Have you ever had a mini-stroke? This is called a TIA (Transient Ischemic Attack)!

Have you ever heard of a Transient Ischemic Attack ( TIA )? It may sound a bit strange to you. Simply put, it's like a temporary stroke . That is, the blood flow to a part of our brain is temporarily restricted and then returns to normal. This is something we should really be concerned about, because it can be a precursor to a major stroke. So, today we're going to talk about TIA in a way that you can understand.

What exactly is a TIA?

A TIA, as I mentioned earlier, is a temporary interruption of blood flow to a part of your brain. It's like a water pipe that gets blocked for a while and then opens again. When blood flow is cut off, brain cells don't get oxygen and nutrients. Then those cells stop working for a while, and sometimes they start to get damaged. This is what we call `(Ischemia)`.

This is often called a TIA. It is very similar to an ``ischemic stroke'', which is a stroke caused by a blood clot. The symptoms are the same for both. But the main difference is that the symptoms of a TIA disappear completely within 24 hours (often within a few minutes).

The most important thing: A TIA is a medical emergency, just like a stroke! Because we can’t tell for sure whether it’s a TIA or a stroke when the symptoms start. Therefore, if you or someone you know experiences symptoms of a stroke (for example, loss of consciousness, inability to speak, facial drooping, vision changes), you should call 1990 (Sri Lanka’s emergency ambulance service) immediately. Even if your symptoms subside a little, don’t wait and think, “Oh, this is okay.” A TIA can be a warning sign before a major stroke happens!

TIA or “mini stroke” – which is the correct name?

Many people also call TIAs “mini-strokes.” But that’s not exactly the right name. A TIA isn’t always “mini,” or small. Sometimes it can affect a larger area of ​​the brain. The important thing is that a real stroke can occur within minutes, hours, or days after a TIA.

There are two other key differences between a stroke and a TIA:

1. A TIA usually goes away on its own. That means the symptoms go away. But a stroke doesn't. It needs to be treated.

2. If you have a stroke, the signs of it can be seen on an MRI scan. Even if your symptoms go away, the damage to your brain is still there. In a TIA, there usually isn't much difference on an MRI.

What are the symptoms of a TIA?

The symptoms of a TIA are very similar to those of a stroke. One or more of these may occur at the same time:

• Loss of strength or paralysis on one side of the body (Hemiplegia): Imagine suddenly not being able to lift an arm or leg, or feeling like you're leaning to one side when walking.
• Difficulty or inability to speak (Aphasia): Difficulty forming words, unable to say what you want to say, or unable to understand what others are saying.
• Stuttering or slurred speech (Dysarthria): When speaking, words are not clear, as if the tongue is stuck.
• Loss of control or drooping of one side of the face: When looking in the mirror, the corner of the mouth on one side turns down and it feels like it is difficult to close the eye.
• Sudden loss of sensation in one or more senses (sight, hearing, smell, taste, touch ): Suddenly losing sight, hearing, smell, or taste.
• Blurred vision or double vision (Diplopia): Seeing two things at once, or having blurred vision.
• Loss of balance or difficulty in moving the body (Ataxia): It feels like you are swaying when walking, and it is difficult to control your limbs.
• Vertigo: A feeling of dizziness or spinning in the head .
• Nausea and vomiting : Feeling like your stomach is turning over, and you may feel like vomiting.
• Neck stiffness: It is difficult to turn the neck, it feels stiff.
• Emotional instability and personality changes: Sudden anger, crying spells, or changes in behavior.
• Confusion or agitation: Can't figure out what's happening, feels agitated.
• Amnesia: You can't remember what happened, and you can't remember what you did a short time ago.
• Headache (usually sudden and severe): A sudden, severe headache.
• Fainting or fainting: Sudden loss of consciousness.

If you have any of these symptoms , don't ignore them. Seek medical advice immediately.

What causes a TIA?

