title: The New York Islands AVM Study: design, study progress, and initial results.
abstract: OBJECTIVE
  Prospective population-based data on the incidence of brain arteriovenous malformation (AVM) hemorrhage are scarce. We studied lifetime detection rates of brain AVM and incident AVM hemorrhage in a defined population.
  
  
  METHODS
  The New York islands (ie, Manhattan Island, Staten Island, and Long Island) comprise a 9,429,541 population according to the 2000 census. Since March 15, 2000, all major New York islands hospitals have prospectively reported data on consecutive patients living in the study area with a diagnosis of brain AVM and whether the patient had suffered AVM hemorrhage. Patients living outside the ZIP code-defined study area were excluded from the study population.
  
  
  RESULTS
  As of June 14, 2002, 284 prospective AVM patients (mean+/-SD age, 35+/-18 years; 49% women) were encountered during 21,216,467 person-years of observation, leading to an average annual AVM detection rate of 1.34 per 100,000 person-years (95% CI, 1.18 to 1.49). The incidence of first-ever AVM hemorrhage (n=108; mean age, 31+/-19 years; 45% women) was 0.51 per 100,000 person-years (95% CI, 0.41 to 0.61). The estimated prevalence of AVM hemorrhage among detected cases (n=144; mean age, 33+/-19 years; 50% women) was 0.68 per 100,000 (95% CI, 0.57 to 0.79).
  
  
  CONCLUSIONS
  Our prospective data, spanning 27 months, suggest stable rates for AVM detection and incident AVM hemorrhage. Approximately half of AVM patients may suffer intracranial hemorrhage.
authors.affiliation: Stroke Center, The Neurological Institute, Columbia University College of Physicians and Surgeons, 710 W 168th St, New York, NY 10032, USA. cstapf@neuro.columbia.edu
authors.forename: C
authors.initials: C
authors.lastname: Stapf
authors.forename: H
authors.initials: H
authors.lastname: Mast
authors.forename: R R
authors.initials: RR
authors.lastname: Sciacca
authors.forename: A
authors.initials: A
authors.lastname: Berenstein
authors.forename: P K
authors.initials: PK
authors.lastname: Nelson
authors.forename: Y P
authors.initials: YP
authors.lastname: Gobin
authors.forename: J
authors.initials: J
authors.lastname: Pile-Spellman
authors.forename: J P
authors.initials: JP
authors.lastname: Mohr
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002543:Cerebral Hemorrhage / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D015331:Cohort Studies; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D002538:Intracranial Arteriovenous Malformations / Q000150:complications* / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009519:New York City / Q000453:epidemiology; D011159:Population Surveillance; D015995:Prevalence; D011446:Prospective Studies; D012107:Research Design; D012189:Retrospective Studies