Stroke
A medical emergency caused by interrupted blood flow to the brain.
A stroke is a medical condition in which blood flow to a part of the brain is reduced or blocked, causing cell death. There are two main types: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. Both cause parts of the brain to stop functioning properly. Strokes are a leading cause of death and long-term disability worldwide.
- type
- Medical condition
- main_types
- Ischemic and hemorrhagic
- global_incidence_2023
- 15 million people worldwide had a stroke
- global_deaths_2021
- Third biggest cause of death, responsible for approximately 10% of total deaths
- risk_factor
- High blood pressure is the biggest risk factor
- common_symptoms
- Facial drooping, inability to walk, move or feel on one side, problems understanding or speaking, dizziness, loss of vision to one side
Lore & Background
A stroke occurs when blood supply to part of the brain is reduced or blocked, leading to cell death. Ischemic strokes, accounting for about 87% of cases, are caused by thrombosis, embolism, systemic hypoperfusion, or cerebral venous sinus thrombosis. Hemorrhagic strokes result from bleeding within the brain or into the space between the brain's membranes, often due to a ruptured aneurysm. Symptoms include facial drooping, arm weakness, speech difficulty, and sudden severe headache in hemorrhagic cases. Diagnosis relies on physical exam and imaging like CT or MRI scans, with CT ruling out bleeding but not necessarily early ischemia.
Reader's Guide
Incidence has decreased in developed regions but increased in developing areas. Prevention focuses on managing risk factors such as high blood pressure, smoking, and atrial fibrillation. Ischemic strokes may be treated with clot-dissolving medication if detected within three to four-and-a-half hours, while hemorrhagic strokes sometimes require surgery. Stroke rehabilitation in specialized units aids recovery, though such units are not widely available. The condition's urgency has led to alternative terms like 'brain attack' to emphasize rapid treatment.
Did You Know?
- A transient ischemic attack (TIA), or mini-stroke, has symptoms that resolve within 24 hours.
- About 87% of strokes are ischemic, with the rest being hemorrhagic.
- Low blood sugar can cause symptoms similar to a stroke.
- Users of stimulants such as cocaine and methamphetamine are at high risk for an ischemic stroke.
Frequently Asked Questions
What is Stroke?
Stroke is a medical emergency that occurs when blood supply to a region of the brain is cut off or severely reduced, leading to the death of brain cells in that area. This causes the affected brain region to lose its normal function.
What are the two main types of Stroke?
The two primary forms are ischemic stroke, which happens when a blockage prevents blood from reaching brain tissue, and hemorrhagic stroke, which occurs when a blood vessel ruptures and bleeds into the brain. Both types ultimately cause brain cells to die and stop working properly.
What symptoms should someone watch for with Stroke?
Common warning signs include one-sided facial drooping, loss of movement or sensation on one side of the body, difficulty speaking or understanding speech, dizziness, and vision loss on one side. These symptoms signal that brain function is being compromised and require immediate medical attention.
What is the biggest risk factor for Stroke?
High blood pressure is the single most significant risk factor for developing a stroke. Keeping blood pressure within a healthy range is one of the most effective ways to lower the chance of experiencing one.
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