The causes of both TIA and `(Ischemic stroke)` are largely similar. These are:

• Thrombosis: A blood clot forms inside a blood vessel in the brain and blocks it.
• A part of a blood clot that has formed elsewhere in the body breaks off and travels to the brain (Thromboembolism): Imagine a blood clot that has formed in the heart or in the large blood vessels in the neck (Carotid arteries), breaks off, travels with the blood, and gets stuck in a small blood vessel in the brain.
• Lacunar stroke: A blockage of very small blood vessels in the brain.
• Cryptogenic TIA: Cryptogenic means “hidden cause.” This means that some TIAs have no obvious cause.

What are the risk factors for this condition?

There are many factors that can cause or increase the likelihood of a TIA. We call these risk factors.

• High blood pressure (Hypertension): This is the main and strongest risk factor for developing a TIA. That's why we always say to keep your blood pressure under control.
• Type 2 diabetes: People with diabetes are also at increased risk of developing TIA.
• Tobacco use (especially smoking or vaping): Smoking cigarettes and vaping have a big impact on this.
• Atrial Fibrillation (Afib): This is an abnormal heart rhythm (Arrhythmia). In this, blood may not flow properly in one chamber of the heart and may be in a stagnant state. This makes it easier for blood clots to form. These blood clots can travel to the brain and become stuck.
• Having had a previous stroke or TIA: If you have had a previous stroke or TIA, you are more likely to have another TIA.

Other risk factors:

• Heart disease and previous heart attack (especially recent): People with heart disease and those who have had a heart attack are at higher risk.
• High cholesterol (Hyperlipidemia): Due to the increase in the level of bad cholesterol (LDL cholesterol) in the blood, these can be deposited inside the blood vessels and narrow the blood vessels. This is called ``Atherosclerosis``.
• Overweight or obesity: Obese people are also at higher risk.
• Drug use (including recreational drugs) and excessive alcohol consumption without medical advice.
• Age: As we age, blood vessels become less flexible for various reasons. This can lead to atherosclerosis, narrowing of the blood vessels, and a TIA.

What are the possible complications of a TIA?

The main reason a TIA is a medical emergency is because it is a warning sign that a stroke is coming . About 20% of people who have a TIA will have a stroke within 90 days. And half of those strokes occur within the first two days of the TIA. That's why it's so important to get treatment right away.

How is a TIA diagnosed? (Diagnosis)

A doctor diagnoses a TIA by combining several methods.

• Medical history: We will ask you questions about your health conditions, past illnesses, and current symptoms.
• Physical and neurological examination: This can help the doctor learn more about your symptoms, especially if you still have symptoms at the time of the examination.
• Imaging scans:
• A CT scan can be done in a few minutes. It can quickly determine if there is bleeding in the brain. If there is, treatment can be started immediately.
• An MRI scan can tell you for sure whether you had a stroke or a TIA. This is because even if your symptoms have completely disappeared, if there is damage to the brain, it will show up on the MRI. If it does, it is a stroke. A TIA usually does not show that much damage.

Depending on your symptoms and any other health problems your doctor suspects, other tests may be ordered. Your doctor will explain what these tests are and why they are being done.

How is a TIA treated?

A TIA is, by definition, temporary. But it also means that a stroke – which is not temporary, but serious – can occur. That means that treating the condition that caused the TIA can prevent a stroke.

Doctors usually recommend early and aggressive treatment for these conditions. This is because a stroke is a much more serious, life-threatening condition. Strokes are also difficult to treat. Even with treatment, strokes can cause permanent damage or even death.

The main treatments to prevent a stroke after a TIA are:

• Medications
• Catheter-based procedures
• Surgery

Medications to prevent stroke after a TIA

There are many medications that can help treat conditions that cause or contribute to a TIA and prevent future TIAs or strokes.

