title: Blood pressure measurement in the artery proximal and distal to an intra-arterial embolus during thrombolytic therapy.
abstract: OBJECTIVE
  When a cerebral embolism occurs, pressure gradients in the arteries between sites proximal and distal to the embolus exert hydromechanical forces that push the embolus distally, and potentially affect successful revascularization during clot removal. We investigated the relationships between blood pressures that occur immediately distal and proximal to the embolus, systemic blood pressure and clinical variables.
  
  
  METHODS
  36 patients with embolism of the internal carotid artery (13 patients) or the proximal middle cerebral artery (23 patients) were treated using intra-arterial thrombolysis. The mean blood pressure (MBP) at the sites proximal (proximal MBP) and distal (distal MBP) to the embolus was measured with a microcatheter. Simultaneously, the systemic MBP was recorded by cuff measurement.
  
  
  RESULTS
  Proximal, distal and systemic MBPs (mean±SD) were 95.2±13.2 mm Hg, 35.9±13.5 mm Hg and 98.2±12.2 mm Hg, respectively. The proximal MBP was significantly higher in the patients with systemic MBP≥100 mm Hg than those with systemic MBP<100 mm Hg (p<0.05). The distal MBP showed no difference between the high and normal systemic MBP groups.
  
  
  CONCLUSIONS
  Higher systemic blood pressure produced stronger hydromechanical forces on the clot, forming a proximal-distal blood pressure gradient across the clot. The stronger hydromechanical force could result in higher compaction of the clot, thus making it more difficult to remove.
authors: Department of Neurosurgery, Brain Research Institute, University of Niigata, Niigata, Japan. sorimachi@bri.niigata-u.ac.jp
authors: Takatoshi
authors: T
authors: Sorimachi
authors: Kenichi
authors: K
authors: Morita
authors: Yasushi
authors: Y
authors: Ito
authors: Yukihiko
authors: Y
authors: Fujii
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001794:Blood Pressure / Q000502:physiology*; D002341:Carotid Artery Thrombosis / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000503:physiopathology*; D002536:Cerebral Arteries / Q000000981:diagnostic imaging / Q000187:drug effects / Q000503:physiopathology; D004617:Embolism; D005260:Female; D006801:Humans; D020244:Infarction, Middle Cerebral Artery / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000503:physiopathology*; D020766:Intracranial Embolism / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D015912:Thrombolytic Therapy / Q000379:methods*; D016896:Treatment Outcome