An in-depth report on the causes, diagnosis, treatment, and prevention of stroke.
An in-depth report on the causes, diagnosis, treatment, and prevention of stroke.
The American Stroke Association advises everyone to learn to recognize these signs of stroke:
The acronym F.A.S.T. is an easy way to remember signs of stroke and what to do if you think a stroke has occurred. (The most important is to immediately call 9-1-1 for emergency assistance.) F.A.S.T. stands for:
It is critical for people with stroke symptoms to get to a hospital as quickly as possible. People who are suffering an ischemic stroke may be able to receive a clot-busting drug called tissue plasminogen activator (tPA) to dissolve the clot if they reach a hospital within 3 to 4.5 hours of symptom onset. Ideally, people should receive the clot-busting drug within 60 minutes of arriving at the hospital. But this treatment window can be extended to 4.5 hours for people who:
Recently, so called 'stent retrievers' have been introduced in patients with acute embolic stroke. These devices can be threaded into the blocked artery for removal of the clot or thrombus in a procedure called mechanical thrombectomy. This treatment also works better the earlier it is provided.
In 2014, the American Heart Association and the American Stroke Association released the first guidelines to specifically address stroke prevention in women. Some of the unique risks that doctors need to consider in women include:
A stroke is the sudden death of brain cells due to lack of oxygen. A stroke is usually defined as one of 2 types:
The consequences of a stroke, the type of functions affected, and the severity depend on where in the brain it has occurred and the extent of the damage.
Blood Flow Blockage
Strokes are caused by either blood flow blockage to the brain (ischemic stroke) or the sudden rupture of an artery in the brain (hemorrhagic stroke). Sometimes an ischemic stroke can become a hemorrhagic stroke when bleeding follows the acute blockage. Brain cells require a constant supply of oxygen to stay healthy and function properly. Therefore, blood is supplied continuously to the brain through two main arterial systems:
The Circle of Willis is the joining area of several arteries at the bottom (inferior) side of the brain. At the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the brain.
Blockage of blood flow to the brain for even a short period of time can be disastrous and cause brain damage or even death.
Ischemic strokes are by far the more common type of stroke, causing nearly 90% of all strokes. Ischemia means the deficiency of oxygen in vital tissues. Ischemic strokes are caused by blood clots that are usually one of four types.
Thromboembolic Stroke and Atherosclerosis
An embolic stroke is caused by a dislodged blood clot that has traveled through the blood vessels (an embolus) until it becomes wedged in an artery. The vast majority of ischemic strokes are caused by this mechanism. These types of ischemic stroke usually occur when an artery that carries blood to the brain is blocked by a thrombus (blood clot) that forms as the result of atherosclerosis (commonly known as hardening of the arteries). These strokes are also sometimes referred to as large-artery strokes. The process leading to thrombotic stroke is complex and occurs over time:
In addition, other events contribute to the coming stroke:
Cardioembolic Strokes and Atrial Fibrillation
Cardioembolic strokes start with clots in the heart and may be due to various conditions:
Thrombotic strokes occur when a clot develops in a diseased artery right in the brain. Thrombotic strokes cause about 1 in 5 ischemic strokes. Thrombotic strokes tend to occur at night, and their symptoms may develop more slowly than those of an embolic stroke, which is usually swift and sudden.
Small Vessel (Lacunar) Strokes
Lacunar infarcts are very tiny ischemic strokes, which may cause clumsiness, weakness, and emotional variability. They make up the majority of silent brain infarctions and may result from chronic high blood pressure. They are actually a subtype of thrombotic stroke. They can also sometimes serve as warning signs for a major stroke.
Many older people have had silent brain (cerebral) infarctions, small strokes that cause no apparent symptoms. They are detected in up to half of the older people who undergo imaging tests for problems other than stroke. The presence of silent infarctions indicates an increased risk for future stroke, as well as dementia. Smokers and people with hypertension are at particular risk.
Stroke due to Arterial Dissection
If one of the arteries develops a tear in the lining, blood can squeeze between the layers of the artery wall, known as a dissection. As the blood expands, it closes off the lumen of the artery and prevents blood flow to parts of the brain. Dissection often occurs due to trauma to the artery but may occur in people with conditions that affect the connective tissue in the arteries.
Certain conditions can cause the blood to clot more than usual and can result in a stroke. These conditions can be hereditary or develop as a consequence of another medical problem such as cancer or autoimmune disease.
Cerebral vasculitis results in strokes when inflammation of the blood vessel blocks blood flow. This can occur in autoimmune diseases such as lupus, or result from a reaction to medication or street drugs.
Infection in the body can spread to the heart valves. Infective particles, most commonly bacterial, break off the valve and lodge in a blood vessel in the brain. This condition often causes multiple strokes. Autoimmune disease can also cause endocarditis.
A transient ischemic attack (TIA) is an episode in which a person has stroke-like symptoms that typically last for a few minutes and usually less than 1 to 2 hours. Transient ischemic attacks (TIAs) are caused by tiny emboli (clots often formed of pieces of calcium and fatty plaque) that lodge in an artery to the brain. They typically break up quickly and dissolve. But they do temporarily block the supply of blood to the brain.
