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Stroke occurs when blood flow to a part of the brain is suddenly disrupted or severely reduced, due to a blockage or rupturing of blood vessels.
This results in the death of brain cells, and may cause permanent injury or disability, depending on the part of the brain affected.
There are 2 common types of strokes:
Some people may also experience stroke-like symptoms in a transient ischaemic attack. This happens when blood supply to the brain is temporarily interrupted due to a transient (temporary) blood clot.
Also known as a ‘mini-stroke’, its symptoms occur quickly and lasts for a relatively short time (from minutes to less than 24 hours). People who experience this should consider this as a serious warning sign and seek immediate medical assistance to understand their risk factors and potentially prevent a stroke.
Stroke is often thought of as a disease that affects the elderly. However, it can happen to anyone at any age. In Singapore, stroke was the fourth leading cause of deaths, and accounted for 6% of all deaths, in 2020.
Symptoms of stroke commonly include the following:
If you experience any of the above warning signs, it is important to seek medical attention quickly. Immediate medical treatment (within 4.5 hours from the start of the stroke) can greatly reduce any potential disability.
The causes of stroke depend on its type:
These occur when there is a build-up of cholesterol deposits, known as plaques, in the walls of a blood vessel in the brain. These plaques can lead to clot formation, resulting in the narrowing or blockage of blood vessels, causing reduced/absent blood supply to the brain.
These occur when the blood vessel in the brain leaks or bursts due to medical conditions such as high blood pressure or a brain aneurysm (an abnormal balloon-like swelling in the wall of blood vessel inside the brain).
People with the following conditions are at higher risk of suffering from stroke:
Other risk factors include:
A stroke may result in a temporary or permanent disability, depending on the area of the brain affected.
Complications associated with stroke include:
Primary prevention for stroke is targeted at people who possess risk factors for stroke but have not experienced one. It involves lifestyle changes or medications to manage and control conditions such as hypertension and diabetes mellitus.
People with hypertension (high blood pressure) may be prescribed medications like antihypertensive drugs to reduce their high blood pressure. Studies show that even small reductions in blood pressure in elderly patients can effectively reduce their risk of stroke by 30 – 40%.
Patients with heart conditions like atrial fibrillation (irregular heartbeat) may be prescribed anticoagulants (blood thinners) to manage the condition and reduce the risk of getting stroke.
Secondary prevention for stroke focusses on reducing the chance of a stroke reoccurring in patients who have experienced a stroke or transient ischaemic attack.
The main measures include antiplatelet or anticoagulant therapy, which involves the prescription of medicines to remove or reduce the risk of blood clotting in the blood vessels.
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