• Aspirin: This is the most commonly prescribed medication by doctors. It helps prevent strokes by reducing the risk of blood clots. Clopidogrel (Plavix®), Ticagrelor (Brilinta®), and Aggrenox (a combination of aspirin and dipyridamole) are also used for this purpose.
• Blood pressure medications: These reduce the pressure inside the blood vessels. Examples include `(Calcium channel blockers)`, `(ACE inhibitors)`, `(Angiotensin II receptor blockers – ARBs)`, `(Diuretics)` (medicines that make you pass more urine).
• Types of statins:These are cholesterol-lowering drugs. They mainly reduce the level of bad cholesterol (LDL cholesterol) in the blood. This LDL cholesterol is what deposits in the blood vessels, narrowing them and causing atherosclerosis. Atorvastatin (Lipitor®) and Rosuvastatin (Crestor®) are well-known drugs in this class.
• Blood thinners / Anticoagulants: These medications make it harder for the blood to clot. This reduces the risk of a blood clot forming and getting stuck in a blood vessel in the brain. Examples include `(Warfarin – Coumadin®)`, `(Apixaban – Eliquis®)`, `(Rivaroxaban – Xarelto®)` or `(Dabigatran – Pradaxa®)`. These medications may be prescribed if you have `(Atrial Fibrillation)` (an abnormal heart rhythm) or if you have blood clots in your heart.

Catheter-based procedures

Endovascular procedures refer to any treatment that uses thin, tube-like instruments that are inserted into a blood vessel through a very small incision in the skin. Endovascular means “within a blood vessel.” These procedures treat problems within the blood vessel itself, without the need for major surgery.

These are usually done on your ``Carotid arteries''. That is, the main blood vessels that carry blood from the heart to the brain. Narrowing of these ``Carotid arteries'' (stenosis) can cause a TIA or stroke.

Here are some endovascular procedures that can help prevent stroke after a TIA:

• Endovascular thrombectomy: This is a procedure that removes the blood clot. This opens the blood vessel and restores blood flow to the brain.
• Stenting: This involves placing a stent, a mesh-like device, inside a blood vessel. The stent helps keep the narrowed part of the blood vessel open, allowing blood to flow more easily.
• Angioplasty: This involves a catheter (tube) with a balloon attached to it. This balloon can be inflated to widen the narrowed blood vessel.

Endarterectomy

In cases where catheter-based procedures are not possible, surgery can be done to widen the blood vessels. This can help prevent another TIA or stroke. An example is a surgery called a carotid endarterectomy. This involves opening a major blood vessel in the neck (the carotid artery), removing plaque, and increasing blood flow.

Treatment for other conditions that may contribute to a TIA

Other treatments may also be considered depending on your other medical conditions. For example, your heart or cerebrovascular (brain blood vessel) specialist team may determine that your TIA or stroke was caused by a condition called a patent foramen ovale (PFO). A PFO is a hole in the wall that separates the two lower chambers of the heart. This can allow blood clots to travel to the brain. Your doctor may recommend closing the hole to reduce the risk of a stroke.

Can a TIA be prevented?

Sometimes it can, but not always. Most TIAs are caused by preventable causes. But sometimes TIAs can also occur for unforeseeable, unexpected reasons.

There are many things you can do to reduce your risk of having an ischemic stroke, which is a stroke caused by a blood clot. While this may not prevent a stroke entirely, it can reduce your risk. Things you can do:

• See your primary care provider at least once a year for a complete checkup. This can help identify problems that may be present without symptoms, such as high blood pressure and diabetes.
• Maintain a healthy weight that suits you.
• Be careful about what you eat and drink (your family doctor will advise you on this).
• If you use tobacco products, stop using them (or don't start using them in the first place).
• If you use alcohol, limit it. Do not use other drugs without medical advice.
• Take the medicine prescribed by the doctor exactly as directed.
• Keep your chronic diseases (e.g. high blood pressure, diabetes, high cholesterol) under control.

What to expect if you have a TIA?

