Once a stroke happens, neurons-brain cells in charge of transmitting signals to the body-start dying. What Happens in the Seconds and Minutes After a Stroke The less common type of stroke is called hemorrhagic, when a weakened blood vessel ruptures, causing blood to spill into the brain, also damaging cells. Most strokes- more than 85 percent-are ischemic, meaning brain cells are damaged by a lack of oxygen supply caused by a blockage in the arteries. When those arteries become blocked and cannot deliver oxygen, brain cells immediately start to die. It usually happens because a blood clot dislodges from elsewhere in the body and becomes stuck in the arteries that supply the brain with fresh, oxygenated blood. What Happens During a Stroke: The Brain AttackĪ stroke occurs when blood flow to the brain is suddenly interrupted. Read on to learn what happens in the seconds, minutes, hours and days after a stroke. But fast treatment can-and does-save lives and brain tissue. Stroke is a leading cause of adult disability and the fifth-leading cause of death in the United States. This ability to cause quick devastation is why strokes must be treated with as much speed as possible. “It happens extremely quickly and leaves a big effect,” says Omar Kass-Hout, MD, medical director of stroke and interventional neurology at UNC Rex Healthcare. ![]() Think of a stroke like a lightning strike.
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