title: The effect of combined factor XI deficiency with von Willebrand factor abnormalities on haemorrhagic diathesis.
abstract: To account for the lack of correlation between the level of factor XI (FXI) in deficient patients and haemorrhagic manifestations, we correlated the prevalence of combined FXI and von Willebrand's factor (vWF) deficiency in 212 FXI-deficient patients. Fifty-four patients had a combined FXI and vWF deficiency: 16 patients had severe and 38 patients had mild FXI deficiency. In a group of 28 patients with comparably mild FXI deficiency, 14 bleeders had significantly lower mean vWF, Ag, ristocetin cofactor and ristocetin induced platelet aggregation than 14 non-bleeders selected on the basis of comparable FXI levels. These findings suggest that the combination of FXI and vWF deficiency is common and may affect the bleeding tendency in mild FXI deficiency.
authors.affiliation: Hematology Institute, Rambam Medical Center, Haifa, Israel.
authors.forename: S
authors.initials: S
authors.lastname: Tavori
authors.forename: B
authors.initials: B
authors.lastname: Brenner
authors.forename: I
authors.initials: I
authors.lastname: Tatarsky
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000941:Antigens / Q000378:metabolism; D001789:Blood Group Antigens; D005169:Factor VIII / Q000378:metabolism; D005173:Factor XI Deficiency / Q000097:blood / Q000150:complications*; D006474:Hemorrhagic Disorders / Q000097:blood* / Q000209:etiology; D006801:Humans; D008875:Middle Aged; D014842:von Willebrand Diseases / Q000097:blood / Q000150:complications*; D014841:von Willebrand Factor / Q000276:immunology / Q000378:metabolism
chemical_list: D000941:Antigens; D001789:Blood Group Antigens; C029417:Von Willebrand antigen; D014841:von Willebrand Factor; D005169:Factor VIII