If you suspect that you or someone else is having a stroke, phone 999 immediately and ask for an ambulance.
Even if the symptoms of a stroke disappear while you are waiting for the ambulance to arrive, you or the person having the stroke should still go to hospital for an assessment. Symptoms that disappear may mean you have had a transient ischaemic attack (TIA) and you could be at risk of having a full stroke at a later stage.
After an initial assessment, you may need to be admitted to hospital to receive a more in-depth assessment and, if necessary, for specialist treatment to begin.
The signs and symptoms of a stroke vary from person to person but they usually begin suddenly. As different parts of your brain control different parts of your body, your symptoms will depend upon the part of your brain that has been affected and the extent of the damage.
The main stroke symptoms can be remembered with the word FAST: Face-Arms-Speech-Time.
It is important for everyone to be aware of these signs and symptoms. If you live with or care for somebody in a high-risk group, such as someone who is elderly or has diabetes or high blood pressure, being aware of the symptoms is even more important.
Symptoms in the FAST test identify about nine out of 10 strokes.
Other signs and symptoms may include:
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The symptoms of a transient ischaemic attack (TIA) are the same as for a stroke but only last from between a few minutes to a few hours, then completely disappear. However, never ignore a TIA as it is a serious warning sign that there is a problem with the blood supply to your brain.
There is about a one in 10 chance that those who have a TIA will experience a full stroke during the four weeks following the TIA. If you have had a TIA, you should contact your GP, local hospital or out-of-hours service, as soon as possible.
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Strokes are usually diagnosed by studying images of the brain (brain imaging). This can also be helpful in determining the risk of a transient ischaemic attack (TIA).
Even if the physical symptoms of a stroke are obvious, brain imaging should be carried out to determine:
Different treatment is required for each type of stroke so a rapid diagnosis will make treatment more straightforward.
Two common methods used for brain imaging are a computer tomography (CT) scan and a magnetic resonance imaging (MRI) scan.
A CT scan is like an X-ray but it uses multiple images to build up a more detailed, three-dimensional (3D) picture of your brain. An MRI scan uses a strong magnetic field and radio waves to produce a detailed picture of the inside of your body.
The type of scan you may have in hospital depends on the type of symptoms. In people with suspected major stroke, a CT scan is sufficient to identify whether the stroke is due to bleeding or clotting. It's quicker than an MRI scan and improves the chances of rapidly delivering treatments such as clot-busting (thrombolysis) that might be used in appropriate cases but which are time-limited and require the results of the scan before the treatment can be given safely.
For people with more complex symptoms, where the extent or location of the damage is unknown, and in patients who have recovered from a transient ischaemic attack, an MRI scan is more appropriate. This will provide greater detail of brain tissue, allowing smaller, or more unusually located strokes to be identified.
All patients with suspected stroke should receive a brain scan within 24 hours. Some patients should be scanned within the hour, especially those who:
After the injection of a dye into an arm vein, both CT and MRI can be used to take pictures of the blood vessels in the brain, as well as the blood vessels in the neck that take blood to the brain from the heart. This is known as a CT or MR angiogram and is often done immediately after taking picture of the brain itself.
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A swallow test is essential for anybody who has had a stroke.
Swallowing problems affect over a third of people after a stroke. When a person cannot swallow properly, there is a risk that food and drink may get into the windpipe and then into the lungs (called aspiration), which can lead to chest infections and pneumonia.
The test is simple. The person is given a few teaspoons of water to drink. If they can swallow this without choking and coughing they will be asked to swallow half a glass of water.
If they have any difficulty swallowing, they will be referred to the speech and language therapist for a more detailed assessment. They will usually be kept ‘nil by mouth’ until they have seen the therapist and may therefore need to have fluids or food given by an intravenous drip or nasogastric tube.
