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Related Experiment Videos

The Carotid Occlusion Surgery Study.

Robert L Grubb1, William J Powers, Colin P Derdeyn

  • 1Department of Neurological Surgery, Washington University School of Medicine, Washington University Medical Center, St. Louis, Missouri 63110-1093, USA. GrubbR@nsurg.wustl.edu

Neurosurgical Focus
|February 16, 2005
PubMed
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Increased oxygen extraction fraction (OEF) in carotid artery occlusion patients predicts stroke risk. A new study will test if superficial temporal artery-middle cerebral artery anastomosis surgery reduces stroke compared to medical therapy.

Area of Science:

  • Neurology
  • Neurosurgery
  • Radiology

Background:

  • Symptomatic complete carotid artery (CA) occlusion poses a significant stroke risk.
  • Increased oxygen extraction fraction (OEF), a marker of hemodynamic failure, is a potent predictor of future stroke in these patients.
  • Previous studies suggest superficial temporal artery (STA) to middle cerebral artery (MCA) anastomosis can normalize OEF.

Purpose of the Study:

  • To test the hypothesis that STA-MCA anastomosis combined with medical therapy reduces ipsilateral ischemic stroke by 40% at 2 years.
  • To evaluate the efficacy of surgical intervention in patients with symptomatic internal CA occlusion and Stage II hemodynamic failure.
  • To compare stroke rates between patients randomized to surgery versus best medical therapy.

Main Methods:

Related Experiment Videos

  • Randomized controlled trial enrolling patients with symptomatic internal CA occlusion and increased OEF.
  • Patients will be randomized to either STA-MCA anastomosis plus medical therapy or medical therapy alone.
  • Primary endpoint includes all strokes and death from randomization to 30-day postoperative (or equivalent non-surgical period), and ipsilateral ischemic stroke within 2 years.

Main Results:

  • The St. Louis Carotid Occlusion Study found significantly higher 2-year ipsilateral stroke rates in patients with increased OEF (26.5%) versus normal OEF (5.3%).
  • In patients with recent hemispheric symptoms, 2-year stroke rates were 50% in those with increased OEF versus 12% with normal OEF.
  • This data supports the need for interventions in high-risk patients identified by OEF.

Conclusions:

  • Increased OEF in symptomatic carotid artery occlusion is a strong indicator of hemodynamic failure and elevated stroke risk.
  • STA-MCA anastomosis is a potential therapeutic strategy to improve cerebral hemodynamics and reduce stroke incidence.
  • A large randomized trial is warranted to confirm the benefit of STA-MCA anastomosis in preventing stroke in this high-risk population.