TIAs do not cause lasting damage. But they are a warning sign that a true stroke may happen in the future if something is not done to prevent it. TIA should be taken very seriously and treated as aggressively as a stroke. About 10% to 15% of people who have a TIA have a stroke within 3 months, with half of these strokes occurring within 48 hours after the TIA.
About 10% of strokes occur from hemorrhage (sudden bleeding) into or around the brain. While hemorrhagic strokes are less common than ischemic strokes, they tend to be more deadly.
Hemorrhagic strokes are categorized by how and where they occur.
On average, every 40 seconds, someone in the United States has a stroke. While age is the major risk factor, people who have a stroke are likely to have more than one risk factor.
Doctors can calculate an individual person's risk of having a stroke or heart attack within the next 10 years. The American College of Cardiology (ACC) and the American Heart Association (AHA) have a special "risk calculator" that factors into its equation a person's race, sex, age, total cholesterol, HDL ("good") cholesterol, blood pressure, use of blood pressure medications, diabetes status, and smoking history. These are the critical risk factors for both stroke and heart attack.
The ACC/AHA recommend using this risk equation to calculate 10-year risk in people, ages 40 to 79 years old. A separate calculation is used to estimate lifetime risk for heart attack or stroke in people starting at age 20 years.
People most at risk for stroke are older adults, particularly those who have high blood pressure, are sedentary, are overweight, smoke, or have diabetes. Older age is also linked with higher rates of post-stroke dementia. However, younger people are not immune. Many stroke victims are under age 65.
In most age groups, except older adults, stroke is more common in men than in women. However, stroke kills and disables more women than men. This may be partly due to the fact that women tend to live longer than men, and stroke is more common among older adults.
Younger women have specific risk factors that place them at greater risk for stroke than men. These risks include migraine with aura, use of oral contraceptives, and pregnancy-related high blood pressure. Hypertension during pregnancy can develop into a dangerous condition called preeclampsia that increases stroke risk. Smoking amplifies these risks, as does the presence of high cholesterol or obesity.
Some US populations, including African Americans, American Indians, Alaska Natives, and Hispanics, have a higher risk of stroke than non-Hispanic Whites. African Americans have a significantly higher risk of death from stroke and double the risk of a first stroke compared with non-Hispanic Whites. Younger African Americans are two to three times more likely to have a stroke than similar age white people and four times more likely to die from one.
The racial disparities in stroke incidence may be partly explained by the higher prevalence of obesity, diabetes, and high blood pressure in these groups. However, studies suggest that socioeconomic factors also affect these differences.
A family history of stroke or TIA is a strong risk factor for stroke.
People who smoke a pack of cigarettes a day have more than twice the risk for stroke as nonsmokers. Smoking increases both hemorrhagic and ischemic stroke risk. The risk for stroke may remain elevated for as long as 14 years after quitting, so the earlier one quits the better.
Unhealthy diet (saturated fat, high sodium) can contribute to heart disease, high blood pressure, and obesity, which are all risk factors for stroke. A heart-healthy diet can reduce the risk for stroke.
Lack of regular exercise can increase the risk of obesity, diabetes, and poor circulation, which increases the risk of stroke.
Alcohol and Drug Abuse
Alcohol abuse, including binge drinking, increases the risk of stroke. Drug abuse, particularly with cocaine or methamphetamine, is a major risk factor for stroke in young adults. Anabolic steroids, used for body-building and sports enhancement, also increase stroke risk.
Heart disease and stroke are closely tied for many reasons. People who have one heart or vascular condition (such as high blood pressure, high cholesterol, heart disease, diabetes, or peripheral artery disease) are at increased risk for developing other related conditions.
A history of a prior stroke or TIA significantly increases the risk for a subsequent stroke. People who have had at least one TIA are 10 times more likely to have a stroke than those who have not had a TIA.
Prior Heart Attack
People who have had a heart attack are at increased risk of stroke.
High Blood Pressure
High blood pressure (hypertension) contributes to about 70% of all strokes. People with hypertension have up to 10 times the normal risk of stroke, depending on the severity of the blood pressure and the presence of other risk factors. Women with hypertension are at greater risk than men for having a first stroke.
Hypertension is also an important cause of so-called silent cerebral infarcts (mini-strokes caused by blockages in the blood vessels in the brain), which may predict major stroke. Controlling blood pressure is extremely important for stroke prevention. Normal blood pressure is below 120/80 mmHg. Blood pressure is considered elevated between 120/80 and 129/80 mmHg and high at 130/80 mmHg or above.
Unhealthy Cholesterol Levels
A high total cholesterol level increases the risk of developing atherosclerosis ("hardening of the arteries") and heart disease. In atherosclerosis, fatty deposits (plaques) of cholesterol build up in the arteries of the heart.
Coronary artery disease (heart disease), the end result of atherosclerosis, increases stroke risk. Anti-clotting medications, which are used in heart disease treatment to break up blood clots, can increase the risk of hemorrhagic stroke.
