Galen Medical Surgical Exam 2 Practice 2026 - Free Medical Surgical Practice Questions and Study Guide

The defining split in stroke is whether brain injury stems from blocked blood flow or from bleeding. An ischemic stroke happens when a cerebral artery is occluded, cutting off blood supply to a brain region and causing tissue ischemia. A hemorrhagic stroke occurs when a blood vessel ruptures, leading to bleeding into brain tissue or surrounding spaces and causing pressure and toxicity from the blood.

This dichotomy is the standard way to categorize stroke because it has immediate implications for treatment and prognosis. The other options describe specific mechanisms within ischemic strokes (embolism vs thrombosis) or factors like duration or broad categories that don’t define the two classic stroke types. Recognizing ischemic versus hemorrhagic first guides the urgent imaging needed and the appropriate interventions, such as clot-dissolving therapy or precautions to control bleeding.