Further tests on the heart and blood vessels might be carried out later to confirm what caused the stroke. These may include:
An ultrasound scan uses high frequency sound waves to produce an image of the inside of your body. Your doctor may use a wand-like probe (transducer) to send high-frequency sound waves into your neck. These pass through the tissue creating images on a screen that will show if there is any narrowing or clotting in the arteries leading to your brain.
This type of ultrasound scan is sometimes known as a doppler scan or a duplex scan. Where carotid ultrasonography is needed, it should happen within 48 hours.
Dye is injected into your carotid or vertebral artery via a catheter. This gives a detailed view of your arteries than can be obtained using ultrasound, CT angiography or MR angiography.
In some cases an echocardiogram may be used to produce images of your heart using an ultrasound probe placed on your chest (transthoracic echocardiogram). In addition, transoesophageal echocardiography (TOE) may also be used. This involves an ultrasonic probe which is passed down the foodpipe (oesophagus), usually under sedation. Because it's directly behind the heart, it produces a clear image of blood clots and other abnormalities that may not get picked up by the transthoracic echocardiogram.
Your doctor may check for risk factors of stroke by taking blood tests, checking your pulse and blood pressure and using a stethoscope to listen to the sound of blood in the neck arteries.
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Glossary
The best way to prevent a stroke is to eat a healthy diet, exercise regularly and avoid smoking and excessive consumption of alcohol.
A poor diet is a major risk factor for a stroke. High-fat foods can lead to the build-up of fatty plaques in your arteries and being overweight can lead to high blood pressure.
A low-fat, high-fibre diet is recommended, including plenty of fresh fruit and vegetables (five portions a day) and whole grains. You should limit the amount of salt that you eat to no more than 6g (0.2oz) a day because too much salt will increase your blood pressure. Six grams of salt is about one teaspoonful.
There are two types of fat: saturated and unsaturated. You should avoid food containing saturated fats because these will increase your cholesterol levels.
Foods high in saturated fat include:
However, a balanced diet should include a small amount of unsaturated fat, which will help reduce your cholesterol levels.
Foods high in unsaturated fat include:
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Combining a healthy diet with regular exercise is the best way to maintain a healthy weight. Having a healthy weight reduces your chances of developing high blood pressure.
Regular exercise will make your heart and blood circulatory system more efficient. It will also lower your cholesterol level and keep your blood pressure at a healthy level.
The recommended level of cholesterol is 5mmol/litre (5 millimoles per litre of blood).
Blood pressure is measured using two figures. One figure represents the pressure of the heart as it contracts to pumps blood around the body. This is known as the systolic pressure. The second figure represents the pressure of the heart as it expands and fills with blood, while waiting for the next contraction. This is known as the diastolic pressure.
For most people, a healthy blood pressure is a systolic pressure of 90-120 millimeters of mercury (mmHg) and a diastolic pressure of 60-80mmHg. Or, as blood pressure is normally expressed, a level between 90/60mmHg and 120/80mmHg.
For most people, at least 150 minutes (2 hours and 30 minutes) of moderate-intensity aerobic activity (i.e. cycling or fast walking) every week is recommended.
If you are recovering from a stroke, you should discuss possible exercise plans with the members of your rehabilitation team. Regular exercise may be impossible in the first weeks or months following a stroke but you should be able to begin exercising once your rehabilitation has progressed.
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Smoking doubles your risk of having a stroke. This is because it narrows your arteries and makes your blood more likely to clot.
If you stop smoking, you can reduce your risk of having a stroke by up to half. Not smoking will also improve your general health and reduce your risk of developing other serious conditions, such as lung cancer and heart disease.
The NHS Smoking Helpline can offer advice and encouragement to help you quit smoking. You can call on 0800 022 4332, or visit NHS Smokefree.
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Excessive alcohol consumption can lead to high blood pressure and an irregular heartbeat (atrial fibrillation). Both are major risk factors for stroke.
Because alcoholic drinks are rich in energy (high in calories) they also cause weight gain. Heavy drinking multiplies the risk of stroke by more than three times.
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Glossary