A stress echocardiogram (or stress echo) is a test that evaluates how well your heart muscle pumps blood when it is working hard. Some heart issues, like narrowed coronary arteries, may not show any signs when you are resting. However, when the heart is beating fast during exercise, the narrowed arteries cannot supply enough blood, causing the heart wall to pump weakly.
During the test, ultrasound images of your heart are taken at rest. You are then asked to exercise on a treadmill or stationary bike (or given medication to mimic exercise if you cannot walk), and new images are taken immediately afterward.
Common Indications for a Stress Echocardiogram
- Investigating chest pain or shortness of breath during physical activity.
- Diagnosing suspected coronary artery disease (blocked heart arteries).
- Evaluating the effectiveness of heart treatments like angioplasty or bypass surgery.
- Assessing heart valve function under stress.
- Checking your heart's safety before starting a major exercise program or undergoing surgery.
What exactly does a stress echocardiogram show?
The scan shows the movement of your heart's walls. If a section of the heart wall moves weakly or does not squeeze properly after stress, it indicates that the artery supplying that specific area is narrowed or blocked.
How should I prepare for a stress echocardiogram?
Do not eat or drink anything except water for 3 to 4 hours before the test. Avoid coffee, tea, cola, chocolate, and any medications containing caffeine for 24 hours, as caffeine can interfere with your target heart rate. Wear comfortable sports shoes and two-piece clothing suitable for exercise.
Do I need to stop taking medication?
Yes, you may need to stop certain heart medications (such as beta-blockers) for 24 to 48 hours before the test, as they prevent your heart rate from rising during exercise. Discuss this strictly with your referring doctor or cardiologist beforehand.
What happens when I arrive for my scan?
You will go to the stress lab. The technician will place sticky patches (electrodes) on your chest to monitor your ECG. They will measure your resting blood pressure and take a set of resting ultrasound images of your heart while you lie on your side.
How is the procedure performed?
You will exercise on a treadmill or stationary bike. The difficulty will increase every few minutes. The team will monitor your blood pressure and heart rate. Once your heart rate reaches its target or if you feel too tired, you will stop. You must quickly move back to the scan couch, and the cardiologist will immediately take new ultrasound images of your beating heart within 60 seconds before it slows down.
How long does a stress echocardiogram take?
The entire appointment takes about 45 to 60 minutes. The actual exercise portion lasts only 7 to 12 minutes.
Is there any discomfort?
You will feel tired, warm, and out of breath from the exercise, which is normal. The technician will press the ultrasound probe firmly against your chest, which can feel slightly uncomfortable but is not painful.
Are there risks?
Yes, but they are very small. The risk of a serious complication (like a heart attack or severe abnormal rhythm) during the exercise portion is less than 1 in 2,000. The test is continuously monitored by a medical team trained to handle emergencies.
Can children have this scan?
Yes. Children with congenital heart conditions can have this scan to evaluate their exercise tolerance.
Can I have this scan if I am pregnant?
This scan is generally avoided during pregnancy, as maternal physical stress and potential heart rate drops can affect blood flow to the baby.
When will I get my results?
The cardiologist will compare the rest and stress images side-by-side. The results are usually discussed with you immediately, and a final report is sent to your referring doctor within 24 hours.
What if the scan finds something?
If the scan shows poor wall movement under stress, it indicates coronary artery blockage. Your doctor will discuss next steps, which could include starting heart medications, scheduling a coronary angiogram, or planning angioplasty.
Conclusion
A stress echocardiogram is a safe and highly effective way to evaluate your heart under load. Remember to fast for 3 to 4 hours, avoid caffeine for 24 hours, and clarify with your doctor if you need to hold any heart medications.