• Maria M J van der Vorst, Jan den Hartigh, Enno Wildschut, Dick Tibboel, and Jacobus Burggraaf.
• Centre for Human Drug Research, Leiden, The Netherlands.
• Crit Care. 2007 Jan 1;11(5):R111.

IntroductionThe objective of the present study was to explore a continuous intravenous furosemide regimen that adapts to urine output in neonates treated with extracorporeal membrane oxygenation (ECMO).MethodsSeven neonates admitted to a paediatric surgical intensive care unit for ECMO therapy were treated with a furosemide regimen consisting of a loading bolus (1-2 mg/kg) followed by a continuous infusion at 0.2 mg/kg per hour, which was adjusted according to the target urine production of 6 ml/kg per hour. Therapeutic drug monitoring for furosemide concentrations in blood was performed.ResultsThe mean +/- standard deviation furosemide dose was 0.17 +/- 0.06 mg/kg per hour, 0.08 +/- 0.04 mg/kg per hour and 0.12 +/- 0.07 mg/kg per hour, respectively, on the first day, second day and third day of the study. The median (range of the urine production of the study subjects) urine production over the consecutive study days was 6.8 (0.8-8.4) mg/kg per hour, 6.0 (4.7-8.9) mg/kg per hour and 5.4 (3.4-10.1) ml/kg per hour. The target urine production was reached after a median time of 7 (3-37) hours. The regimen was haemodynamically well tolerated and the median furosemide serum concentration was 3.1 (0.4-12.9) mug/ml, well below the toxic level.ConclusionThe evaluated furosemide infusion appears an effective means to reduce volume overload in neonates treated with ECMO. The data of this preliminary study suggest that the starting dose of furosemide was too high, however, because the urine output was excessive and required frequent adaptations. The results of this study therefore indicate that a novel pharmacokinetic/pharmacodynamic model needs to be developed for neonates treated with ECMO.

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