ischemic vs hemorrhagic stroke
/ iss-KEE-mik; hem-uh-RAJ-ik /
A stroke is what happens when part of the brain suddenly loses its blood supply, and brain tissue starved of blood begins to die within minutes. People often picture stroke as one thing, but there are two very different mechanisms, and telling them apart is the first fork in the road. In an ischemic stroke a vessel is blocked, like a pipe clogged by a clot, so the area downstream is cut off. In a hemorrhagic stroke a vessel bursts and blood leaks into or around the brain, like a pipe that has split and is flooding the surroundings.
Ischemic strokes are the common kind, roughly four out of five. The blockage may be a clot that formed on a furred-up artery wall, or a clot that travelled from elsewhere (often the heart) and lodged in a brain vessel. Which artery is blocked decides which functions are lost, because each vascular territory feeds a particular patch of brain — a blockage in the middle cerebral artery, the most commonly affected, typically weakens the opposite face and arm and may take out speech. Hemorrhagic strokes are fewer but tend to be more severe early on, because leaked blood not only deprives tissue but also presses on and irritates the surrounding brain, raising pressure inside the skull.
For rehabilitation the type matters less than what most people assume — once the patient is stable, therapy follows the pattern of lost function, not the underlying plumbing. But the type colours the early course: hemorrhagic survivors may look worse at first yet sometimes recover well as the pressure settles, while large ischemic strokes can have a more fixed deficit. The honest message is that rehabilitation does not undo the dead tissue or cure the vessel disease; it retrains the surviving brain and teaches new ways to live, while doctors separately work to prevent the next stroke.
Two patients arrive on the rehabilitation ward with a weak right arm and trouble speaking. One had an ischemic stroke from a clot in the left middle cerebral artery; the other had a bleed in nearly the same area. Their therapy plans look almost identical, because both are built around the same lost functions, even though the original injury was a blockage in one and a rupture in the other.
Stroke type drives the acute medical care; rehabilitation follows the pattern of lost function.
A widespread misconception is that the two types are treated the same in the emergency room — they are opposite: clot-busting drugs that help some ischemic strokes would be dangerous in a hemorrhage, which is why brain imaging comes first. That acute decision is medical care, not rehabilitation.