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Significance of good collateral compensation in symptomatic intracranial atherosclerosis

Alexander Y L Lau1, Edward H C Wong, Adrian Wong

  • 1Division of Neurology, Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, SAR, China. alexlau@cuhk.edu.hk

Cerebrovascular Diseases (Basel, Switzerland)
|April 28, 2012
PubMed

Insights

Good collateral circulation is crucial for patients with symptomatic intracranial stenosis, improving outcomes and reducing stroke recurrence. A composite circulation score effectively predicts prognosis in these individuals.

Area of Science:

  • Neurology
  • Vascular Medicine
  • Radiology

Background:

  • Collateral circulation is vital for stabilizing cerebral blood flow during acute occlusions.
  • Its prognostic significance in intracranial atherosclerosis, particularly with moderate to severe stenosis, is less understood.
  • This study investigates the link between antegrade flow, collateral circulation, and patient outcomes in symptomatic intracranial stenosis.

Purpose of the Study:

  • To assess the association between antegrade flow across stenosis and collateral flow via leptomeningeal anastomosis.
  • To determine the impact of these flow dynamics on neurological outcomes and recurrence risk in patients with symptomatic intracranial stenosis.

Main Methods:

  • A retrospective analysis of 69 patients with symptomatic intracranial atherosclerosis (≥50% stenosis) was conducted.
  • Angiograms were evaluated for antegrade flow (Thrombolysis in Cerebral Infarction [TICI] grading) and collateral flow (American Society of Intervention and Therapeutic Neuroradiology/Society of Interventional Radiology [ASITN/SIR] grading).
  • A composite circulation score was developed, and logistic regression models identified predictors of good outcome (modified Rankin Scale [mRS] 0-2) and recurrence within 12 months.

Main Results:

  • Compromised antegrade flow (TICI 0-2a) was seen in 36% of patients and correlated with more severe stenosis.
  • A poor composite circulation score (indicating poor collateral compensation) was observed in 12% of patients.
  • A good circulation score (preserved flow) was associated with favorable outcomes (OR 7.50) and reduced recurrence risk (OR 0.18).

Conclusions:

  • Effective collateral compensation is more critical than antegrade or collateral grade alone in patients with symptomatic intracranial stenosis and compromised antegrade flow.
  • Good collateral flow is linked to better neurological outcomes and a lower risk of recurrent TIA or stroke.
  • Future studies should explore composite flow assessment for identifying high-risk intracranial stenosis with hemodynamic compromise.
Abstract

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