What is a Stroke?
A stroke, or “brain attack,” occurs when blood flow to the brain is interrupted by a blood clot or when a blood vessel bursts. This typically occurs when a blood vessel in or around the brain gets blocked or ruptures. The lack of oxygen kills brain cells in the immediate area, often causing symptoms such as weakness or numbness on one side of the body, trouble walking or talking or vision changes.
Every 40 seconds someone in the U.S has a stroke- the #1 cause of disability and #3 cause of death.
What is A TIA?
A Transient Ischemic Attack or TIA, also known as a mini-stroke, has symptoms that are identical to a stroke, but they last typically only a few minutes or hours. They are important because they often herald a stroke occurring in the next few days or weeks.
Call 911 for help if you think someone is having any of these symptoms. Treatments will need to be initiated within a few hours to be most effective. The symptoms of stroke are distinct because they happen so quickly:
- Sudden numbness or weakness of the face, arm or leg (especially on one side of the body)
- Sudden confusion, trouble speaking or understanding speech
- Sudden trouble seeing in one or both eyes
- Sudden trouble walking, dizziness, loss of balance or coordination
- Sudden severe headache with no known cause
As soon as a quick neurological examination is completed, the most important next step is to take a picture of the brain with a head CT scan or a brain MRI. The blood vessels going to the brain and within the brain can also be imaged using ultrasound, CT angiography and MR techniques such as an MR angiogram.
The treatment of stroke varies greatly depending on the type of stroke, its location, the patient’s risk factors, and a host of other factors. A patient with an ischemic stroke may be treated with a clot-buster medication called tPA, which must be used within three hours of stroke onset. Patients with bleeding in the brain might benefit from some types of surgery, depending on the type of stroke and its location.
Control of risk factors such as high blood pressure, high cholesterol, diabetes and smoking can reduce the risk of a first or recurrent stroke. To prevent ischemic strokes blood thinners such as aspirin or Plavix® are often used. In some cases, another type of blood thinner such as warfarin can be used to prevent a stroke from atrial fibrillation. Surgery or endovascular stenting of the carotid artery in the neck can be useful for stroke prevention if the artery has a significant blockage.