title: Abnormal von Willebrand factor in bleeding angiodysplasias of the digestive tract.
abstract: OBJECTIVE
  Involvement of an abnormal von Willebrand factor in the bleeding expression of gastrointestinal angiodysplasias has been suggested but not assessed by prospective studies.
  
  
  METHODS
  To address this issue, 27 patients with either nonbleeding (group A, n = 9) or bleeding (group B, n = 9) digestive angiodysplasias or telangiectasias or diverticular hemorrhage (group C, n = 9) were enrolled. In all patients, an analysis of von Willebrand factor and a screening for the most common disorders associated with an acquired von Willebrand disease were performed.
  
  
  RESULTS
  In all patients from groups A and C, von Willebrand factor was normal, and no underlying disease could be found. In contrast, all but 1 patient from group B had a variable selective loss of the largest multimeric forms of von Willebrand factor, associated in 7 cases with a stenosis of the aortic valve.
  
  
  CONCLUSIONS
  This study indicates that most patients with bleeding angiodysplasia or telangiectasia have a deficiency of the largest multimers of von Willebrand factor induced by a latent acquired von Willebrand disease. Because these multimers are the most effective in promoting primary hemostasis at the very high shear conditions related to these vascular malformations, we suggest that their deficiency is likely to contribute to the bleeding diathesis.
authors.affiliation: Service d'Hématologie Biologique, Hôpital Antoine-Béclère, Clamart, France.
authors.forename: A
authors.initials: A
authors.lastname: Veyradier
authors.forename: A
authors.initials: A
authors.lastname: Balian
authors.forename: M
authors.initials: M
authors.lastname: Wolf
authors.forename: V
authors.initials: V
authors.lastname: Giraud
authors.forename: S
authors.initials: S
authors.lastname: Montembault
authors.forename: B
authors.initials: B
authors.lastname: Obert
authors.forename: I
authors.initials: I
authors.lastname: Dagher
authors.forename: J C
authors.initials: JC
authors.lastname: Chaput
authors.forename: D
authors.initials: D
authors.lastname: Meyer
authors.forename: S
authors.initials: S
authors.lastname: Naveau
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016888:Angiodysplasia / Q000175:diagnosis / Q000378:metabolism*; D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000378:metabolism; D016145:Endoscopy, Digestive System; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010265:Paraproteinemias / Q000175:diagnosis / Q000378:metabolism; D013684:Telangiectasis / Q000175:diagnosis / Q000378:metabolism; D014511:Uremia / Q000175:diagnosis / Q000378:metabolism; D014842:von Willebrand Diseases / Q000175:diagnosis / Q000378:metabolism*; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D014841:von Willebrand Factor