What Is A Stroke
A stroke happens when the blood supply to the brain is interrupted. In about 80% of cases, this happens because of a blood clot or blocked artery. Strokes can also happen if the blood vessel itself is damaged. Without a good blood supply, the brain cells dont get the oxygen they need to function. If the supply is interrupted for long enough, the brain cells will die.
The effects of a stroke will depend on how long the interruption is. A mini-stroke or transient ischemic attack happens when the blood vessel is just temporarily blocked. The symptoms can go away within minutes as the blood supply returns and there might not be much permanent damage to the brain cells. A TIA can be a sign that a more serious stroke is on the way, so it is important to take them seriously and to seek help, even if the symptoms go away by themselves. About 4 in 10 people who have a TIA will go on to have a stroke.
A major stroke can cause very serious symptoms, including long term problems because of the damage to the brain cells. A stroke could even be fatal if you arent able to get help quickly. The faster you seek help, the better the chances of a good recovery.
Too Few With Stroke Of The Eye Are Treated To Reduce Future Stroke
- American Heart Association
- Only one-third of 5,600 patients with retinal infarction, or stroke in the eye, underwent basic stroke work-up, and fewer than one in 10 were seen by a neurologist. One in 100 of the retinal infarction patients studied experienced another stroke within 90 days of their retinal infarction.
Too few patients with retinal infarction, or loss of blood flow in the eye, are evaluated for stroke risk or seen by a neurologist, putting them at increased risk for another stroke, according to preliminary research presented at the American Stroke Association’s International Stroke Conference 2018, a world premier meeting dedicated to the science and treatment of cerebrovascular disease for researchers and clinicians.
The study showed that 1 in 100 patients in the study experienced an ischemic stroke within 90 days of a retinal infarction. In addition, among 5,688 individuals with retinal infarction, only one-third underwent basic testing, and fewer than one in 10 were seen by a neurologist. Within 90 days of symptoms, only 34 percent received cervical carotid imaging tests; 28.6 percent received heart-rhythm testing; 23.3 percent received echocardiography; and 8.4 percent were evaluated by a neurologist.
What Are The Signs Of An Eye Stroke
You may not realize that you could be at risk for an eye stroke. Look for these three most common causes of an eye stroke, to prevent a retinal artery occlusion:
Eye floaters are spots on the eye that move through your field of vision. They can appear like a string, drifting spot, cobweb, or discoloration. They may also dart or move along with the movement of your eyes. If you notice these types of changes in your eyesight you should call an ophthalmologist. If your eye floaters suddenly appear or increase rapidly, you need to use natural remedies immediately. You may be able to reduce the appearance of eye floaters by performing gentle massage around the area at the temples, focusing on vision changes, performing eye exercises, getting plenty of sleep, using high-quality sunglasses, and maintaining a healthy eye diet.
You may be wondering, Do eye floaters go away? If you notice that one, or more areas include eye floaters, you need to contact an eye specialist. Eye floaters initially appear as a type of discoloration that floats around in your vision. When floaters happen, it is due to leakage from the tiny capillaries in your eyes, and other fluids that can clump, and clot in your eye.
While many eye strokes occur without any forewarning, pain is one of the most common signs of retinal artery occlusion . Pressure or pain in your eye may be a signal that you are at risk from an eye stroke.
Who Is At Risk
Anyone can have a stroke, but some of us are more likely to have one than others. It is important to know if you are at higher risk so that you can ensure youre aware of the warning signs. You might not be aware if you have a weakened blood vessel that could burst, but other risk factors for stroke can be screened for and often changed.
Most strokes happen when there is a blood clot or blockage in the blood vessels supplying the brain. Luckily, many of the factors that increase the risk of these kinds of blockages are under our control so you can take steps to reduce your risk.
You are more likely to have a stroke if:
- You are overweight
- Your blood pressure is high
- You have certain conditions such as diabetes or atrial fibrillation
Eating a balanced diet, getting regular exercise and enjoying a healthy lifestyle can help to lower many of these risks.
