Computed tomography (CT) scan. A CT scan uses X-rays to take pictures of the brain. A CT scan of the head is usually one of the first tests used for a stroke. A CT scan can show bleeding in the brain or damage to brain cells. The CT scan also can find other problems that can cause stroke symptoms.
A brain CT scan can show if there is bleeding in the brain or damage to the brain cells from a stroke. Magnetic resonance imaging (MRI) uses magnets and radio waves to create pictures of your brain. An MRI may be used instead of—or in addition to—a CT scan to diagnose a stroke.
Yes – like an MRI, a CT scan can detect old strokes. There may be changes in the volume of brain cells where the stroke took place. On a CT, this looks like white spots.
Weakness, numbness or paralysis in the face, arm or leg, typically on one side of the body. Slurred or garbled speech or difficulty understanding others. Blindness in one or both eyes or double vision. Vertigo or loss of balance or coordination.
You will likely have a head CT scan or brain MRI. A stroke may show changes on these tests, but TIAs will not.
There is no blood test that can diagnose a stroke. However, in the hospital, your doctor or nurse may do a series of blood tests to learn the cause of your stroke symptoms: Complete blood count (CBC).
Can an ECG detect stroke? Yes. ECG can detect a heart problem that might lead to a stroke or even uncover a past problem such as a previous heart attack.
Some people will experience symptoms such as headache, numbness or tingling several days before they have a serious stroke. One study found that 43% of stroke patients experienced mini-stroke symptoms up to a week before they had a major stroke.
However, it does involve many of the same signs and symptoms as a stroke. A person experiencing a TIA might feel sudden weakness or numbness on one side of the body, have slurred speech, have trouble seeing or talking, and feel confused. The person may experience a combination of these symptoms at the same time.
Brain scans and tests
You should have a brain scan soon after symptoms start, within an hour of arriving at hospital if possible. The scan can show whether the stroke is due to a clot or a bleed. There are two main types of scan used: A computed tomography or CT scan.
Missed Strokes
Fifty-five of these were missed at the academic hospital (20%). The remaining 48 were at the community hospital (26%, P=0.11).
Strokes may not be seen on a CT scan for several reasons. It can sometimes take several hours for the brain to appear abnormal after the onset of stroke. The affected region may also be a part of the brain that CT scans do not image well, such as the cerebellum or the brainstem.
Some of the most common stroke mimics are seizures, migraine, fainting, serious infections and functional neurological disorder (FND). Once the person is diagnosed, they can have treatment or support to manage their symptoms.
One of the most common stroke mimics is a seizure, which researchers believe account for as many as 20% of all stroke mimics. Other common stroke mimics include migraines, syncope, sepsis, brain tumor and metabolic derangement (low sodium or low blood sugar).
Any irregularities or causes for concern show up in a CT scan approximately six to eight hours after the onset of the first signs of a stroke. During a CT scan, the patient may be intravenously injected with dyes, which will highlight any abnormal areas in the scan, giving doctors a clearer view of the head.
Pre-strokes or mini strokes are the common terms used to describe a transient ischemic attack (TIA). Unlike a full blown stroke, a TIA only lasts a few minutes and does not cause permanent damage. Nevertheless it is a warning sign that a possible stroke may be coming in the future.
These brief episodes are transient ischemic attacks (TIA), sometimes called “mini-strokes.” They still should be taken seriously, because they tend to be signs of underlying serious conditions that can lead to a full stroke, even possibly in the few days following a TIA event if not evaluated and treated for a TIA.
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.
Undiagnosed stroke or misdiagnosed stroke means delayed treatment or no treatment at all. This allows brain cell death to continue, and can quickly escalate to preventable permanent brain injury or death.
A “mini-stroke" may not cause permanent brain damage, but it's a warning sign that you could be at risk for a debilitating—or deadly—stroke. Approximately one in three American adults has experienced a symptom consistent with a “mini-stroke,” sometimes called a transient ischemic attack (TIA).