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The ischemic penumbra can maintain metabolic demand with marginal blood flow from collateral circulation for a maximum of _____ before increasing in size.

User Jacklyn
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The ischemic penumbra can maintain metabolic demand with marginal blood flow from collateral circulation for a maximum of 50% before increasing in size. A penumbra is the area where the flow of blood at about 25 - 50% can maintain normal metabolic demands for 6 - 8 hours only. When it continues to increase, the human cells will die and other neurological activity will be suspended causing the person to die slowly.
User Ekaterina Prigara
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