If you want to find out your stroke risk then you should talk to your doctor or arrange health screening. Getting your blood pressure, cholesterol levels and other factors checked can tell you if you are more likely to develop a blood clot or to have a blocked artery that could cause a stroke.
What Causes An Eye Stroke
An eye stroke is caused by obstructed blood flow that damages the retina. This is usually due to either narrowing of the blood vessels or a blood clot.
Its not always clear why eye stroke occurs, but certain health conditions, such as high blood pressure and diabetes, can increase your risk.
Certain medical conditions also increase your risk of eye stroke. These include:
- problems that affect blood flow, such as high blood pressure and high cholesterol
- other cardiovascular diseases
- narrowing of the carotid artery or neck artery
- rare blood disorders
Your doctor will start by dilating your eyes for a physical examination. They will use an ophthalmoscope, also called a fundoscope, to take a detailed look inside your eye.
Other diagnostic testing may include:
- Optical coherence tomography , an imaging test that can detect swelling of the retina.
- Fluorescein angiography. For this test, a dye is injected into your arm to help highlight blood vessels in your eye.
Your treatment will depend on how much damage was done by the stroke. Another consideration is your overall health. Some possible therapies include:
The sooner you start treatment, the better your chances of saving part or all of your vision. Any other conditions that cause blood clots will also have to be treated.
What Is The Cause
The most common type of optic nerve stroke may be caused by narrowed or blocked arteries or by a fall in blood pressure in the blood vessels that supply the optic nerve. You are at higher risk for this type of optic nerve stroke if you have:
- A small optic nerve
- Rheumatoid arthritis, lupus, or other problems that affect your immune system
Medicines to treat erectile dysfunction may increase the risk for optic nerve strokes.
Although not as common, a more serious cause of an optic nerve stroke is giant cell arteritis . GCA is a disease in which the arteries in the temples get swollen, narrowed, and sometimes completely blocked. GCA can affect any of the large arteries in your body and can be life threatening. An optic nerve stroke caused by GCA is most common in people over the age of 55.
Am I Having An Eye Stroke
Eye stroke symptoms can come on suddenly, or develop gradually over the course of a few hours or even days.
Prompt treatment is essential in order to prevent permanent vision loss.
- Grey spots or floaters in your visual field
- Eye pressure
- Blurry vision that gets progressively worse
- Gradual or sudden total vision loss
The distinguishing symptom of an eye stroke is that it typically occurs in only one eye.
What Is Eye Stroke Or Central Retinal Artery Occlusion
A blockage in a small artery that supplies blood to the retina is referred to as a retinal artery occlusion. When the main artery to the retina is blocked, it is called a central retinal artery occlusion. Just like a stroke, a CRAO is typically caused by an embolus, a piece of a blood clot that breaks off of a larger plaque in a large blood vessel or the heart. When this happens, the retina is deprived of its oxygen supply, also just like a stroke. The retinal nerve cells that allow you to see can quickly die unless blood flow is restored. Retinal artery occlusions are more common in people with compromised blood vessels from conditions like high blood pressure, diabetes, atherosclerosis, and high cholesterol, and blood disorders that affect clotting.
Testing & Timing Make The Difference
A brain scan is the most common way to diagnose a stroke sothat doctors can proceed with proper treatment. These tests include MRI scans orCT scans to detect changes in the brain.
MRI scans are superior at detecting strokes, but are moreexpensive. This makes CT scans more popular, and they are ordered for about 40%of emergency room admissions for dizziness.
However, CT scans miss more than of strokes in the brain stem and cerebellum.
In fact, about ofall hospital admissions for vertigo are individuals experiencing cerebellarstrokes.
This could imply that doctors should opt for an MRI scan over a CT scan when vertigo is present. Unfortunately, even if this precaution is taken, it does not completely solve the problem.
MRI scans cannot detect a stroke in the brain stem or cerebellum until 48 hours after the symptoms first start. This puts doctors in a tricky position.
