Intracardiac Electrophysiology Study (EPS)

How the test is performed:

The study is carried out in a cardiac special procedures laboratory by a trained cardiologist and technicians or nurses. Electrodes are placed inside the heart by catheterization techniques under fluoroscopy (rapid immediate X-ray images) and connected to transducers that are connected to electrocardiographic monitors. The electrode is placed near the electrical conductive tissue within the heart. Impulses form the conductive tissue are then mapped and abnormalities in the conduction system can be identified. In some people abnormal arrhythmias may be induced by an electrical shock to evaluate the effectiveness of medication in controlling an arrhythmia.

How to prepare for the test:

Test preparations are similar to those for a cardiac catheterization. Fast for 6 hours before the procedure. Specific instructions are given to you regarding medications. You must sign a consent form for the procedure. A mild sedative is usually given 1/2 hour before the procedure. You will wear hospital clothing.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

• infant test or procedure preparation (birth to 1 year)
• toddler test or procedure preparation (1 to 3 years)
• preschooler test or procedure preparation (3 to 6 years)
• schoolage test or procedure preparation (6 to 12 years)
• adolescent test or procedure preparation (12 to 18 years)

How the test will feel:

You are given sedation to relax prior to the procedure, but you are awake and able to follow instructions during the test. You will remain on a stretcher for the duration of the test. An insertion is made into a vein for threading the electrode into the heart. You are given local anesthesia, and the only sensation is one of pressure at the site. After the electrodes are in position in the heart, testing will proceed. The catheter may remain in place for several days while a series of tests are completed. Discomfort may arise from having to lie still for prolonged periods of time. The procedure may last from 1 to several hours.

Why the test is performed:

The test is performed for serious, often life-threatening, cardiac arrhythmias requiring treatment.