Common Heart Tests Explained: ECG, Echocardiogram, and Stress Tests

When you first encounter chest discomfort or find that your heart is beating irregularly, your GP will likely ask you to take a few cardiac tests to understand what the problem is. The thing is, most people don’t really know what these tests actually measure and why one is chosen first over another. So, if looking for more clarity on the matter, read on as we break down three of the most common cardiac heart tests and figure out what each of them reveals about your heart health.

What is an ECG?

Let’s get the simplest, yet most informative tests for heart health out of the way first. An ECG, short for Electrocardiogram, is a procedure in which small electrodes are put on your chest, arms, and legs. These, in turn, detect electrical signals that your heart produces with each beat – revealing problems with timing, strength, or pathway. During this test, you are asked to lie still for about five minutes while the machine does its work – recording your heart’s rhythm. It is not an uncomfortable procedure by any means, and all you really feel is the stickiness from the electrode pads on your skin.

This test is usually the best at identifying an arrhythmic heartbeat, which can cause palpitations or dizziness. It can also detect abnormalities in which electrical signals move too slowly or take unusual routes through the heart muscle. But most important of all, it can show evidence of a previous heart attack or any ongoing damage to our heart tissue.

All this makes an ECG very useful to doctors as a first-line investigation – when you first walk in with your specific heart issue. Whether it is chest pain, palpitations, unexplained dizziness, or fainting episodes, this test is often effective at providing quick answers about your heart health while also helping doctors determine whether further testing is necessary.

Speaking of which, you must note that a normal ECG doesn’t rule out all heart problems. It only captures a small bit of your heart’s activity and, as such, is incapable of assessing conditions such as valve disease or chamber enlargement. If your ECG comes back normal but the symptoms persist, don’t panic. It simply means that it is time to get a few more tests.

What is an Echocardiogram?

Not to be confused with an ECG, an echocardiogram is an ultrasound of the heart that creates moving images of the heart’s organs. In a way, they are kind of similar to the pregnancy scans that an expecting mother receives – one that allows doctors to visualise the heart’s structure and function in real time.

During this test, someone from the medical staff will first apply a special gel to your chest and will then move a handheld probe across your skin. This handheld then sends sound waves through your chest wall which, in turn, bounce off your heart, creating detailed images on a monitor. This will take about 30-45 minutes and, like ECG, will be a completely painless process. In fact, the test’s complete safety profile makes it suitable even for pregnant women and elderly patients.

What makes an echocardiogram super valuable is its ability to assess our heart’s function and overall health at the same time. It not only shows the size and thickness of your heart chamber, but also how well the walls contract with each beat and whether your valves open and close properly. Not to mention, the test also measures ejection fraction, which indicates how efficiently your heart is pumping blood right now with each contraction.

But perhaps no test is more important than this for diagnosing valve disease, in which the valves of your heart become either too narrow or too leaky. An echocardiogram is also essential for evaluating heart failure and cardiomyopathy, conditions where the heart muscle weakens or thickens abnormally. Your doctor will ask you to get this test if you’re struggling with shortness of breath, if there is a heart murmur, or when your ECG shows some abnormality that warrants further testing.

What are stress tests?

Stress testing exists to check one thing: to see how your heart performs when it is pushed a little harder. Doctors do this to check if your coronary arteries are narrowed – should that be the case, your heart muscle will not receive enough blood during exertion, leading to symptoms or electrical changes.

The most common way doctors approach this is with an exercise treadmill test, where you walk on a treadmill that gradually increases speed and incline. While you’re doing this, the medical staff will monitor your ECG, blood pressure, and symptoms. For people who are unable to exercise – either due to mobility issues or severe breathlessness – they can go through pharmacological stress tests instead, which use medication to simulate the heart’s response to exertion.

Stress testing is highly effective at detecting coronary artery disease, especially when symptoms occur only during physical activity. The test can also unmask exercise-induced arrhythmias that may never appear on a regular ECG. But it is worth noting that this test is typically prescribed for people who experience heart problems after exertion during activities, specifically those they could previously manage with ease. Putting that into perspective, it should be clear that stress tests are not suited for everyone. Patients with severe aortic stenosis, recent heart attacks, or unstable symptoms require different diagnostic approaches. As such, your cardiologist will have to take your individual situation into account first before recommending this investigation.

Which test is right for you?

Each cardiac test we’ve discussed today exists to answer a few specific questions rather than being  different ways to examine the same problem. So when you think about it, these investigations complement rather than replace one another. A patient with palpitations might need only an ECG, while someone with breathlessness could require both an ECG and an echocardiogram. Exertion chest pain often warrants all three tests to build a complete picture.

The key to all this is making sure that you’re following the advice of a proper specialist. Only a good cardiologist in London can determine which of these three tests is suited for your case, so get this done first to ensure nothing important gets missed. At the end of the day, all you need is a bit of vigilance and timely action to make all the difference in catching heart issues before they pose a serious risk to your life. So if there is one thing you must take from all this, it is this: Just stay on your toes in matters of the heart and seek help as soon as you need to. After all, the right action at the right time can make all the difference.