What kinds of tests should be conducted when vertigo is present, and when?
What Is A Brain Stroke
The human brain is a complex organ which depends on continuous blood supply. A disruption in blood-flow can cut vital oxygen and glucose to the brain and lead to brain death within a couple of minutes.
Stroke is a medical condition where the blood supply to a portion of the brain decreases or gets severely interrupted. It is a medical emergency wherein the cells of the brain start dying within minutes of being deprived of nutrients and oxygen due to the restriction of blood supply. The inability of brain cells to regenerate results in permanent damage and irreversible consequences.
What Are The Symptoms Of Brain Stroke
Compared to men, women are more prone to get a brain stroke. Some of the common symptoms in men and women include:
- Blurred, blackened or double vision in one or both eyes
- Difficulty in speaking, slurring of speech and confusion
- Difficulty in walking and balancing
- Sudden severe headache with vomiting or unconsciousness
- Sudden, one-sided paralysis or numbness of an arm or leg and face, drooping of lips to one side on smiling
- Sudden headache
Benign Vertigo Vs Stroke: How To Differentiate & Why Proper Testing Matters
Understanding the difference between vertigo vs stroke can help healthcare providers save tens of thousands of lives each year and a new testing technique can help.
Youre about to learn the difference between benign vertigoand stroke, and how each condition is tested and diagnosed.
Understanding these differences has major implications for healthcareproviders and patients alike.
Coma After Stroke: What It Means & How To Maximize Chances Of Recovery
When a loved one falls into a coma after stroke, it can be a distressing time.
Its impossible to know if or when someone will wake up from a coma. To help cope with this uncertainty, its crucial to do your research and also find emotional support for yourself.
Youre about to learn some statistics about coma after stroke, which can hopefully paint a picture of what to expect. Every stroke is different, so its impossible to know exactly what will happen. Still, there are patterns worth noting.
Heres everything we know about coma after stroke:
What Is An Eye Stroke And How Is It Linked To Sleep Apnea
Sleep apnea is linked to many dangers to your vision such as diabetic retinopathy , but theres one thats less often discussed because it is very rare: the eye stroke. However, this is a very serious threat to your vision, with rapid deterioration of vision and little ability to reverse the effects. However, treating sleep apnea could reduce your risk of this serious problem.
Symptoms Of Eye Stroke
Each year hundreds of thousands of people experience a new or a recurrent stroke in the eye. You must pay serious attention to an eye stroke and be ready to identify them at the very immediate time as the symptoms come without any warning. There are some symptoms; simple guides that can help you identify eye stroke and how to deal with them.
Note that when symptoms of stroke in your eye begin to manifest, you need to act immediately so they can lead to good treatment.
Here are some basic symptoms of eye stroke that have been defined by specialized people in the field:
- A sudden loss of vision or eye vision difficulties is the major symptom of stroke in your eye. Blurred or blackened vision in one or both eyes, double seeing.
- Sudden dizziness while walking, balance issues or loss of coordination are also symptoms of eye stroke or stroke in your eye.
- Sudden , along with dizziness or , can lead to the fact that you might deal with an eye stroke.
- Difficulties with talking and understanding.
- Numbness or paralysis of legs, arms or face. You may experience a weakness or paralysis development in your face, arm or leg, most commonly on one side of your body.
What Is Ocular Migraine
According to the American Migraine Foundation, about 25 to 30 percent of people with migraine experience aura, and less than 20 percent have it with every attack.
Migraine with aura involves visual distortions that might remind you of looking through a . It typically affects both eyes. Symptoms can include:
- sparkling or shimmering spots
- speech changes
Certain things, like bright or flashing light, can trigger migraine with aura.
An attack usually starts with a small spot that slowly expands. It might dart away when you try to focus on it. You may still see it when you close your eyes.
These can be disturbing, but theyre temporary and not usually harmful.
The attack typically lasts 20 to 30 minutes, after which vision returns to normal.
