Ischemic stroke is caused by which mechanism?

Ischemic stroke is caused by which mechanism?

• A. Blockage of an artery leading to brain ischemia
• B. Rupture of a blood vessel causing bleeding
• C. Infection of brain tissue
• D. Degeneration of neurons due to age

Answer: (A)

Ischemic stroke happens when a blood vessel in the brain is blocked, cutting off blood flow and depriving brain tissue of oxygen and glucose. A clot can form directly in a brain artery or travel from elsewhere and lodge in a vessel, stopping perfusion to a region. Without this blood supply, brain cells quickly lose energy and begin to die, causing the sudden neurological deficits typical of an ischemic event. This mechanism is distinct from a hemorrhagic stroke, where bleeding into the brain from a ruptured vessel causes damage. The other options describe infection or age-related degeneration, which are not about blocked blood flow to brain tissue.

Ischemic stroke happens when a blood vessel in the brain is blocked, cutting off blood flow and depriving brain tissue of oxygen and glucose. A clot can form directly in a brain artery or travel from elsewhere and lodge in a vessel, stopping perfusion to a region. Without this blood supply, brain cells quickly lose energy and begin to die, causing the sudden neurological deficits typical of an ischemic event. This mechanism is distinct from a hemorrhagic stroke, where bleeding into the brain from a ruptured vessel causes damage. The other options describe infection or age-related degeneration, which are not about blocked blood flow to brain tissue.