Atrial fibrillation, a major risk factor for stroke, is a heart rhythm disorder in which the atria (the upper chambers in the heart) do not beat in a coordinated fashion, which often makes the overall heart rate fast and irregular. The blood stagnates instead of being pumped out promptly, increasing the risk for formation of blood clots that break loose and travel toward the brain or other parts of the body.
The stroke risk for people with atrial fibrillation is generally highest for those older than age 75, with heart failure or enlarged heart, coronary artery disease or other atherosclerotic vascular diseases, history of blood clots, diabetes, hypertension, women, or those with heart valve abnormalities.
Structural Heart Problems
Dilated cardiomyopathy (enlarged heart), heart valve disorders, and congenital heart defects, such as patent foramen ovale (opening between the upper chambers of heart, called atria) and atrial septal aneurysm (bulging of wall between the atria), are risk factors for stroke.
Carotid Artery Disease and Peripheral Artery Disease
Carotid artery disease is a serious risk factor for stroke. Atherosclerosis can cause fatty build-up in the carotid arteries of the neck, which can lead to blood clots that block blood flow and oxygen to the brain. People with peripheral artery disease, which occurs when atherosclerosis narrows blood vessels in the legs and arms, are at increased risk of carotid artery disease and subsequently stroke.
Hypertension is a disorder characterized by chronically high blood pressure. It must be monitored, treated, and controlled by medication, lifestyle changes, or a combination of both.
Heart disease and stroke are the leading causes of death in people with diabetes. Diabetes is second only to high blood pressure as the main risk factor for ischemic stroke. The risk is highest for adults newly diagnosed with type 2 diabetes and patients with diabetes who are younger than age 55. African-Americans with diabetes are at an even higher risk for stroke at a younger age. Diabetes is strongly associated with other stroke risk factors such as obesity and high blood pressure. Diabetes does not appear to increase the risk for hemorrhagic stroke.
Obesity is associated with stroke risk factors such as diabetes, high blood pressure, and unhealthy cholesterol levels. Obesity may also increase the risk for both ischemic and hemorrhagic stroke independently of these other risk factors. Weight that is centered around the abdomen (the so-called apple shape) has a particularly high association with stroke, as it does for heart disease, in comparison to weight distributed around hips (pear-shape).
Obesity is particularly hazardous when it is one of the components of metabolic syndrome. This syndrome is diagnosed when at least three of the following conditions are present: abdominal obesity, low HDL cholesterol, high triglyceride levels, high blood pressure, and insulin resistance. Because metabolic syndrome is a pre-diabetic condition that is significantly associated with heart disease, people with this syndrome are at increased risk for stroke even before diabetes develops. Lifestyle modifications (diet, exercise, weight loss) can help reduce the risk for stroke in people diagnosed with metabolic syndrome.
Studies suggest that migraine headache is a risk factor for stroke in both men and women, especially before age 50. The risk is higher for migraine accompanied by aura, which occur more frequently in women. Women who have migraine with aura and also smoke, or use oral contraceptives, have even greater risks for ischemic or hemorrhagic stroke.
Birth control pills, which contain estrogen, can increase stroke risk, especially for women who are older, have high blood pressure, or who smoke. The American Heart Association recommends that doctors screen patients for high blood pressure before prescribing oral contraceptives.
For most women, pregnancy carries a very small risk for stroke. However, women who have high blood pressure (hypertension) during pregnancy have an increased risk for stroke. Hypertension during pregnancy can lead to preeclampsia, a dangerous condition marked by high blood pressure and increased protein in the urine. Preeclampsia is a risk factor for future hypertension and stroke, as is gestational diabetes (insulin resistance that occurs during late pregnancy). The post-partum period has the greatest risk for stroke.
The American Heart Association recommends that women who have high blood pressure during pregnancy or are at risk for preeclampsia be treated with daily low-dose aspirin until the time of delivery. A daily calcium supplement may also help prevent preeclampsia for women who do not consume enough calcium in their diets.
Men who have erectile dysfunction have a higher risk of stroke (both ischemic and hemorrhagic) than men without erectile dysfunction.
Obstructive sleep apnea is a common sleep disorder that occurs when tissues in the upper airways come too close to each other during sleep, temporarily blocking the inflow of air. People with untreated sleep apnea are at increased risk for many heart problems, including stroke. Current guidelines recommend screening and treating sleep apnea in people who have had a stroke or TIA.
Sickle Cell Disease
People with sickle cell disease are at increased risk for stroke at a young age.
Some research suggests that depression may increase the risk for stroke.
Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen (Advil, Motrin, generic) and diclofenac (Cataflam, Voltaren, generic) may increase the risk of stroke, especially for patients who have other stroke risk factors.
Stroke is the fourth leading cause of death in the United States. However, mortality rates are declining. Over 75% of people survive a first stroke during the first year, and over half survive beyond 5 years.
People who suffer ischemic strokes have a much better chance for survival than those who have hemorrhagic strokes. Among the ischemic stroke categories, the greatest dangers are posed by embolic strokes, followed by thrombotic and lacunar strokes.
