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Collateral Capacity

Similar to CVR, collateral flow reflects an alternative compensatory mechanism to pathological flow conditions. The cerebral collateral pathways include side-to-side via the anterior communicating artery, posterior-to anterior via the posterior communicating artery, and external-to-internal via the ophthalmic artery.

TCD will detect reverse velocities in the collaterally perfused arteries, indicating the viability or absence of this compensatory mechanism.


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