Cardioversion is a treatment to correct certain types of abnormal heart rhythms, converting them to a normal rhythm through the use of a carefully timed and well-controlled electric shock to the chest wall.
Why do I need it?It is a treatment to correct certain types of abnormal heart rhythms. The goal is to convert an abnormal cardiac rhythm to a normal one through the use of a carefully-timed and well-controlled electric shock to the chest wall.
What are the risks? Blood clots that may result in stroke are the main risk. Anticoagulant medications may be given both before and after the cardioversion to reduce the risk. A transesophageal echocardiogram (TEE) may also be performed prior to the cardioversion to detect any blood clots. A TEE is a type of echocardiogram in which harmless soundwaves are sent to your heart through a small scope placed down your throat. The motion of the echoes is traced on a machine and recorded on film.
How do I prepare?- No food or drink after midnight.
- The pre-admission nurse will call to discuss the procedure with you. The nurse will provide you an exact check-in time and answer any questions.
- Arrange for someone to drive you home.
- Avoid driving for at least 24 hours after the test.
What can I expect during the test?- You will be connected to a heart monitor and given anesthesia. You will then go to sleep.
- Two large, sticky electrodes will be attached to your chest and connected to a defibrillator. (The device is calibrated by the physician to deliver the proper electrical charge for you, and the electrical charge’s intensity and timing are precisely controlled.)
- A successful cardioversion may require several electrical charges to be given at incrementally larger energy levels. Each charge lasts only a second, and you should not feel anything.
- Expect to be at the hospital for approximately four hours.
How long does it take?The procedure takes about thirty minutes. You will then spend several hours in recovery during which you will be monitored to ensure that your heart rhythm and blood pressure are stable. (You may find some mild irritation or redness to the skin of the chest that can be treated with ointment.)
How do I get the results?Your cardiologist or primary care provider will review the test results and medication instructions with you before you go home.