Hemorrhagic stroke not only destroys brain cells, it also poses other complications, including increased pressure on the brain or spasms in the blood vessels, both of which can be very dangerous. However, studies suggest that survivors of hemorrhagic stroke have a greater chance for recovering function than those who survive ischemic stroke.
Many people are left with physical weakness and often have accompanying pain and spasticity (muscle stiffness or spasms). Depending on the severity of the symptoms and how much of the body is involved, these impairments can affect the ability to walk, to rise from a chair, to feed oneself, to speak, write or use a computer, to drive, and to perform many other activities.
Many stroke survivors recover functional independence after a stroke. But 25% are left with a minor disability, and 40% experience moderate-to-severe disabilities. The National Institutes of Health (NIH) has a stroke scale that helps predict the severity and outcome of a stroke by scoring 11 factors:
People with ischemic strokes who score less than 10 have a favorable outlook after a year. Only 4% to 16% of people do well if their score is more than 20.
The risk for recurring stroke is highest within the first few weeks and months of the previous stroke. But about 25% of people who have a first stroke will go on to have another stroke within 5 years. Risk factors for recurrence include:
People at risk and partners or caretakers of people at risk for stroke should be aware of its typical symptoms. The stroke victim should get to the hospital as soon as possible after these warning signs appear. It is particularly important for people with migraines or frequent severe headaches to understand how to distinguish between their usual headaches and symptoms of a stroke.
Time is of the essence in treating stroke. Studies show that people receive faster treatment for stroke if they arrive by ambulance rather than coming to the emergency room on their own. People should immediately call 9-1-1 for emergency assistance if they have any warning signs of stroke:
An easy way to remember the signs of stroke, and what to do, is by the acronym F.A.S.T. If you think you or someone else is having a stroke, the National Stroke Association's F.A.S.T. test advises:
The symptoms of a transient ischemic attack (TIA) and early ischemic stroke are similar. However, in the case of a TIA, the symptoms resolve and there is no evidence for infarction (brain cell death), for example on an imaging test (CT or MRI). Symptoms depend on where the injury in the brain occurs. The origin of the stroke is usually either the carotid or basilar arteries.
The build-up of plaque in the internal carotid artery may lead to narrowing and irregularity of the artery's lumen, preventing proper blood flow to the brain. More commonly, as the narrowing worsens, a clot forms, then pieces of clot break free, travel to the brain, and block blood vessels that supply blood to the brain. This leads to stroke, with possible paralysis or other deficits.
Symptoms From Blockage in the Carotid Arteries
The carotid arteries branch off of the aorta (the primary artery leading from the heart) and lead up through the neck, around the windpipe, and into the brain. When TIAs or strokes result from clots that form on blockages in the carotid artery, symptoms may occur in either the retina of the eye or the cerebral hemisphere (the large top part of the brain).
Symptoms From Blockage in the Basilar Artery
The basilar artery is formed at the base of the skull from the vertebral arteries, which run up along the spine and join at the back of the head. When stroke or TIAs originate here, both hemispheres of the brain may be affected so that symptoms occur on both sides of the body. The following symptoms may develop:
Such strokes usually occur in the brain stem, which can have profound effects on breathing, blood pressure, heart rate, and other vital functions, but may have no effect on thinking or language.
Speed of Symptom Onset
The speed of symptom onset of a major ischemic stroke may indicate its source:
Intracerebral Hemorrhage Symptoms
Symptoms of an intracerebral, or parenchymal, hemorrhage typically begin very suddenly, evolve over several hours, and include:
When the hemorrhage is a subarachnoid type, warning signs may occur from the leaky blood vessel a few days to a month before the aneurysm fully develops and ruptures. Warning signs may include:
When the aneurysm ruptures, the stroke victim may experience:
A diagnostic work-up for stroke includes physical and neurological examinations, patient's medical history, blood tests (to measure blood glucose levels, blood coagulation time, cardiac enzymes, and other factors), and imaging tests. Many of the same procedures are used to diagnose a stroke and to evaluate the risk of future major stroke in people who have had a transient ischemic attack (TIA).
For people who have suffered a stroke, the first step is to determine as quickly as possible whether the stroke is ischemic (caused by blood clot blockage) or hemorrhagic (caused by bleeding). A CAT scan of the head is done as soon as possible. Tissue plasminogen activator (tPA), also known as a clot-busting drug therapy, can be life-saving for ischemic stroke patients. The sooner tPA is administered intravenously, the more likely a person is to benefit and the medicine must be given no later than 3 to 4 ½ hours after the stroke starts. However, if the stroke is caused by a hemorrhage, thrombolytic drugs will increase the bleeding and can be lethal.
Time is a critical factor in treating stroke. Doctors do not want to delay treatment too long by doing too many diagnostic tests. When a person arrives in the emergency department, the doctor may recommend one or more of the following tests:
Because therapy must be administered so quickly, usually only a CT scan is done before treatment starts. A CT angiogram is often done at the same time as the CT since it can determine the presence of blood clots. People on blood thinners or who have bleeding problems may need blood work before they can be treated with tPA.
