title: Risk of thrombosis in patients with malignancy and heparin-induced thrombocytopenia.
abstract: Heparin-induced thrombocytopenia (HIT) is a common immunological drug reaction. After exposure to heparin, some patients develop heparin dependent antibodies with no evidence of thrombosis, while others are at risk of thrombocytopenia, thrombosis, limb loss, and death. We conducted a retrospective chart review on all patients serologically positive for HIT by HPIA ELISA in a single tertiary-care hospital, to determine whether patients with malignancy had an increased risk of thrombotic complications. Medical records of 55 patients who tested positive for HIT and met clinical criteria for HIT were analyzed. All patients had been treated with unfractionated heparin. Malignancy was diagnosed in 11 patients, either at surgery or post-mortem examination. A higher rate of venous thrombosis and pulmonary embolism was observed in patients with HIT and malignant disease when compared to patients with no underlying malignancy (odds ratio 13.6, 95% CI 2.9-63.8).
authors.affiliation: Division of Internal Medicine, Department of Medicine, McGill University Health Center, Royal Victoria Hospital Room A4.21, 687 Pine Avenue West, Montreal, Quebec, Canada H3A 1A1. Lucie_Opatrny@yahoo.ca
authors.forename: Lucie
authors.initials: L
authors.lastname: Opatrny
authors.forename: Margaret N
authors.initials: MN
authors.lastname: Warner
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000925:Anticoagulants / Q000627:therapeutic use; D002809:Chondroitin Sulfates / Q000627:therapeutic use; D003871:Dermatan Sulfate / Q000627:therapeutic use; D004338:Drug Combinations; D005260:Female; D006493:Heparin / Q000009:adverse effects*; D006497:Heparan Sulfate / Q000627:therapeutic use; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications*; D011655:Pulmonary Embolism / Q000453:epidemiology / Q000209:etiology; D012189:Retrospective Studies; D012307:Risk Factors; D013921:Thrombocytopenia / Q000139:chemically induced* / Q000150:complications* / Q000188:drug therapy; D013927:Thrombosis / Q000209:etiology*; D020246:Venous Thrombosis / Q000453:epidemiology / Q000209:etiology
chemical_list: D000925:Anticoagulants; D002809:Chondroitin Sulfates; D003871:Dermatan Sulfate; D004338:Drug Combinations; D006493:Heparin; D006497:Heparan Sulfate; C035838:danaparoid