How does an ischemic stroke differ from a hemorrhagic stroke?

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The primary difference between an ischemic stroke and a hemorrhagic stroke lies in the underlying cause of the brain injury.

  • Ischemic Stroke: This type of stroke occurs when a blood vessel supplying the brain becomes blocked, typically by a blood clot (thrombus) or an embolism that travels from elsewhere in the body. This blockage starves brain tissue of blood and oxygen, leading to infarction, or the death of brain cells.12

  • Hemorrhagic Stroke: This type of stroke is caused by the rupture of a blood vessel in or on the surface of the brain, resulting in intracranial bleeding into the surrounding tissue. This rupture is often associated with hypertension or an aneurysm, which weakens the arterial wall.324

Distinguishing between these two is critical for medical treatment. For instance, anticoagulant drugs used to treat ischemic strokes are contraindicated for hemorrhagic strokes, as they could worsen the bleeding.2