For some people, this aura is a warning sign that migraine pain and other symptoms will soon hit. Others have aura and pain at the same time.
An attack can also happen by itself, with no pain. This is called acephalgic migraine or silent migraine.
Migraine with aura isnt the same as retinal migraine, which is more serious. Retinal migraine happens in only one eye and can cause temporary blindness or in some cases, irreversible damage.
Having migraine with aura doesnt mean youre having a or that stroke is about to happen. If you have migraine with aura, though, you may be at a higher risk of stroke.
A prospective, longitudinal published in 2016 compared people with migraine to those without migraine. The mean age of participants was 59.
How To Spot The Early Warning Signs
You might have heard the FAST acronym before. Its an easy way to remember the most common warning signs of a stroke and the importance of acting quickly:
- Face drooping
- Arm weakness or numbness
- Speech problems such as slurring or difficulty repeating a sentence
- Time to call an ambulance
However, there are some other possible symptoms that you should watch out for too:
- A sudden, severe headache
- Sudden dizziness, loss of balance or coordination
- Loss of vision or changes to your vision in one or both eyes, which usually happens suddenly
- Feeling confused or having trouble understanding things that are usually easy for you
- Numbness or weakness on one side of the body
The signs of a stroke often appear suddenly, but that doesnt mean that you wont have time to act. 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.
If you take note of these symptoms and seek help even if they go away, then your chances of a good recovery are much better. Dont ignore the early warning signs. You arent overreacting if theres a change youve had a TIA. Get help right away as a more serious stroke could be hours or days away.
Therapies Should Encourage Neuroplasticity
In the new study, the researchers worked with 15 participants who were receiving care at Strong Memorial and Rochester General Hospital for vision damage resulting from a stroke.
The participants agreed to take tests assessing their eyesight. They also had MRI scans to monitor their brain activity and an additional test that looked at the state of the retinal ganglion cells.
First, the investigators found that the health and survival of the retinal ganglion cells were highly dependent on activity in the associated primary visual area. Thus, the retinal cells connected to inactive brain areas would atrophy.
At the same time, however, the team surprisingly noted that some retinal cells in the eyes of people who had experienced vision impairment were still healthy and functional, even though the person had lost sight in that part of the eye.
This finding, the researchers explain, indicates that those healthy eye cells remained connected to fully active brain cells in the visual cortex. However, the neurons failed to correctly interpret the visual information that they received from the corresponding retinal ganglion cells, so the stimuli did not translate into sight.
These findings suggest a treatment protocol that involves a visual field test and an eye exam to identify discordance between the visual deficit and retinal ganglion cell degeneration, notes the studys first author Dr. Colleen Schneider.
Brain Injuries Increase Risk Of Stroke
Traumatic Brain Injury Could Raise Stroke Risk Tenfold, Study Says
July 28, 2011 — People who have had a traumatic injury face a tenfold increase in the risk of having a stroke within three months, according to a new study.
Traumatic brain injury occurs when a blow or jolt to the head causes changes in a personâs normal brain function. It can result from injuries such as falls, vehicle accidents, and violence.
Although previous research has shown that traumatic brain injury can be associated with the future development of epilepsy, Alzheimerâs disease, and psychiatric conditions, this the first study to link it to the future risk of stroke. The study appears in the July 28 online issue of Stroke: Journal of the American Heart Association.
How Is An Eye Stroke Linked To Sleep Apnea
As with many conditions that are strongly linked to sleep apnea, we are not entirely certain about how the two conditions are linked. However, in a story about a person who suffered from this condition, the doctor offered a potential explanation.
When the body is starved for oxygen, the lack of oxygen can cause the nerves to swell, which could potentially lead to blockage of small arteries in the eye, as well as damage to the nerves themselves. The result is relatively rapid vision loss, which cannot easily be restored.
Risk Factors For Stroke Include:
- High blood pressure
- Personal or family history of stroke or TIA
- Brain aneurysm or arteriovenous malformation
Diseases of the heart, diabetes, hypertension, all when controlled can reduce the risk of dementia onset. Quitting smoking can of course reduce the chance of stopping blood flow to areas of the brain.
