A silent stroke refers to a stroke that doesn't cause any noticeable symptoms. Most strokes are caused by a clot that blocks a blood vessel in the brain. The blockage prevents blood and oxygen from reaching that area, causing nearby brain cells to die.
Silent Doesn't Mean Harmless
While silent strokes often pass undetected, the damage they cause can be quite noticeable. Once you suffer from a silent stroke, your chances of suffering from more strokes in the future increase. The damage caused to the brain can result in significant cognitive decline or even death.
A silent stroke is most often caused by reduced blood flow in one of the smaller arteries that feed the brain. It can occur without noticeable symptoms if it affects a part of the brain that doesn't control major movements or vital functions.
A silent stroke differs from a transient ischemic attack (TIA). In TIA symptoms of stroke are exhibited which may last from a few minutes to 24 hours before resolving. A TIA is a risk factor for having a major stroke and subsequent silent strokes in the future.
Detecting a Silent Stroke
If you have a silent stroke, you probably won't know it unless you happen to have a brain scan and the damage shows up. You may have slight memory problems or a little difficulty getting around. A doctor may be able to see signs of silent strokes without testing.
During a silent stroke, an interruption in blood flow destroys areas of cells in a part of the brain that is "silent," meaning that it doesn't control any vital functions. Although the damage will show up on an MRI or CT scan, it's too small to produce any obvious symptoms.
Blood pressure also tends to increase when you're stressed and when blood pressure is consistently high, it can narrow or weaken blood vessels. This makes it easier for blood clots to form or for vessels to leak or burst, triggering a stroke.
Call 9-1-1 immediately if any of these signs of stroke appear: Numbness or weakness in the face, arm, or leg; Confusion or trouble speaking or understanding speech; Trouble seeing in one or both eyes; Trouble walking, dizziness, or problems with balance; severe headache with no known cause.
If a person has a brain scan and their doctor detects one or multiple silent strokes, they may prescribe medications. For instance, blood thinning medications can help to lower blood pressure, and cholesterol medications can help to lower low-density lipoprotein (LDL) cholesterol.
But some strokes don't cause any noticeable symptoms. These silent strokes still increase dementia risk. With both silent and apparent strokes, the risk of vascular dementia increases with the number of strokes that occur over time. One type of vascular dementia involving many strokes is called multi-infarct dementia.
The only way to tell the difference between a ministroke and a stroke is by having a doctor look at an image of your brain with either a CT scan or an MRI scan. If you've had an ischemic stroke, it's likely that it won't show up on a CT scan of your brain for 24 to 48 hours. An MRI scan usually shows a stroke sooner.
Drink a lot of water: You should drink at least five glasses of water per day, and this will reduce your risk of stroke by 53%, according to a recent study by Loma Linda University.
Detecting a Silent Stroke
If you have a silent stroke, you probably won't know it unless you happen to have a brain scan and the damage shows up. You may have slight memory problems or a little difficulty getting around. A doctor may be able to see signs of silent strokes without testing.
Weakness or numbness of the face, arm or leg, usually on one side of the body. Trouble speaking or understanding. Problems with vision, such as dimness or loss of vision in one or both eyes. Dizziness or problems with balance or coordination.
Warning signs of an ischemic stroke may be evident as early as seven days before an attack and require urgent treatment to prevent serious damage to the brain, according to a study of stroke patients published in the March 8, 2005 issue of Neurology, the scientific journal of the American Academy of Neurology.
AFib is a type of abnormal heartbeat that can lead to stroke-causing blood clots. For people with silent strokes, the statement recommends following stroke prevention guidelines(link opens in new window) already in place, such as eating a Mediterranean diet, reducing sodium in the diet and not smoking.
In addition to the classic stroke symptoms associated with the FAST acronym, around 7-65% of people undergoing a stroke will experience some form of a headache. People describe a stroke-related headache as a very severe headache that comes on within seconds or minutes.
The greater the anxiety level, the higher risk of having a stroke, according to research published in the American Heart Association journal Stroke from December 2013. The study is the first in which researchers linked anxiety and stroke independent of other factors such as depression.
If you have a brain CT scan or anMRI, the image will show white spots or lesions where your brain cells have stopped functioning. That's how doctors will know you've had a silent stroke. Other signs are so subtle that they're often mistaken for signs of aging, like: balance problems.
If a stroke is suspected, a CT scan is usually able to show whether you have had an ischaemic stroke or a haemorrhagic stroke. It's generally quicker than an MRI scan and can mean you're able to receive appropriate treatment sooner.
Yes, you can have a stroke and not know it. A stroke's effects can be undetectable if the stroke is small or if the tissue damaged does not serve a critical function. Evidence of the stroke would show on a CT scan or an MRI of the brain, but it might not produce symptoms.
You must stop driving for at least 1 month after a transient ischaemic attack ( TIA ) or mini-stroke. This includes amaurosis fugax or retinal artery fugax. You can restart only when your doctor tells you it is safe.
In fact, ischemic strokes unfold over a period of 10 hours. That means that with every second you wait for treatment, the brain damage gets worse. If a stroke is untreated for the full 10 hours, the brain ages up to 36 years! With every minute you wait, the brain loses two million brain cells.