Exercise ECG: Procedure, Findings and Risks
An exercise ECG is a diagnostic test that records the electrical activity of the heart during physical exertion. It helps detect reduced blood flow and heart rhythm disorders.
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An exercise ECG is a diagnostic test that records the electrical activity of the heart during physical exertion. It helps detect reduced blood flow and heart rhythm disorders.
What is an Exercise ECG?
An exercise ECG (also called a stress ECG, exercise electrocardiogram, or exercise tolerance test) is a diagnostic procedure in which the electrical activity of the heart is recorded while the patient performs controlled physical activity. Unlike a resting ECG, which measures the heart at rest, an exercise ECG reveals how the heart responds to increased demand. This can uncover abnormalities that would not be visible during a routine resting examination.
How Does an Exercise ECG Work?
During the test, several electrodes are attached to the patient´s chest, arms, and legs to continuously record the heart´s electrical signals. Physical exertion is typically performed on a stationary bicycle (cycle ergometer) or a treadmill. The workload is gradually increased in stages, usually every two to three minutes. Blood pressure and heart rate are monitored throughout the entire test.
When is an Exercise ECG Performed?
The exercise ECG is used in a variety of clinical situations, including:
- Suspected coronary artery disease (CAD): To identify narrowing of the coronary arteries
- Chest pain (angina pectoris): To determine whether symptoms are cardiac in origin
- Heart rhythm disturbances: To detect arrhythmias triggered by physical activity
- High blood pressure (arterial hypertension): To assess blood pressure response during exertion
- Cardiac rehabilitation: After a heart attack or cardiac surgery to evaluate recovery and exercise capacity
- Pre-sport medical clearance: Before beginning intensive athletic training
What to Expect During the Test
Patients are generally advised to avoid heavy meals and strenuous physical activity before the test. Some medications may influence the results and should be discussed with the treating physician beforehand. During the test, the ECG is recorded continuously. The test is stopped when the target heart rate is reached, when the patient experiences symptoms such as dizziness, chest pain, or severe shortness of breath, or when significant ECG changes are observed. A recovery phase is monitored after the exercise portion ends.
What Does the Exercise ECG Measure?
The primary focus of analysis is the ST segment of the ECG tracing. A depression or elevation of the ST segment may indicate myocardial ischemia -- reduced blood supply to the heart muscle. In addition, heart rhythm abnormalities, blood pressure behavior, and overall physical exercise tolerance are assessed.
Risks and Contraindications
The exercise ECG is a safe procedure performed under direct medical supervision. Serious complications such as a heart attack or life-threatening arrhythmia are extremely rare. However, there are situations where the test should not be performed (contraindications):
- Recent heart attack (within the past two weeks)
- Unstable angina pectoris
- Severe heart failure
- Uncontrolled serious arrhythmias
- Severe aortic stenosis (narrowing of the aortic valve)
- Acute inflammation of the heart (myocarditis or pericarditis)
Limitations of the Exercise ECG
While the exercise ECG is a valuable diagnostic tool, it is not infallible. It can produce both false-positive results (an abnormal finding without true disease) and false-negative results (a normal finding despite underlying disease). When results are inconclusive, further investigations such as myocardial perfusion scintigraphy, stress echocardiography, or coronary angiography may be recommended.
References
- Gibbons, R.J. et al. - ACC/AHA 2002 Guideline Update for Exercise Testing, American College of Cardiology / American Heart Association Task Force on Practice Guidelines
- Fletcher, G.F. et al. - Exercise Standards for Testing and Training: A Scientific Statement from the American Heart Association, Circulation (2013)
- Pelliccia, A. et al. - 2020 ESC Guidelines on Sports Cardiology and Exercise in Patients with Cardiovascular Disease, European Heart Journal (2021)
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