Several different types of blood tests are used to determine the patient's condition. They include blood tests for:
Computed Tomography and Magnetic Resonance Imaging
Computed tomography (CT) and magnetic resonance imaging (MRI) scans are the standard imaging tests to diagnose strokes. They help distinguish between ischemic and hemorrhagic strokes. These tests can show signs of bleeding and can also help indicate whether a stroke is recent.
MRIs are also the preferred imaging technique for evaluating patients with probable TIA and can detect very tiny hemorrhages. However, an MRI can take longer to perform than a CT and is sometimes not as widely available. For these reasons, a CT scan may be used as the initial imaging test instead of MRI.
CT and MR perfusion
These tests use special software with a CT or MRI scan to determine the amount of brain injury that may be permanent.
Magnetic Resonance Angiography and Computerized Tomography Angiography
Magnetic resonance angiography (MRA) and computerized tomography angiography (CTA) of the head and neck are noninvasive ways of evaluating the carotid arteries and the arteries in the brain. In many situations, these tests can be used instead of cerebral angiography.
CTA or MRA are recommended ahead of treating an ischemic stroke with a method called mechanical thrombectomy. In some stroke centers, specialized imaging called CT perfusion better identifies people who are more likely to benefit from treatment.
Carotid ultrasound procedures are valuable tools for measuring the width of the artery and how the blood flows through it. Carotid ultrasounds can help determine the severity of plaque build-up and narrowing and blocking of the carotid arteries (carotid stenosis).
In carotid ultrasounds, high-frequency sound waves are directed from a hand-held transducer probe to the target area. These waves "echo" off the arterial structures and produce a two-dimensional image on a monitor, which will make obstructions or narrowing of the arteries visible. As most people get thorough imaging of their carotid arteries with CT or MRI, ultrasound has a limited role in stroke treatment. Ultrasound also does not provide information about the basilar or vertebral arteries.
Cerebral angiography is an invasive procedure that may be used for patients with stroke or TIAs who may need a procedure. It requires the insertion of a catheter into the groin, which is then threaded up through the arteries to the base of the carotid artery. At this point, a dye is injected, and x-rays, CTs, or MRI scans determine the location and extent of the narrowing, or stenosis, of the artery.
This is an ultrasound test that can detect narrowing of the blood vessels within the skull. It is also non-invasive but is not used as commonly.
A heart evaluation using an electrocardiogram (ECG) is important in any patient with a stroke or suspected stroke. An ECG records the electrical current in the heart muscle. It may detect arrhythmias such as atrial fibrillation (a major cause of stroke) or give clues as to other heart problems.
An echocardiogram uses ultrasound to view the chambers and valves of the heart. It is generally useful for stroke patients to identify blood clots or risk factors for blood clots that can travel to the brain and cause stroke. There are two types of echocardiograms:
People who have a TIA are at increased risk for a major stroke in the days and weeks that follow. The ABCD2 score is a tool that helps doctors predict short-term stroke risk following a TIA. The ABCD2 score assigns points for various factors, including:
Based on the number of points, a doctor can identify whether a patient is at low, moderate, or high risk of having a stroke within 2 days after a TIA. The ABCD2 score can help doctors better decide which people need hospitalization and emergency care.
A stroke requires immediate emergency treatment. It is critical to get to the hospital and be diagnosed as soon as possible. There are several steps in the initial assessment and management of stroke.
Receiving treatment early is essential in reducing the damage from a stroke. The chances for survival and recovery are also best if treatment is received at a hospital specifically certified as a primary stroke center.
Immediate treatment of ischemic stroke aims at dissolving the blood clot. People who arrive at the emergency room with signs of acute ischemic stroke are usually given aspirin to help thin the blood. Aspirin can be lethal for people suffering a hemorrhagic stroke, so it is best not to take aspirin at home and to wait until after the doctor has determined what kind of stroke has occurred. If a person might need other treatment like tPA, aspirin may be avoided.
If people can be treated within 3 to 4.5 hours of stroke onset (when symptoms first appear), they may be candidates for thrombolytic ("clot-buster") drug therapy. Thrombolytic drugs are used to break up existing blood clots. The standard thrombolytic drugs are tissue plasminogen activators (tPAs). They include alteplase (Activase) and tenecteplase (TNKase).
The following steps are critical before injecting a clot-buster drug:
Thrombolytics carry a risk for hemorrhage, so they may not be appropriate for people with existing risk factors for bleeding. Blood pressure must be controlled before and after tPA is given. If the blood pressure is too high, there is great risk of bleeding after tPA.
A clot-buster drug is usually administered through an intravenous injection. Less commonly, the drug may be administered through a catheter that is inserted in the groin and threaded through to the arteries in the brain (a procedure called intra-arterial thrombolysis).
Another alternative treatment for clot removal is called mechanical thrombectomy. It uses a self-expanding stent (wire mesh) called a stent retriever to capture and retrieve the clot. The device is inserted into the blocked artery through a catheter and then removed along with the clot.
Before mechanical thrombectomy, an urgent imaging test like CT angiogram or magnetic resonance (MR) angiogram is recommended.