A TIA is like a temporary stroke. If you experience these symptoms while you are doing something, you may find it difficult to relax and the symptoms may lessen or go away. However, the symptoms may return quickly when you resume what you were doing.

Since the symptoms of both a TIA and a stroke are similar, you should always call 911 immediately. There is no way to tell if it is a stroke or a TIA at the time of symptoms.

How long can a TIA last?

The length of time a TIA lasts can vary. By definition, a TIA lasts less than 24 hours. However, it is rare for a TIA to last that long. Most TIAs last only a few minutes.

What is the outlook for a TIA?

The outlook for a TIA depends largely on what caused it and what you do about it. Without treatment, the risk of having a stroke within the next 90 days – especially within the first two days after the TIA – is very high.

The outlook is best if you seek emergency medical attention right away . Doctors can confirm whether you had a TIA or a stroke, and find out what caused or contributed to your TIA. That way, they can decide how to treat the underlying problem, and what you can do to prevent further problems.

How should I take care of myself after a TIA?

After you receive treatment, it is very important to follow your doctor's instructions. The more closely you follow those instructions, the more likely you are to avoid having another TIA or stroke. Since TIAs can occur for many different reasons, the way you need to take care of yourself may also change.

In general, the same things you can do to prevent TIAs or reduce your risk of having them are the same things you should do after a TIA. Your doctor will give you specific instructions on what you can and should do.

When should I see the doctor? / When should I go to the emergency room?

After receiving emergency treatment for a TIA, you should see a doctor for follow-up care. Your doctor will schedule follow-up visits as needed. They will also help you monitor your symptoms and see how well your treatment is working.

If you have had a TIA before, and those symptoms recur, you should immediately call 1990 and go to the nearest emergency room.

A person who has recently had a TIA may have other conditions. You should seek emergency medical attention if you experience any of the following symptoms:

• Blood clots in the veins of the legs (Deep Vein Thrombosis – DVT) (swelling, redness, pain in the legs)
• Pulmonary Embolism (PE) (sudden chest pain, difficulty breathing)
• Heart attack (severe chest pain, tightness, pain radiating down the left arm)

What questions should I ask the doctor?

• Did I have a TIA or a stroke?
• What are the underlying causes/factors that caused or contributed to my TIA?
• What changes can I make or want to make to prevent another TIA or stroke?
• What treatments are available to prevent another TIA or stroke?
• What side effects should I be aware of that may occur from medications or treatments?
• What other symptoms should I go to the emergency room for?

How common is TIA?

TIA is actually very common. Experts say that about 500,000 TIAs are reported each year. However, there is evidence to suggest that this number is much higher. There are several reasons for this:

• TIA is temporary: People may not realize what is happening to them. If the symptoms go away quickly, they may not go to the hospital or seek medical advice.
• TIAs leave no evidence:A TIA cannot be detected on imaging scans after it has ended. If there is brain damage, it is a stroke, not a TIA.
• Strokes often follow TIAs: A stroke can occur shortly after a TIA, but they may not realize what a TIA is.
• There are many other conditions that look like TIAs (TIA mimics): There are many conditions that cause symptoms similar to a stroke, but are not actually strokes. When a person goes to the hospital, it may not be possible to tell what is causing their symptoms.

Finally, this is what I have to say to you (Take-Home Message)

A `(Transient Ischemic Attack – TIA)` can come on suddenly and go away in a few minutes. But it can cause a lot of confusion and fear in your mind. Even if you have symptoms of a stroke and they go away in a few minutes, never ignore it! It means you need immediate medical attention.

If you have a TIA, you are at a much higher risk of having a stroke within the next 90 days. Also, half of all strokes after a TIA occur within the first two days. By getting treatment right away, you can prevent a more serious stroke. It can save your life, prevent permanent damage, and prevent loss of ability. So, be very careful about this. I hope this information is useful for you and your loved ones.