A 14-year study of heparin-induced thrombocytopenia

The American Journal of Medicine
T E Warkentin, J G Kelton

Abstract

To determine the sites of thromboses (venous versus arterial circulation) that complicate the clinical course of immunemediated heparin-induced thrombocytopenia, and to determine the 30-day risk for thrombosis in patients who are initially recognized with isolated heparin-induced thrombocytopenia. We analyzed objectively documented thrombotic events that complicated the clinical course of 127 patients with serologically confirmed heparin-induced thrombocytopenia identified in one medical community over a 14-year period. We classified heparin-induced thrombocytopenia patients into two groups: patients recognized with heparin-induced thrombocytopenia only after a new thrombosis had occurred, and patients initially recognized with isolated heparin-induced thrombocytopenia. We determined the subsequent 30-day risk for thrombosis for the cohort of patients initially recognized with isolated thrombocytopenia. Heparin-induced thrombocytopenia was associated with the development of new venous thrombotic events and arterial thrombotic events in 78 and 18 patients, respectively (ratio venous/arterial thrombosis = 4:1). Pulmonary embolism was the most common life-threatening thrombotic event, occurring in 25% of all patients. Approximatel...Continue Reading

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