What Causes Coma After Stroke
To understand why someone has fallen into coma after stroke, its important to know what causes a stroke to begin with.
A stroke occurs when the supply of blood to the brain is compromised. This can result from a clogged artery in the brain or uncontrolled bleeding from an artery in the brain .
When a stroke occurs, it can increase intracranial pressure, especially during a hemorrhagic stroke where blood begins to fill the areas between the brain and the skull.Swelling in the brain, or cerebral edema, is thought to increase the risk of coma after stroke. Sometimes surgery is required to fix the stroke, and it is possible for a coma to occur after the surgery is done.
Quick summary: Coma is more likely to occur if the stroke creates excessive intracranial pressure and/or requires surgery.
Comparing The Symptoms Of Stroke Vs Vertigo
Before we discuss how a stroke is diagnosed when vertigo is present, lets briefly cover the cause of a stroke.
A stroke occurs when the supply of blood in the brain is compromised by a clogged or burst artery. Its a medical emergency because, until the stroke is treated, brain damage continues to occur.
The hallmark symptoms of a stroke include facial drooping,arm weakness, and slurred speech. Atypical symptoms can include headache,nausea, numbness, and last but not least vertigo.
is a sensation of spinning and dizziness that is often accompanied by nausea.It can result from problems in the inner ear ,brain, or sensory nerve pathways.
While the symptoms of vertigo sometimes overlap with stroke, they are atypical symptoms. Doctors are often not as quick to catch the atypical signs of a stroke compared to the hallmark symptoms of a stroke.
This can lead to misdiagnoses, which unfortunately lead to increased disability or even death, as brain damage increases the longer a stroke goes untreated.
Ordering the right test at the right time can make a serious difference.
Eye Stroke: Symptoms Causes And More
What is an eye stroke?
Strokes dont only happen in the brain. They can also happen in the eyes. This type of stroke is called retinal artery occlusion.
Blood vessels carry vital nutrients and oxygen to every part of your body. When those vessels narrow or get blocked by a blood clot, the blood supply is cut off. The affected area can suffer serious damage, known as a stroke.
In the case of an eye stroke, the blockage affects the retina. The retina is the thin film that lines the inner surface of the back of your eye. It sends light signals to your brain so you can understand what your eyes see.
When the retinal veins are blocked, they leak fluids into the retina. This causes swelling, which prevents oxygen from circulating and impacts your ability to see.
An obstruction in your main retinal vein is called a central retinal vein occlusion . When it happens in one of your smaller branch veins, its called a branch retinal vein occlusion .
Continue reading to learn the symptoms, causes, and treatment for eye stroke.
Eye Stroke: Similarities To A Stroke And Risks
September 26, 2019, 8:00 PM
The eyes may be the window to the soul, but theyre also home to our most dominant sense and can be harbingers of overall health and wellness. To keep them working well, theyre fed by a vast network of blood vessels that bring oxygen to the delicate tissues of the eye. However, occasionally, the flow of oxygen-rich blood to the eyes can be blocked or interrupted. When this happens, it results in a condition called eye stroke.
One of two areas of the eye are most commonly involved in eye stroke:
The retina, which is a film at the back of the eye.
The optic nerve, which transmits visual information from the retina to the brain for interpretation.
Barbara Horn, a doctor of optometry and president of the American Optometric Association says that the term eye stroke is used to describe several different conditions that lead to vision loss because of lack of sufficient blood flow to the eye. An eye stroke can cause sudden loss of vision.
Though the causes of these various types of eye stroke may be different, the end result is the same: vision loss that can become permanent if its not appropriately addressed as soon as possible.
The most common of these conditions include:
Retinal arterial occlusion.RAO is less common and can be more serious, as it may be a greater harbinger for a stroke in the brain than an RVO. RAO results from a direct blockage of flow of blood entering the eye, Browne explains.
Other symptoms may include: