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Stroke

Description

An in-depth report on the causes, diagnosis, treatment, and prevention of stroke.

Alternative Names

Atrial Fibrillation; Transient Ischemic Attacks

Symptoms

People at risk and partners or caretakers of people at risk for stroke should be aware of the general symptoms, and 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 stroke.

Symptoms of TIAs and Early Ischemic Stroke

The symptoms of a transient ischemic attacks (TIAs) and early ischemic stroke are similar. In the case of a TIA, however, the symptoms should resolve within 24 hours. Symptoms depend on where the injury in the brain occurs. The origin of the stroke is usually either the carotid or basilar arteries.

Atherosclerosis of internal carotid artery
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, pieces of plaque in the internal carotid artery can 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 stem off of the aorta (the primary artery leading from the heart) and lead up through the neck around the windpipe and on into the brain. When TIAs or stroke occur from blockage in the carotid artery, which they often do, symptoms may occur in either the retina of the eye or the cerebral hemisphere (the large top part of the brain).

They include the following:

  • When oxygen to the eye is reduced, people describe the visual effect as a shade being pulled down. People may develop poor night vision. About 35% of TIAs are associated with temporary lost vision in one eye. Although such events are risk factors for future stroke, they pose a lower risk for a stroke and its complications than more widespread TIA symptoms.
  • When the cerebral hemisphere is affected, a person can experience problems with speech and partial and temporary paralysis, drooping eyelid, tingling, and numbness, usually on one side of the body. The stroke victim may be unable to express thoughts verbally or to understand spoken words. If the stroke injuries are on the right side of the brain, the symptoms will develop on the left side of the body and vice versa.
  • Uncommonly, patients may experience seizures.

Symptoms From Blockage in the Basilar Artery. The other major site of trouble, 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 occur here, both hemispheres of the brain may be affected so that symptoms occur on both sides of the body. The following symptoms may develop:

  • Temporarily dim, gray, blurry, or lost vision.
  • Tingling or numbness in the mouth, cheeks, or gums.
  • Headache, usually in the back of the head.
  • Dizziness.
  • Nausea and vomiting.
  • Difficulty swallowing.
  • Weakness in the arms and legs, sometimes causing a sudden fall.

Such strokes usually occur in the brain stem, which can have profound affects on breathing, blood pressure, heart rate and other vital functions, but does not affect thinking or language.

Speed of Symptom Onset. The speed of symptom onset of a major ischemic stroke may indicate its source:

  • If the stroke is caused by a large embolus (a clot that has traveled to an artery in the brain), the onset is sudden. Headache and seizures can occur within seconds of the blockage.
  • When thrombosis (a blood clot that has formed within the brain) causes the stroke, the onset usually occurs more gradually, over minutes to hours. On rare occasions it progresses over days to weeks.
Click the icon to see an image of carotid dissection.
Click the icon to see an image of stroke.
Click the icon to see an image of stroke.

Symptoms of Hemorrhagic Stroke

Cerebral Hemorrhage Symptoms. Symptoms of a cerebral, or parenchymal, hemorrhage typically begin very suddenly and evolve over several hours and include:

  • Headache.
  • Nausea and vomiting.
  • Altered mental states.
  • Seizures.

Subarachnoid Hemorrhage. 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:

  • Abrupt headaches.
  • Nausea and vomiting.
  • Sensitivity to light.
  • Various neurologic abnormalities. Seizures, for example, occur in about 8% of patients.

When the aneurysm ruptures, the stroke victim may experience the following:

  • A terrible headache.
  • Neck stiffness.
  • Vomiting.
  • Altered states of consciousness.
  • The eyes may become fixed in one direction or lose vision.
  • Stupor, rigidity, and coma.
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