, PARTICIPANTS, AND MEASUREMENTS:Patients less than 19 years of age who received vancomycin and had post-dose vancomycin concentrations while undergoing CVVHDF were identified. Data collection included the following: patient demographics, vancomycin dosing and serum concentrations, CVVHDF variables, serum creatinine (SCR), blood urea nitrogen (BUN), albumin, hematocrit, and urine output. Fat-free mass was calculated. Data were summarized with descriptive statistical methods, and population pharmacokinetic analysis was performed with NONMEM 7.2 and PDx-Pop 5.2. Simulation was performed to identify dosing regimens with the highest percentage of goal serum concentration < 20 mg/L and AUC0-24:MIC ≥ 400 attainment. RESULTS:A total of 138 patients met study criteria (45.6% male, median age 4.9 years (IQR (1.0, 14.5))). Mean vancomycin dose was 14.3 ± 1.6 mg/kg/dose (19.5 ± 3.0 mg/kg/dose by FFM). Patients had a median of six (IQR 2, 12) vancomycin serum concentrations sampled 13.6 ± 8.4 h after the dose, and the mean vancomycin serum concentration was 11.3 ± 3.4 mg/L. Vancomycin pharmacokinetics were characterized by a two-compartment model with allometric scaling on fat-free mass and significant covariates of SCR, BUN, dialysate flow rate, and ultrafiltration rate on clearance. Simulation identified doses of 40-50 mg/kg/day that divided every 8-12 h had the highest percentage of patients with a serum concentration < 20 mg/L and an AUC0-24:MIC ≥ 400. CONCLUSIONS:Vancomycin pharmacokinetics are characterized by fat-free mass, serum creatinine, blood urea nitrogen, dialysate flow rate, and ultrafiltration rate in the pediatric CVVHDF population. Dosing of 40-50 mg/kg/day on fat-free mass divided every 8-12 h with frequent vancomycin serum sampling is recommended.
journal_name
Eur J Clin Pharmacoljournal_title
European journal of clinical pharmacologyauthors
Moffett BS,Morris J,Munoz F,Arikan AAdoi
10.1007/s00228-019-02664-7subject
Has Abstractpub_date
2019-08-01 00:00:00pages
1089-1097issue
8eissn
0031-6970issn
1432-1041pii
10.1007/s00228-019-02664-7journal_volume
75pub_type
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journal_title:European journal of clinical pharmacology
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