title: [Cerebral infarction of arterial origin and haematological causation: the Lausanne experience and a review of the literature].
abstract: BACKGROUND
  Hematological diseases are seldom found as the etiology of ischemic strokes, but are frequently investigated by expensive laboratory tests after a first cerebral vascular event.
  
  
  METHODS
  In the Lausanne Stroke Registry, we retrospectively reviewed the cases of patients hospitalized between 1979 and 2001 for a first ischemic arterial stroke which was attributed to a hematological etiology. Of 4697 patients, 22 (0.47 per cent) had a stroke due to one of the following hematological pathology: polycythemia vera (4), secondary polycythemia (4), essential thrombocytemia (2), secondary thrombocytosis (4), multiple myeloma (1), CIVD (1), protein S deficiency (1), antiphospholipid antibody syndrome (4), moderate homocysteinemia (1). A literature review was undertaken for each hemopathy.
  
  
  CONCLUSIONS
  In light of the results of these data, we concluded that a complete blood count provides sufficient hematological screening for the majority of patients hospitalized for an arterial stroke. The antiphospholipid antibody syndrome is a rare cause of cerebral infarction, which needs to be investigated in young patients, in cases of multiple or recurring stroke or in the presence of a typical history. Inherited thrombophilias are not a significant risk factor for arterial cerebral infarction and their investigation is only warranted for a sub-group of young patients with a cryptogenic stroke, in which group the prevalence is slightly increased. Moderate homocysteinemia must be considered as a cerebrovascular risk factor of minor importance, but potentially treatable by a substitution of vitamin B12, B6 and folates. The efficacy of this substitution in the prevention of cardiovascular events needs yet to be demonstrated.
authors.affiliation: Service de Neurologie, CHUV, Lausanne, Suisse. ariane.gonthier@hospvd.ch
authors.forename: A
authors.initials: A
authors.lastname: Gonthier
authors.forename: J
authors.initials: J
authors.lastname: Bogousslavsky
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016736:Antiphospholipid Syndrome / Q000150:complications; D002544:Cerebral Infarction / Q000209:etiology*; D005260:Female; D006402:Hematologic Diseases / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013557:Switzerland; D019851:Thrombophilia / Q000150:complications