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Updated: Sep 21, 2026
Assessing Therapeutic Angiogenesis in a Murine Model of Hindlimb Ischemia
Published on: June 8, 2019
Collateral circulation
1Department of Neurology, Comprehensive Stroke Center, University of Pennsylvania, Philadelphia 19104-4283, USA. davidliebeskind@yahoo.com
Insights
Understanding cerebral ischemia requires studying collateral circulation, the brain's natural bypass. Advanced neuroimaging can reveal critical details of these blood flow routes, aiding treatment and prognosis.
Area of Science:
- Neurology
- Vascular Biology
- Medical Imaging
Background:
- The collateral circulation is crucial in cerebral ischemia, but its evaluation is limited.
- Existing knowledge often overlooks secondary pathways like leptomeningeal vessels.
Purpose of the Study:
- To highlight the importance of collateral circulation in cerebral ischemia.
- To emphasize the need for advanced neuroimaging techniques for better evaluation.
Main Methods:
- Review of current understanding of collateral circulation in cerebral ischemia.
- Discussion of limitations in current evaluation methods.
- Exploration of advanced neuroimaging modalities (angiography and perfusion data).
Main Results:
- Anatomic descriptions often neglect secondary collateral pathways.
- Collateral vessel recruitment depends on complex hemodynamic, metabolic, and neural mechanisms.
- Advanced neuroimaging can characterize collateral status, guiding therapy and improving prognostication.
Conclusions:
- Refined neuroimaging correlating angiography and perfusion is key.
- This enhancement will improve understanding for therapeutic and prognostic applications.
Background:
The collateral circulation plays a pivotal role in the pathophysiology of cerebral ischemia. Current knowledge of the collateral circulation remains sparse, largely because of prior limitations in methods for evaluation of these diminutive routes of cerebral blood flow.
Summary Of Review:
Anatomic descriptions of the collateral circulation often focus on more proximal anastomoses at the circle of Willis, neglecting secondary collateral pathways provided by leptomeningeal vessels. Pathophysiological recruitment of collateral vessels likely depends on the temporal course of numerous compensatory hemodynamic, metabolic, and neural mechanisms. Subsequent endurance of these protective vascular pathways may determine the severity of ischemic injury. Characterization of the collateral circulation with advanced neuroimaging modalities that provide angiographic information and perfusion data may elucidate critical determinants of collateral blood flow. Such information on the status of the collateral circulation may be used to guide therapeutic interventions. Prognostication and risk stratification may also be improved by routine evaluation of collateral blood flow.
Conclusions:
Contemporary understanding of the collateral circulation may be greatly enhanced through further refinement of neuroimaging modalities that correlate angiographic findings with perfusion status, providing the basis for future therapeutic and prognostic applications.
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