Specific criteria are used to determine which patients are candidates for mechanical thrombectomy. Benefit appears to be highest in selected people who:
Treatment of hemorrhagic stroke depends in part on whether the stroke is caused by bleeding between the brain and the skull (subarachnoid hemorrhage) or within the brain tissue (intracerebral hemorrhage). Both medications and surgery may be used.
Various types of drugs are given depending on the cause of the bleeding. If high blood pressure is the cause, antihypertensive medications are administered to lower blood pressure. If anticoagulant medications such as warfarin (Coumadin, generic) or heparin are the cause, they are immediately discontinued and other drugs may be given to increase blood coagulation. Other drugs, such as the calcium channel blocker nimodipine (Nimotop), can help reduce the risk of ischemic stroke following hemorrhagic stroke.
Surgical treatments depend on the cause of the hemorrhagic stroke:
An intraventricular catheter may be surgically inserted into the ventricles of the brain to relieve pressure.
In the days following stroke, people are at risk for complications. The following steps are important.
Maintain Adequate Delivery of Oxygen
It is very important to maintain oxygen levels. In some cases, airway ventilation may be required. Supplemental oxygen may also be necessary for patients when tests suggest low blood levels of oxygen.
Fever should be monitored and aggressively treated with medication and, if needed, a cooling blanket since its presence predicts a poorer outlook.
People should have their swallowing function evaluated before they are given any food, fluid, or medication by mouth. If people cannot adequately swallow they are at risk of choking. People who cannot swallow on their own may require nutrition and fluids delivered intravenously or through a tube placed in the nose.
Maintaining a healthy electrolyte balance (the ratio of sodium, calcium, and potassium in the body's fluids) is critical.
Control Blood Pressure
Managing blood pressure is essential, but complicated. Blood pressure often declines spontaneously in the first 24 hours after stroke. People whose blood pressure remains elevated should be treated carefully with antihypertensive medications.
Monitor Increased Brain Pressure
Hospital staff should watch closely for evidence of increased pressure on the brain (cerebral edema), which is a frequent complication of hemorrhagic strokes. It can also occur a few days after ischemic strokes. Early symptoms of increased brain pressure are drowsiness, confusion, lethargy, weakness, and headache. Medications such as mannitol may be given during a stroke to reduce pressure or the risk for it. An intracranial pressure (ICP) monitor may be inserted to assess the brain pressure response to treatment.
Keeping the top of the body higher than the lower part, such as by elevating the head of the bed, can reduce pressure in the brain and is standard practice for people with ischemic stroke. However, this practice also lowers blood pressure in general, which may be dangerous for people with a massive stroke.
Monitor the Heart
People must be monitored using electrocardiography to check for atrial fibrillation and other heart rhythm problems. People are at high risk for heart attack following stroke.
Control Blood Sugar (Glucose) Levels
Elevated blood sugar (glucose) levels can occur with severe stroke and may be a marker of serious trouble. People with high blood glucose levels may require insulin therapy.
Monitor Blood Coagulation
Regular tests for blood coagulation are important to make sure that the blood is not so "thick" that it will clot nor so "thin" that it causes bleeding.
Check for Deep Venous Thrombosis
Deep venous thrombosis (DVT) is a blood clot in the veins of the lower leg or thigh. It can be a serious post-stroke complication because there is a risk of the clot breaking off and traveling to the brain or heart. DVT can also cause pulmonary embolism if the blood clot travels to the lungs. If necessary, an anticoagulant drug will be given.
People who have had a stroke are at increased risk for pneumonia, urinary tract infections, and other widespread infections.
People who have had a first stroke or TIA are at high risk of having another stroke. Secondary prevention measures are essential to reduce this risk.
Smoking is a major risk factor for stroke. People should also avoid exposure to second-hand smoke.
People should make dietary changes to follow a diet rich in fruits and vegetables, high in potassium, and low in saturated fats. Everyone should limit sodium (salt) intake to less than 2,400 mg/day, and some people may benefit from limiting sodium to less than 1,500 mg/day. Sodium restriction is particularly important for people over age 50, all African-Americans, and everyone with high blood pressure. For diet plans, the Dietary Approaches to Stop Hypertension (DASH) diet and the Mediterranean diet may be particularly good choices for reducing the risk for stroke.
Exercise helps reduce the risk of atherosclerosis, which can help reduce the risk of stroke. Doctors recommend at least 30 minutes of exercise on most, if not all, days of the week.
Maintain Healthy Weight
People who are overweight should try to lose weight through healthy diet and regular exercise.
Limit Alcohol Consumption
Heavy alcohol use and binge drinking increase the risk of both ischemic and hemorrhagic stroke. If you drink, limit alcohol to no more than one drink a day for women or two drinks a day for men.
Your doctor may suggest taking aspirin or, if you cannot take aspirin, another antiplatelet drug such as clopidogrel (Plavix, generic) or ticagrelor (Brilinta) to help prevent blood clots from forming in your arteries or your heart. These medicines are called antiplatelet drugs. These drugs make blood platelets less sticky and therefore less likely to form a clot. You should never start or stop taking aspirin without first talking to your doctor.
