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[Cardiac arrhythmias--ECG and electrophysiologic assessment]
1Departement für Innere Medizin, Universitätsspital, Zürich.
Insights
The 12-lead resting electrocardiogram (ECG) is crucial for diagnosing arrhythmias. Complementary tools like Holter monitoring and exercise stress testing aid in diagnosis and management, while electrophysiological studies are reserved for complex cases.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Diagnostic Imaging
Context:
- The 12-lead resting surface electrocardiogram (ECG) is a primary tool for diagnosing cardiac arrhythmias.
- Cardiac rhythm disorders often exhibit spontaneous variability, necessitating advanced diagnostic methods.
- Understanding arrhythmia mechanisms is vital for effective patient management.
Purpose:
- To outline the diagnostic roles of various ECG modalities in evaluating cardiac arrhythmias.
- To detail the applications of Holter monitoring, exercise stress testing, and electrophysiological studies (EPS).
- To establish indications for advanced electrophysiological investigations.
Summary:
- Resting ECG provides initial screening for arrhythmias and underlying heart disease.
- Holter monitoring and event recorders capture intermittent arrhythmias, aiding diagnosis and therapy monitoring.
- Exercise stress testing provokes exercise-induced arrhythmias, guiding treatment adjustments.
- Electrophysiological Study (EPS) is a specialized, invasive procedure for complex tachyarrhythmias, conduction disturbances, and syncope.
Impact:
- Facilitates accurate diagnosis and classification of diverse cardiac arrhythmias.
- Guides therapeutic strategies, including antiarrhythmic drug selection and risk stratification.
- Informs clinical decision-making for invasive procedures like radiofrequency ablation.
- Highlights the importance of experienced electrophysiologists in tertiary care settings for EPS.
Abstract:
The 12-lead resting surface ECG plays a major role in the diagnosis of cardiac arrhythmias. As a screening method, it provides important information about the cardiac rhythm and possible underlying heart diseases. It enables interpretation of possible arrhythmia mechanisms, especially if the recording is obtained at the time of the rhythm disorder. Since rhythm disorders exhibit spontaneous variability, event recorders and Holter monitoring are very helpful complementary noninvasive tools in the diagnosis of cardiac arrhythmias. In addition, Holter ECG can be used in monitoring the response to antiarrhythmic agents and in risk stratification of arrhythmias in certain cardiac disease states. Physical exercise, by inducing physiological and pathophysiological changes, may provoke arrhythmias, which forms the basis of exercise-stress testing. Stress testing may also be indicated when antiarrhythmic agents are initiated or therapy altered. Electrophysiological Study (EPS) is a time-consuming and costly investigation, which in general is reserved for further evaluation of tachyarrhythmias, conduction disturbances and syncope of unknown origin and routinely performed prior to radiofrequency ablation. EPS should only be performed in tertiary-care centers by well-trained and experienced cardiac electrophysiologists.