title: Pathophysiologic assessment of stagnating arteries after removal of arteriovenous malformations.
abstract: OBJECTIVE
  To assess the hemodynamics and pathophysiology of stagnating arteries after removal of arteriovenous malformations (AVMs).
  
  
  METHODS
  50 patients with supratentorial pial AVMs underwent pre- and postoperative angiographic studies.
  
  
  RESULTS
  The following characteristics were found to correlate with stagnating arteries: 1) advanced patient age, 2) large AVM size, 3) markedly dilated feeders, 4) early postoperative angiograms, and 5) delayed restoration of feeding artery diameter.
  
  
  CONCLUSIONS
  The rate of blood flow in the former feeding arteries, expressed as v x pi x r2 (v = mean velocity, r = vessel radius), suddenly decreases after removal of AVMs. When dilatation persists postoperatively in these arteries the flow velocity decreases and stagnation takes place. Delayed postoperative restoration of feeding artery diameter may be caused by a decrease of elasticity due to long-standing hemodynamic stresses, and by increased postoperative vascular resistance of these arteries.
authors.affiliation: Department of Neurosurgery, Kitasato University School of Medicine, Kanagawa, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Miyasaka
authors.forename: K
authors.initials: K
authors.lastname: Yada
authors.forename: T
authors.initials: T
authors.lastname: Ohwada
authors.forename: T
authors.initials: T
authors.lastname: Kitahara
authors.forename: A
authors.initials: A
authors.lastname: Kurata
authors.forename: K
authors.initials: K
authors.lastname: Irikura
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002533:Cerebral Angiography; D002560:Cerebrovascular Circulation; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D008875:Middle Aged; D013997:Time Factors