Primary Prevention (to prevent a first stroke)
Primary prevention is when antiplatelet drugs are taken before a stroke or a TIA has occurred. Before deciding whether someone should take aspirin to prevent a stroke caused by a blockage in an artery (ischemic stroke), your doctor must consider whether you are at an increased risk of strokes caused by bleeding in the brain (hemorrhagic stroke), as well as bleeding elsewhere in the body.
The American Heart Association (AHA) recommends that people who have heart disease should take daily low-dose aspirin (81 mg a day), if told to by their doctor, for primary prevention of stroke or heart attack. Aspirin therapy may also be recommended as primary prevention for certain patients at increased risk for heart disease (for example, people with diabetes who smoke). New guidelines on stroke prevention in women recommend low-dose aspirin therapy for people with pregnancy-related hypertension (preeclampsia).
For these people, the benefits of aspirin outweigh its risks, which include bleeding in the stomach and brain. Healthy people who do not have heart disease, or a history of heart attack or stroke, should not take daily aspirin.
Secondary Prevention (to prevent another stroke after one has occurred)
After an ischemic stroke or a TIA, aspirin alone or aspirin plus the antiplatelet drug dipyridamole (Persantine, or Aggrenox when combined in one pill with aspirin) given twice daily is recommended to prevent another stroke.
Clopidogrel (Plavix, generic) may be used in place of aspirin for patients who have narrowing of the coronary arteries or who have had a stent inserted. Combining aspirin and clopidogrel together does not have any more benefit and increases the risk for hemorrhage (although some people who have had a coronary artery stent placed may need to be on this combination to keep their stents open).
Anticoagulants are also referred to as anti-clotting or "blood thinner" drugs. They are used to help prevent blood clots and stroke. They are generally considered the best medications for stroke prevention for most patients with atrial fibrillation who are at medium to high risk for stroke.
Anticoagulants may also be recommended for those with rheumatic heart disease, dilated cardiomyopathy, prosthetic or man-made heart valve, and a blood clot that remains in the left ventricle (ventricular thrombus).
Warfarin (Coumadin, generic) has been the main anticoagulant ("blood thinner") drug used to prevent strokes in high-risk patients with atrial fibrillation. Like all anticoagulants, warfarin carries a risk for bleeding. But for most people, its benefits far outweigh its risks. The risk for bleeding is highest when warfarin therapy is first started, with higher doses, and with long periods of treatment. People at risk for bleeding are usually older (over 65) and have a history of stomach bleeding, uncontrolled high blood pressure, alcohol abuse, or abnormal liver or kidney function.
It is important that patients who take warfarin have their blood checked regularly to make sure that it does not become "too thin." Blood that is too thin increases the risk for bleeding, while blood that is "too thick" increases the risk for blood clots and stroke. Prothrombin time (PT) and international normalized ratio (INR) tests are used to monitor blood coagulation.
People who take warfarin need to be careful about the amount of vitamin K they consume from foods in their diet. Too much vitamin K can weaken warfarin's effectiveness. Foods and beverages that are rich in vitamin K include kale, spinach, collard greens, mustard greens, chard, parsley, and green tea. Also, cranberry juice and alcohol can increase the effects of warfarin and the risks for bleeding. Talk with your doctor about any changes to your diet that you may need to make.
Alternatives to Warfarin
In recent years, several new anticoagulants have been approved as alternatives to warfarin for preventing stroke and blood clots in people with atrial fibrillation that is not caused by a heart valve problem. These newer anticoagulants are dabigatran (Pradaxa), rivaroxaban (Xarelto), and apixaban (Eliquis). The FDA warns that these new anticoagulants should not be used by people who have mechanical heart valves. (Warfarin is recommended for treating atrial fibrillation in people who have mechanical heart valves.)
Unlike warfarin, these drugs do not require regular blood test monitoring. However, dabigatran and rivaroxaban need to be taken twice-daily (warfarin and apixaban are taken once a day). Dabigatran appears to cause more gastrointestinal problems (indigestion, upset stomach, abdominal pain) than the other anticoagulants. Compared to warfarin, dabigatran also has a higher risk for gastrointestinal bleeding. But it has a lower risk for bleeding in the brain and clot-related strokes. There are some other differences between the various medications including that some must be used with caution in patients with kidney problems.
All anticoagulant drugs increase the risk for bleeding. A concern with the newer anticoagulants is that if bleeding does occur, the drug effect is irreversible. In contrast, vitamin K or the administration of fresh frozen plasma (a donated blood product) can rapidly reverse the anticoagulant effect of warfarin.
The Watchman device is implanted into the heart of some patients with atrial fibrillation. It closes off part of the heart chamber where clots most likely form. This is a better choice for some patients who are at high risk for blood thinners.
People with diabetes should aim for good blood glucose level control with a goal of hemoglobin A1c levels of around 7%. Blood pressure goals for people with diabetes should generally be 130/80 mm Hg or less.
