Left-side Stroke

The cerebrum is the largest part of the brain. It is made of a left and a right hemisphere. In most people, the left hemisphere is in charge of the functions on the right-side of the body. It is also involved in abilities such as the ability to speak, or use language. A left-side stroke happens when the blood supply to the left side of the brain is interrupted. Without oxygen and nutrients from blood, the brain tissue quickly dies. There are two main types of stroke ischemic and hemorrhagic. An ischemic stroke is the most common type of stroke.

  • Causes

    An ischemic stroke is caused by a blockage of the blood flow, which may be due to:

    • A clot from another part of the body like the heart or neck. The clot breaks off and flows through the blood until it becomes trapped in a blood vessel supplying the brain.
    • A clot that forms in an artery that supplies blood to the brain.
    • A tear in an artery supplying blood to the brain. Called an arterial dissection.

    A hemorrhagic stroke is caused by a burst blood vessel. Blood spills out of the broken blood vessel and pools in the brain. This interrupts the flow of blood and causes a build up of pressure on the brain.

    Hemorrhagic vs. Ischemic Stroke
    factsheet image
    Copyright © Nucleus Medical Media, Inc.

  • Definition

    The cerebrum is the largest part of the brain. It is made of a left and a right hemisphere. In most people, the left hemisphere is in charge of the functions on the right-side of the body. It is also involved in abilities such as the ability to speak, or use language.

    A left-side stroke happens when the blood supply to the left side of the brain is interrupted. Without oxygen and nutrients from blood, the brain tissue quickly dies.

    cerebrum
    Copyright © Nucleus Medical Media, Inc.

    There are two main types of stroke ischemic and hemorrhagic. An ischemic stroke is the most common type of stroke.

  • Diagnosis


    The doctor will do a physical exam and look for muscle weakness, visual and speech problems, and movement difficulty. If possible, you will be asked about your symptoms and medical history. Your doctor may use a CT scan or
    MRI scan
    of the brain to confirm a stroke or rule out other conditions.

    Your doctor may also order tests that create detailed images of blood vessels. These test will help see which blood vessels may be creating the problem:

    • Magnetic resonance angiography
      (MRA)

      —maps blood flow
    • CT angiogram (CTA)—creates detailed images of the blood vessels and their blood flow
    • Doppler ultrasound
      —evaluates flow of blood in the head and neck

    Blood tests can also help determine if there is a bleeding problem.

  • Prevention

    Many of the risk factors for stroke can be changed. Lifestyle changes that can help reduce your chance of getting a stroke include:

    • Exercise regularly.

    • Eat more
      fruits, vegetables
      , and
      whole grains
      . Limit dietary
      salt
      and
      fat
      .
    • Stop smoking
      .
    • Increase your consumption of fish.
    • Drink alcohol only in moderation (1-2 drinks per day).
    • Maintain a healthy weight.
    • Check blood pressure frequently
      . Follow your doctor's recommendations for keeping it in a safe range.
    • Take aspirin if your doctor says it is safe.
    • Keep chronic medical conditions under control. This includes high cholesterol and diabetes.
    • Talk to your doctor about the use of a statins. These types of drugs may help prevent certain kinds of strokes in some people.
    • Seek medical care if you have symptoms of a stroke, even if symptoms stop.
    • Stop the use of recreational drugs such as cocaine.

  • Risk Factors

    Certain factors increase your risk of stroke but can not be changed, such as:

    • Race—People of African American, Hispanic, or Asian/Pacific Islander descent are at increased risk.
    • Age: Older than 55 years of age
    • Family history of stroke

    Other factors that may increase your risk can be changed such as:

    • Drug abuse
      from cocaine, amphetamines, or heroin use
    • Smoking
    • Physical inactivity

    Certain medical condition that can increase your risk of stroke. Management or prevention of these conditions can significantly decrease your risk. Medical conditions include:

    • High blood pressure
    • High cholesterol levels—specifically high-LDL bad cholesterol
    • Low bone mineral density, especially in women
    • Obesity and metabolic syndrome
    • High blood homocysteine level
    • Atherosclerosis
    • Diabetes mellitus
      or impaired glucose tolerance
    • Atrial fibrillation
    • Blood disorders such as sickle cell disease
      and polycythemia
    • Vascular dementia
    • Disease of heart valves, such as
      mitral stenosis

    • Prior stroke or cardiovascular disease, such as
      heart attack
    • Peripheral artery disease
    • Transient ischemic attack (TIA)
      —a warning stroke with stroke-like symptoms that go away shortly after they appear
    • Conditions that increase your risk of blood clots such as:
      • Cancer
      • Certain autoimmune diseases
    • Migraine with aura
    • Having a blood vessel abnormality

    Risk factors specific to women include:

    • Previous pre-eclampsia
    • Use of birth control pills,
      especially if you are over 35 years old and smoke

    • Long-term use of
      hormone replacement therapy
    • Menopause
    • Pregnancy—due to increased risk of blood clots

  • Symptoms

    Symptoms occur suddenly. Exact symptoms will depend on the part of the brain affected. Rapid treatment is important to decrease the amount of brain damage. Brain tissue without blood flow dies quickly.

    Call for emergency medical help
    right away if you notice any of the following:

    • Sudden weakness or numbness of face, arm, or leg, especially on the right side of the body
    • Sudden confusion
    • Sudden trouble speaking or understanding
    • Sudden trouble seeing in one or both eyes
    • Sudden dizziness, trouble walking, loss of balance, or coordination
    • Sudden severe headache with no known cause

    If you or someone you know has any of these symptoms,
    call for emergency medical services right away. Brain tissue without blood flow dies quickly. Early care can decrease damage.

    Longer-lasting effects of the stroke may include problems with:

    • Left-sided weakness and/or sensory problems
    • Speaking and swallowing
    • Vision (eg, inability for the brain to take in information from the left visual field)
    • Perception and spatial relations
    • Attention span, comprehension, problem solving, judgment
    • Emotions
    • Interactions with other people
    • Activities of daily living (eg, going to the bathroom)

    • Mental health (eg,
      depression
      , frustration, impulsivity)

  • Treatment

    Immediate treatment is needed to:

    • Dissolve or remove a clot causing an ischemic stroke
    • Stop the bleeding during a hemorrhagic stroke

    Oxygen therapy
    may be needed.