[The recurrence of pulmonary embolism during heparin therapy after thrombolysis in the acute phase: a clinical case report].

We report a case of a 61-year-old woman admitted to our Coronary Care Unit for pulmonary embolism following cholecystectomy. After thrombolytic therapy, and during treatment with heparin (administered as a continuous intravenous infusion in the standard dose), the patient had a recurrence of pulmonary embolism and a subsequent implant of a Gianturco-Rohem vena cava filter. The patient presented an initial reduction in the number of platelets from 477 x 10(3)/microliters to 360 x 10(3)/microliters that was ascribed to a heparin side effect or to a blocking of the platelets in a massive pulmonary thrombosis. A predischarge platelet count, however, showed an elevated number of thrombocytes (944 x 10(3)/microliters) and hyperfibrinogenemia (fibrinogen = 750 mg/dl). Essential thrombocythemia was demonstrated and treated with interferon alpha-2b-recombinant 3,000,000 U.I. on alternate days with a reduction in platelets to 450 x 10(3)/microliters. This case demonstrates the necessity of exploring, during pulmonary embolism, all possible causes of hypercoagulability in the course of thrombolytic therapy.