title: The influence of Helicobacter pylori status on circulating levels of the coagulation factors fibrinogen, von Willebrand factor, factor VII, and factor VIII.
abstract: BACKGROUND
  Helicobacter pylori (H. pylori) infection has been associated with an increased risk of developing ischemic heart disease (IHD). It has been suggested that a persisting low-grade acute phase response results from the chronic inflammation caused by H. pylori infection, which may give rise to increased circulating levels of certain coagulation factors.
  
  
  METHODS
  One hundred three (53 male) nonconsecutive, randomly selected white subjects with symptoms of dyspepsia were recruited for study from an outpatient endoscopy clinic at Leeds General Infirmary. The presence of H. pylori was determined by histological and microbiological investigation, a rapid urease test, and a 13carbon urea breath test (13C-UBT). Fibrinogen was measured by the Clauss method, factor VIII:C (FVIII:C) and factor VII:C (FVII:C) were measured by clotting rate assays, and the von Willebrand factor (vWF) was determined by an enzyme-linked immunosorbent assay.
  
  
  RESULTS
  No difference was found in levels of coagulation factors according to H. pylori status. Multiple regression models were used to account for the effect of covariates and H. pylori status on levels of FVII:C, FVIII:C, vWF, and fibrinogen, and again H. pylori status was not a significant determinant of levels of any of these coagulation factors. No difference occurred in full blood count, platelet count, white cell count, or plasma viscosity in individuals who were H. pylori-positive compared with those who were negative.
  
  
  CONCLUSIONS
  H. pylori infection is not associated with increased circulating levels of fibrinogen, FVII:C, vWF.Ag, or FVIII:C or hemorrheology in this patient group.
authors.affiliation: Diabetes and Thrombosis Research Group, University of Leeds, General Infirmary at Leeds, UK.
authors.forename: A M
authors.initials: AM
authors.lastname: Carter
authors.forename: P
authors.initials: P
authors.lastname: Moayyedi
authors.forename: A
authors.initials: A
authors.lastname: Catto
authors.forename: R M
authors.initials: RM
authors.lastname: Heppell
authors.forename: A T
authors.initials: AT
authors.lastname: Axon
authors.forename: P J
authors.initials: PJ
authors.lastname: Grant
mesh_terms: D000328:Adult; D001772:Blood Cell Count; D001809:Blood Viscosity; D005167:Factor VII / Q000032:analysis*; D005169:Factor VIII / Q000032:analysis*; D005260:Female; D005340:Fibrinogen / Q000032:analysis*; D016481:Helicobacter Infections / Q000097:blood* / Q000150:complications; D016480:Helicobacter pylori; D018056:Hemorheology; D006801:Humans; D002546:Ischemic Attack, Transient / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000453:epidemiology / Q000209:etiology*; D012307:Risk Factors; D012907:Smoking / Q000097:blood; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D014841:von Willebrand Factor; D005167:Factor VII; D005169:Factor VIII; D005340:Fibrinogen