What is a Stroke?
A stroke (also known as a cerebral vascular accident or brain attack) occurs when the blood supply to your brain is reduced or interrupted by a blood clot or a hemorrhage. This deprives the brain of oxygen and nutrients and causes brain cells to die. Roughly 2 million brain cells die during every minute of a stroke, increasing risk of death or brain damage.
In the United States, nearly:
- 800,000 people have a stroke each year.
- 600,000 of these are first (new) strokes.
- 185,000 strokes (1 in 4) are in people who have had a stroke before.
- 130,000 Americans die from stroke each year; that’s one person every 4 minutes.
Stroke Warning Signs
The five warning signs of stroke are:
- Sudden onset of weakness or numbness on one side of the body
- Sudden speech difficulty or confusion
- Sudden difficulty seeing in one or both eyes
- Sudden onset of dizziness, trouble walking or loss of balance
- Sudden, severe headache with no known cause
If you experience any of these symptoms,
call 911 immediately and the ambulance will take you to the nearest emergency room.
Stroke Risk Factors
Alexander Khalessi, MD, discusses treatment options, prevention and advances in care for people who experience stroke. -
The following are risk factors for stroke and may be modified to lower your risk:
- High blood pressure
Atrial fibrillation (irregular heartbeat)
- Elevated cholesterol
- Being overweight
- Tobacco usage
- Heavy alcohol consumption
There are two types of stroke:
Ischemic stroke: Occurs when blood vessels are blocked by a clot. 87 percent of strokes are ischemic.
Hemorrhagic stroke: Occurs as a result of a rupture or perforation of blood vessels within the brain. The most important risk factor for hemorrhagic strokes is arterial hypertension.
Transient ischemic attack (TIA): Commonly referred as “mini-strokes," a TIA may only last for a few minutes. While symptoms are temporary, TIAs are a warning sign of the potential for a future stroke. The occurrence of TIAs increase with age. Approximately 40 percent of people who experience a TIA will go on to have a stroke.
The prevention of stroke may be thought of as a three-part process:
- Modification of lifestyle
- Selection of the appropriate prevention medications (e.g., aspirin,
- Surgical procedures to remove blockages in arteries that could lead to a stroke
Our team works closely with you to help prevent stroke. We provide:
- Careful review of your medical history and thorough neurological exam.
- Access to studies and clinical trials for which you may be a candidate.
- An individualized stroke prevention plan (taking personal risk factors into account).
To schedule an appointment at the UC San Diego Stroke Center, call