What is a stroke?
A stroke or a brain attack occurs when a blood clot blocks a blood vessel or when a blood vessel bursts, interrupting blood flow to an area of the brain.
An ischemic stroke occurs when the blood vessel is blocked. This is the most common type of stroke.
A hemorrhagic stroke (brain bleed) occurs when a blood vessels breaks. This type of stroke is less common.
What happens to the brain when a stroke occurs?
The brain needs oxygen in the blood to survive, when the blood flow is disrupted, the cells in the part of the brain that were receiving this blood can die. These cells usually die within minutes to a few hours after the stroke starts. When cells die, chemicals are released that can cause even more cells to die. This is why there is a small window of opportunity for treatment of ischemic stroke.
The most important thing to remember is that the earlier a stroke victim gets to the emergency department, the better the chance that they will be able to receive treatment that stops or reduces the amount of brain damage from the stroke.
When brain cells die, functions that were under control of the dying brain are lost. These include functions such as language, speech, movement, and sensation. The specific abilities lost or affected depend on where in the brain the stroke occurs and on the size of the stroke.
For example, someone who has a small stroke may experience only minor effects such as weakness of an arm or leg. On the other hand, someone who has a larger stroke may be left paralyzed on one side or lose his/her ability to express and process language. Some people recover completely from less serious strokes, while other individuals lose their lives to very severe strokes.
What are the risk factors for stroke?
Risk factors are medical conditions or lifestyle practices that can increase one’s chance of having a stroke.
Risk factors can be modifiable (things we can change) or non-modifiable (things we cannot change).
Non-modifiable risk factors include age, race, and gender.
Hypertension (high blood pressure) is the most important modifiable risk factor for both types of stroke.
Other important risk factors include tobacco use, diabetes, high cholesterol, lack of physical activity, unhealthy diet, drug use, and excess alcohol intake.
Atrial fibrillation, an abnormal heart rhythm that causes clots to develop in the heart is another important risk factor for stroke, especially among those of older age.
What are the most common stroke symptoms?
- Sudden numbness or weakness of face, arm or leg, especially on one side of the body
- Sudden confusion, trouble speaking or understanding
- Sudden trouble seeing in one or both eyes
- Sudden trouble walking, dizziness, loss of balance or coordination
- Sudden severe headache with no known cause
Other important but less common stroke symptoms
- Sudden nausea and vomiting
- Brief loss of consciousness or period of decreased consciousness (fainting, confusion, convulsions or coma)
The only FDA approved treatment for ischemic stroke is a medication called tPA which stands for tissue plasminogen activator.
This “brain saving” treatment dissolves the clot that is causing the stroke. This medication can only be given through an IV given within 4.5 hours after a stroke begins. The sooner the medicine is given, the better the chances of restoring oxygen to the dying brain in time to prevent more damage.
Depending on the type of hemorrhagic (bleeding) stroke that occurs, there are different options for treatment including surgery.
Strokes are preventable. It is estimated that up to 80% of strokes can be prevented by addressing modifiable risk factors. When a person has a stroke, their risk of having another stroke is increased. When a person is treated for a stroke, medications and recommendations are given to prevent further strokes.
Decreasing your risk
- Identify and treat high blood pressure
- Identify and treat diabetes
- Stop smoking
- Identify and treat high cholesterol
- Take blood thinners if recommended by your doctor
- Exercise regularly ( more than 30 minutes most days of the week)
- Avoid high sodium and excess fat in diet in order to maintain a healthy weight and prevent development of hypertension and diabetes