Study Objective: To evaluate traditional nomogram (TN) versus individualized pharmacokinetic gentamicin dosing practices in neonatal intensive care units, focusing on achieving target therapeutic concentrations (peak > 8 microg/ml, trough < 2 microg/ml), number of dosing changes, number of concentrations obtained, and evidence of nephrotoxicity.
Design: Retrospective chart review.
Setting: Three neonatal intensive care units.
Patients: Three hundred nine infants prescribed gentamicin.
Intervention: None.
Measurements And Main Results: Sixty-seven percent of patients receiving pharmacokinetic dosing had initial peak concentrations of 8 microg/ml or greater compared with 7% of patients receiving TN dosing (p<0.001). Trough concentrations exceeding 2 microg/ml were reported in 23% of patients receiving TN dosing compared with 2% of pharmacokinetic-dosed patients (p<0.001). Forty-two percent and 6%, respectively, required dosage adjustments (p<0.01). The mean number of concentrations obtained per patient was 2.8 and 2.1, respectively (p<0.01). Neither group had evidence of gentamicin-related nephrotoxicity.
Conclusion: Compared with TN dosing, administering gentamicin loading doses and performing initial pharmacokinetic analysis resulted in rapid attainment of desired concentrations and fewer dosage adjustments, and allowed for a decrease in the number of gentamicin concentrations.
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