What's going on inside your heart? Let's talk about cardiac imaging.

Have you ever felt a little pain in your chest, difficulty breathing, or an abnormal heart rate? At such a time, when you go to see a doctor, you may have heard him say, "Let's do a heart scan." What exactly is a heart scan, or taking pictures? What do these tests look for? Is it something to be afraid of? Okay, today we'll talk about everything in a very simple way, in a way that you can understand.

What is cardiac imaging?

Simply put, cardiac imaging is a general term for a variety of techniques used to take pictures of your heart and the blood vessels and tissues around it. Just like taking a photo with your phone, these techniques allow doctors to see clearly what's going on inside your heart, whether it's functioning healthily, or if there's a problem somewhere.

This is not a single test. It involves a number of different types of tests that your doctor will decide on based on your condition. Sometimes, two or three tests may be done to get a complete picture of your heart health.

Why would a doctor order such a test?

There are several reasons why a doctor might recommend this type of test. Imagine, your car's engine is making a strange noise, but you can't figure out why. Then the best thing to do is open the bonnet and check the engine. This is the same thing.

Here are some of the main reasons:

• Screening for heart disease: These tests can sometimes help detect heart problems before symptoms appear.
• Accurately diagnose a disease (Diagnosis): If you have symptoms such as chest pain and difficulty breathing, these are essential to determine whether the cause is a heart problem, and if so, what it is.
• Assess the extent of damage: If a heart attack occurs suddenly, these tests help to accurately measure the extent of damage to the heart.
• Measure the success of treatment: These tests are also done to see if the heart condition of someone receiving treatment for heart disease is improving and if the medication is working properly.

What are the main ways to take pictures of the heart?

Okay, now let's look at what these main types of tests are. Each of these is different. What one tests for is not what another tests for. So your doctor will choose the test that is most appropriate for you.

What is an Echocardiogram (Echo)?

This is a very common test. Just like a scan of a pregnant mother's baby, this one uses sound waves (Ultrasound) . So there is no radiation effect on your body. It is very safe. The doctor can use this to see, like a live video, whether your heart chambers and valves are working properly, how thick your heart walls are, and how well your heart is pumping blood.

What is a Cardiac CT Scan?

This is a little more complicated than a regular X-ray. Think of it like cutting a loaf of bread into slices. A CT scan takes X-rays from different angles through your heart and combines them on a computer to create a three-dimensional (3D) image of your heart. This can clearly show whether the coronary arteries, which supply blood to the heart, have calcium deposits or are blocked anywhere.

Let's talk about the Nuclear Cardiac Stress Test

Some people are a little scared when they hear this name. When they hear the word "nuclear," they think it's a big deal. But there's nothing to be afraid of. What you do is inject a very small, safe amount of radioactive material (tracer) into your vein. When this material travels with the blood to the heart, a special camera detects it and creates a map of the blood flow to the heart muscles.

This test is done in two parts:

1. When you are at rest.

2. When your heart rate increases after walking on a treadmill or exercising (stress).

By comparing these two, the doctor can determine whether a part of the heart is not getting enough blood when it is stressed. Cardiac PET (Positron Emission Tomography) and Cardiac SPECT (Single-Photon Emission Computed Tomography) are two main tests of this type.

What is a Coronary Angiogram?

This is the "gold standard" test for checking for blockages in your heart's arteries. A thin, flexible tube, called a catheter , is inserted through your wrist or a vein in your arm into a blood vessel in your heart. A special dye is then injected through the tube and an X-ray is taken. The dye makes the blood vessels show up clearly on the X-ray. It can show exactly where a vein is narrowed or completely blocked. Sometimes, if a blockage is found, doctors can insert a small mesh-like device (stent) to open it right away.

What is a Cardiac MRI?

You may have heard of MRI. It doesn't use X-rays. Instead, it uses strong magnetic fields and radio waves to create very clear, detailed images of the heart. (Oops, Malayalam slipped in. Must be careful. Sinhala only). It uses strong magnetic fields and radio waves to create very clear, detailed images of the heart. It is very useful for finding things like damage to the heart muscle, scar tissue, and swelling.

How should I prepare for this test?

The way you need to prepare may vary depending on the test you are having. Your doctor or hospital staff will give you clear instructions about this. But there are a few general things to keep in mind.

Are there any risks in these tests?

The good news is that many of these tests are very safe. They don't involve major incisions like surgery.

It is rare to have an allergic reaction to the dye used in an angiogram or CT scan. However, this is very rare. If you have had such an allergic reaction before, tell your doctor about it in advance.

X-rays and CT scans expose you to a small amount of radiation, but the amount is usually safe. A doctor orders this test because the benefits far outweigh the small risks.

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