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Collateral Circulation- Evolving from Time Window to Tissue Window.

Archana Sharma1, Ayush Agarwal1, Venugopalan Y Vishnu1

  • 1Department of Neurology, All India Institute of Medical Sciences, New Delhi, India.

Annals of Indian Academy of Neurology
|April 10, 2023
PubMed
Summary
This summary is machine-generated.

Cerebral collateral circulation supports brain blood flow during blockages, improving stroke outcomes. Assessing collaterals aids patient selection for reperfusion therapies, potentially extending treatment windows.

Keywords:
Circulationcollateralfunctionalpenumbrastroke

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Area of Science:

  • Neurology
  • Vascular Biology
  • Medical Imaging

Background:

  • Cerebral collateral circulation provides alternative blood supply routes to the brain when major arteries are compromised by stenosis or occlusion.
  • Effective collateral pathways are crucial for maintaining blood flow to ischemic brain tissue during acute, subacute, and chronic phases of ischemic stroke or transient ischemic attack (TIA).
  • Good collateral status is associated with better functional outcomes and reduced stroke recurrence risk.

Purpose of the Study:

  • To highlight the significance of cerebral collateral circulation in stroke management.
  • To underscore the role of collateral scoring in patient selection for mechanical thrombectomy.
  • To explore the potential of collateral assessment in optimizing reperfusion therapies beyond fixed time windows.

Main Methods:

  • Review of existing literature on cerebral collateral circulation and its role in ischemic stroke.
  • Analysis of how collateral scoring methods were used in landmark mechanical thrombectomy trials.
  • Discussion of the implications of collateral status for patient selection and outcome prognostication.

Main Results:

  • Cerebral collateral circulation is vital for sustaining brain tissue viability during arterial compromise.
  • Collateral scoring systems have been instrumental in guiding patient selection for mechanical thrombectomy.
  • Favorable collateral status predicts better functional outcomes and lower stroke recurrence rates.

Conclusions:

  • Cerebral collateral circulation plays a critical role in mitigating ischemic brain damage and improving stroke outcomes.
  • Collateral assessment offers a promising approach to personalize reperfusion therapies, shifting focus from time windows to tissue viability.
  • Optimizing patient selection based on collateral status can enhance the efficacy of endovascular treatments for stroke.