How brain damage occurs during a stroke and why the first few hours matter

UPDATE - follow-up to What happens inside the brain during a stroke?: Brain cells begin to suffer permanent damage within three to five minutes of interrupted blood flow during a stroke, with 1.9 million neurons dying every single minute. A stroke happens when blood flow to the brain stops or when a blood vessel bursts, cutting off vital supplies of oxygen and glucose.

Types and Damage

Strokes are split into ischemic and haemorrhagic types. Ischemic strokes happen when a blood clot blocks an artery, starving brain cells of oxygen and causing toxic substances to build up. Haemorrhagic strokes occur when a blood vessel ruptures and leaks blood into the brain tissue, which interferes with proper blood and fluid flow. While the central core area suffers fast and irreversible harm, the surrounding zone known as the ischemic penumbra contains cells that can survive if blood flow is restored quickly.

Symptoms and Effects

Depending on which part of the brain is hurt, a stroke can impair movement, speech, vision, memory, and coordination. Some strokes do not show the usual facial drooping or arm weakness, but other signs include sudden vision changes, lack of balance, confusion, or a severe headache. The BE FAST method helps people identify these signs, and even symptoms that disappear within a minute or two still need an immediate medical check.

Context

Medical teams use various treatments depending on the case, such as giving clot-dissolving drugs within four and a half hours for some ischemic strokes, or performing a mechanical thrombectomy up to 24 hours later. Recovery paths differ for every patient, and doctors continue monitoring patients and offering therapies like physiotherapy and speech therapy once their condition stabilises.