title: Pentosan polysulfate-induced thrombocytopenia and thrombosis.
abstract: Pentosan polysulfate is a low-molecular-weight sulfated polysaccharide used as an antithrombotic drug. We present two patients who developed thrombocytopenia and venous thrombosis during treatment with pentosan polysulfate. The relationship between pentosan polysulfate and thrombocytopenia is supported by platelet aggregation and serotonin release tests. In the light of the literature and our two cases, it appears that pentosan polysulfate alone as standard heparin and low-molecular-weight heparin can induce thrombocytopenia and thrombosis. Platelet counts should therefore be periodically monitored during pentosan polysulfate treatment. In the case of pentosan polysulfate-induced thrombocytopenia, it seems that heparin or low-molecular-weight heparin should not be instituted during the acute phase even if platelet aggregation studies are negative, because of their low sensitivity. After remission of thrombocytopenia, whether or not glycosaminoglycans can be reinstituted, at least temporarily, after antibody had disappeared is still an open question.
authors.affiliation: Department of Hematology, CHU Hopital Nord, Saint-Etienne, France.
authors.forename: B
authors.initials: B
authors.lastname: Tardy-Poncet
authors.forename: B
authors.initials: B
authors.lastname: Tardy
authors.forename: F
authors.initials: F
authors.lastname: Grelac
authors.forename: J
authors.initials: J
authors.lastname: Reynaud
authors.forename: P
authors.initials: P
authors.lastname: Mismetti
authors.forename: J C
authors.initials: JC
authors.lastname: Bertrand
authors.forename: D
authors.initials: D
authors.lastname: Guyotat
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005268:Femoral Vein; D006801:Humans; D008875:Middle Aged; D010426:Pentosan Sulfuric Polyester / Q000009:adverse effects*; D010974:Platelet Aggregation / Q000187:drug effects; D012701:Serotonin / Q000378:metabolism; D012851:Sinus Thrombosis, Intracranial / Q000139:chemically induced; D013921:Thrombocytopenia / Q000139:chemically induced*; D013927:Thrombosis / Q000139:chemically induced*
chemical_list: D012701:Serotonin; D010426:Pentosan Sulfuric Polyester