Electrophysiology Study (EP)

Several tests are available to determine the cause of an abnormal heart rhythm (arrhythmia), including electrocardiogram (ECG or EKG), echocardiogram, Holter monitoring and tilt table testing.  If more information is needed after preliminary testing, an electrophysiologist may order an electrophysiology study, an accurate method for examining the heart's electrical system.

An electrophysiology study is performed in a catheterization lab.  Long thin wires (catheters) with tiny electrodes are inserted into the body and moved toward the heart.  Within the chambers of the heart, these electrodes record electrical impulses of an arrhythmia and can help cardiologists pinpoint the location of the problem.  The electrodes can also deliver electrical impulses to induce (bring on) an arrhythmia so that the cardiologist can observe the heart's function.

Using the results of this study, a cardiologist is able to:

1. Diagnose the cause of symptoms, such as palpitations, lightheadedness or fainting spells
2. Pinpoint the location of a known arrhythmia and determine the best treatment
3. Monitor the effectiveness of medication
4. To decide whether catheter ablation is an appropriate treatment
5. To decide whether an implantable device (pacemaker or defibrillator) is appropriate