An electrocardiogram (ECG or EKG) is a simple and fast procedure that is used to evaluate the electrical activity of the heart, which is measured in "waves." Variations in the waves may indicate problems with the heart.
When a problem develops with the heart’s rhythm, there may or may not be any symptoms. An electrophysiological study (EP study) is an invasive procedure that tests the heart's electrical system to determine the cause of the dysrhythmia.
When symptoms such as dizziness, fainting, low blood pressure, prolonged fatigue, and palpitations continue to occur without a definitive diagnosis obtained with a resting ECG, your physician may request an ECG tracing to be run over a long period of time, using a Holter monitor.
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