Echocardiogram vs. ECG (Electrocardiogram): Understanding the Differences

The older we get, the more important it is to keep an eye on our cardiac function and attend routine screenings. While researching your options, you may have come across two common tests: electrocardiograms (ECGs) and echocardiograms. But what exactly do these tests involve, and which one is right for you? In this article, we’ll explain the differences between these two heart health tests, helping you better understand your options and make informed decisions.

1. What Does Each Test Do?

The primary difference between an ECG and an echocardiogram lies in their purpose. An ECG measures the electrical signals of your heart. Through this, your doctor will be able to detect issues such as irregular heart rhythms, past heart attacks, and other electrical disturbances in your heart function.

In contrast, an echocardiogram uses ultrasound waves to create detailed images of your heart’s structure. It shows how well your heart is functioning by evaluating the chambers, valves, and blood flow. This test is important for identifying potential structural issues, such as valve problems, heart enlargement, or issues with blood flow. 

2. How Are the Tests Conducted?

During an ECG test, small electrodes are placed on the skin to measure the heart’s electrical activity. If a cardiac stress test is performed, the patient will be instructed to run on a treadmill to increase heart rate. The ECG procedure is usually quick, non-invasive, and typically takes only a few minutes. No fasting is required beforehand. 

There are different types of echocardiograms, but transthoracic echocardiogram is the most common, where a transducer is placed on the skin over the heart. While this procedure is also non-invasive, it usually takes a little longer than an ECG, around 20 minutes to complete. 

In some cases, your cardiologist may recommend a Transoesophageal Echocardiogram (TEE), where a probe is inserted into the oesophagus, or food pipe. This is typically for situations where a regular echocardiogram is unable to produce clear enough images, or for assessing conditions like blood clots or heart valve issues. 

3. When Are They Recommended?

If you experience symptoms such as palpitations, chest pain, dizziness, or irregular heartbeats, your doctor may recommend an ECG. It is also used in routine cardiac screenings for those at risk of heart disease and for pre-surgical assessments. 

An echocardiogram is also recommended for people with symptoms such as chest pain, shortness of breath, fatigue, or dizziness. It checks the heart structure, strength, and function of the heart. It is also frequently used to monitor existing heart conditions, especially for individuals who have undergone heart surgery or are living with chronic heart disease.

4. Can These Tests Detect All Heart Problems?

While both ECGs and echocardiograms provide valuable insights, they focus on different aspects of heart health and don’t cover all possible conditions. ECGs are particularly effective for detecting electrical issues, such as arrhythmias, while echocardiograms are crucial for evaluating structural problems, like valve abnormalities or heart enlargement. Depending on your symptoms and medical history, your doctor may suggest additional tests or screenings to gather a more comprehensive understanding of your heart health.  

Tests to check for coronary artery blockages include CT coronary angiogram or a stress test. 

Taking the Next Step—Consult Your Cardiologist

Navigating your heart health can be overwhelming, especially when faced with complicated terms and jargon that are difficult to understand. However, with a clearer understanding of the differences between ECGs and echocardiograms, you are now better equipped to take the next step—consulting a professional heart specialist who can give you personalised advice. 

With more than two decades of experience, Dr. Leslie Tay is here to help you understand your options and guide you through the process of selecting the right test based on your health needs. If you have any questions or concerns, reach out to schedule a consultation at our clinic today.