Evaluation of Bivalirudin Dosing in Pediatric Extracorporeal Membrane Oxygenation with Renal Insufficiency or Renal Replacement Therapy.

Bivalirudin offers several important advantages of relevance to the management of extracorporeal membrane oxygenation (ECMO) patients. This multicenter retrospective analysis evaluated the bivalirudin dosing in pediatric ECMO and correlated these doses with the severity of renal dysfunction. A total of 75 patients were included in this analyses: estimated glomerular filtration rate (eGFR) > 60 ml/min/1.73 m 2 (n = 29), eGFR 30-60 (n = 18), eGFR < 30 (n = 28), and of those 23 were on renal replacement therapy (RRT). The initial bivalirudin dose used to reach therapeutic anticoagulation in patients with eGFR > 60 was significantly higher than the dose required in those with renal impairment (0.25 mg/kg/hr in patients with eGFR > 60 and 0.19 mg/kg/hr in patients on RRT, 0.18 mg/kg/hr in patients with eGFR 30-60 and 0.13 mg/kg/hr in patients with eGFR < 30 with no RRT). Progressive dose escalations (two to threefold increase) were required to maintain therapeutic range over the initial 4 days of ECMO that coincided with improving renal creatinine clearance during that same time period. Establishing an initial starting dose of bivalirudin contingent upon eGFR is essential for the rapid achievement of target anticoagulation intensity. Further dose adjustments guided by laboratory monitoring is necessary given the dynamic changes in creatinine clearance following ECMO initiation.