High blood pressure (hypertension) increases the risk for stroke. A normal blood pressure is below 120/80. High blood pressure is above 130/90. Reducing high blood pressure is essential in stroke prevention. In general, most patients with hypertension should aim for blood pressure below 130/90 mm Hg.
Drug therapy is recommended for people with hypertension who cannot control their blood pressure through diet and other lifestyle changes. Many different types of drugs are used to control blood pressure. They include diuretics, ACE inhibitors, angiotensin-receptor blockers, beta-blockers, and calcium channel blockers.
Hypertension is a disorder characterized by chronically high blood pressure. It must be monitored, treated, and controlled by medication, lifestyle changes, or a combination of both.
For people with TIA or ischemic stroke due to atherosclerosis, high-intensity step therapy is recommended, regardless of baseline total LDL cholesterol level. Statin brands include lovastatin (Mevacor, generic), pravastatin (Pravachol, generic), simvastatin (Zocor, generic), fluvastatin (Lescol), atorvastatin (Lipitor, generic), rosuvastatin (Crestor), and pitavastatin (Livalo).
The 2 main surgical procedures for stroke prevention are carotid endarterectomy (CAE) and carotid angioplasty with stenting (CAS).
Current guidelines from the American Heart Association and the American Stroke Association recommend considering a patient's age when choosing between these procedures:
There are also other reasons to choose one procedure over the other. These reasons include surgical risk factors and anatomic considerations (where the blockages are located).
Carotid endarterectomy is a surgical procedure that cleans out plaque and opens up the narrowed carotid arteries in the neck. It is recommended to prevent ischemic stroke in some patients who have symptoms of carotid artery stenosis and carotid narrowing of 70% to 99%.
For people whose carotid arteries are narrowed by 50% or less, antiplatelet medications are usually recommended in place of surgery. For patients with moderate stenosis (50% to 69%), the decision to perform surgery needs to be determined on an individual basis.
There is a risk of a heart attack or stroke from the procedure. Anyone undergoing this procedure should be sure their surgeon is experienced in performing this procedure and that the medical center has complication rates of less than 6%. Carotid endarterectomy is generally not recommended for patients with acute stroke.
A carotid endarterectomy involves:
Endarterectomy is a surgical procedure that removes plaque material from the lining of an artery.
Carotid angioplasty and stenting (CAS) may be used as an alternative to carotid endarterectomy for some people. It is based on the same principles as angiography done for heart disease.
This procedure carries a risk for an embolic stroke and other complications. It is often used in hospitals as an alternative procedure for people who cannot undergo endarterectomy, especially for people with severe stenosis (blockage greater than 70%) and high surgical risk.
Similar procedures to those done to treat carotid artery narrowing have been studied for the vertebral arteries. However, vertebral artery angioplasty and stenting carry a lot more risk of bad outcomes during and after the surgery. As a result, medical treatment only is recommended for symptoms or findings in the vertebral artery system.
If unruptured aneurysms are discovered in time, they can be treated before causing problems. People who are known to have an aneurysm may need regular doctor visits to make sure the aneurysm is not changing size or shape.
Treating high blood pressure may reduce the chance that an existing aneurysm will rupture. Controlling risk factors for atherosclerosis may reduce the likelihood of aneurysms from expanding or rupturing.
The decision to repair an unruptured cerebral aneurysm is based on the size and location of the aneurysm, and the patient's age and general health.
Two common methods are used to repair an aneurysm:
During aneurysm clipping:
During endovascular repair of an aneurysm:
Most people who survive a stroke will have some type of disability. But many people are able to make significant improvements through rehabilitation. According to the National Stroke Association:
For the best chance of improvement and regaining abilities, it is important that rehabilitation starts as soon as possible after a stroke. Rehabilitation therapy is started in the hospital as soon as a person's condition has stabilized. Initial range of motion exercises involve a nurse or physical therapist moving a patient's affected limb (passive exercise) and having the patient practice moving the limb (active exercise). People are encouraged to gradually sit, stand, and walk, and then perform tasks of daily living (such as bathing, dressing, and using the toilet).
Some people will experience quick recovery and regain functional abilities in the first few days, while others will continue to show improvement during the first 6 months or longer. Recovery is an ongoing process and with good rehabilitation providers and family support, people can continue to make progress.
Once a person has been discharged from the hospital, rehabilitation continues at home or in an outpatient program. Some people may be transferred to a rehabilitation hospital before going home. Others may require care in a long-term or skilled nursing facility. In addition to the ongoing care of a primary care physician or neurologist, a rehabilitation team may include:
A stroke can cause various disabilities. The type of disability depends on which part of the brain was damaged. According to the U.S. National Institutes of Health, the five main types of stroke disabilities are:
Because stroke affects different parts of the brain, specific approaches to managing rehabilitation vary widely among individual people:
Medication can sometimes help relieve specific effects of stroke:
A stroke is emotionally challenging both for patients and their families. The caregiver's emotions and responses to the patient are critical. People do worse when caregivers are depressed, overprotective, or not knowledgeable about the stroke. They do best when caregivers and family are encouraging and supportive. Everyone benefits when people are able to function as independently as possible to the best of their abilities.
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