A 10 day old infant with pulmonary atresia, ventricular septal defect, and collateral pulmonary blood supply through a left sided ductus arteriosus developed complete shunt thrombosis four days after the creation of a modified Blalock-Taussig shunt. Recombinant tissue plasminogen activator was given locally into the proximal end of the shunt as two bolus injections of 0.1 mg/kg and two bolus injections of 0.2 mg/kg over 10 minutes, followed by a continuous infusion of 1.4 mg/kg/day for 16 hours and 0.7 mg/kg/day for 18 hours with systemic low dose heparin 5 IU/kg/h. This resulted in complete clot dissolution and reperfusion without haemorrhagic complications and without laboratory signs of systemic fibrinolytic activation.
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