title: Flow dynamics of lateral carotid artery aneurysms and their effects on coils and balloons: an experimental study in dogs.
abstract: OBJECTIVE
  To investigate the hemodynamic characteristics of lateral carotid artery aneurysms in a canine model and to determine their influence on coils and balloons.
  
  
  METHODS
  Forty aneurysms were created in fourteen dogs and their hemodynamic characteristics and influence on coils and balloons were evaluated with angiography and color Doppler pre- and postplacement. Twenty aneurysms were treated with coils, eight with balloons, and 12 aneurysms served as controls.
  
  
  RESULTS
  The aneurysms demonstrated three distinct zones of flow: 1) an inflow zone entering at the distal aspect of the aneurysm ostium, 2) an outflow zone exiting at the proximal ostium, and 3) a central slow flow vortex. The inflow zone is a determining factor in the placement and stability of coils and balloons placed within the aneurysm and in the thrombosis of an aneurysm. The force of the inflow is considerable and can alter the shape of coils and displace both coils and balloons positioned within the aneurysm.
  
  
  CONCLUSIONS
  Coils and balloons need to be of shapes and sizes that do not conform to the inflow and outflow zones. Filling the aneurysm and blocking or displacing the inflow zone can produce thrombosis of an aneurysm with preservation of the parent artery.
authors.affiliation: Department of Radiology, University of Wisconsin, Madison 53792.
authors.forename: V B
authors.initials: VB
authors.lastname: Graves
authors.forename: C M
authors.initials: CM
authors.lastname: Strother
authors.forename: C R
authors.initials: CR
authors.lastname: Partington
authors.forename: A
authors.initials: A
authors.lastname: Rappe
mesh_terms: D000800:Angioplasty, Balloon; D000818:Animals; D001783:Blood Flow Velocity / Q000502:physiology; D002340:Carotid Artery Diseases / Q000503:physiopathology* / Q000628:therapy; D004285:Dogs; D002532:Intracranial Aneurysm / Q000503:physiopathology* / Q000628:therapy; D010984:Platinum; D015607:Stents
chemical_list: D010984:Platinum