Abstract
Thrombocytopenia develops in some patients with advanced pulmonary arterial hypertension (PAH) while receiving IV epoprostenol therapy. In this study, we evaluate whether epoprostenol use, other PAH medication use, hemodynamics, or PAH etiology are associated with thrombocytopenia in PAH. Platelet counts were evaluated in 47 PAH patients receiving IV epoprostenol, and in 44 patients with an inadequate response to initial therapy with oral agents in a cross-sectional study. Associations between thrombocytopenia (platelet count < 150,000/mL) and epoprostenol use, hemodynamics, PAH etiology, and use of other PAH medications were evaluated in univariable and multivariable analyses. PAH subtypes included idiopathic (69%), fenfluramine (18%), connective tissue disease (10%), and congenital heart disease (2%)-associated PAH. Thrombocytopenia was observed in 34% of patients treated with epoprostenol, compared with 15% of patients receiving oral therapy (odds ratio [OR], 2.9; p < 0.05), and the association between epoprostenol and thrombocytopenia remained significant after adjustment for differences in hemodynamics (OR, 5.0; p < 0.05). Right atrial pressure (OR, 1.12 per mm Hg; p < 0.05) and mixed venous oxygen saturation (Svo(2)) [OR,...Continue Reading
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