Cardioversion is a method to restore an abnormal heart rhythm back to normal.
Cardioversion can be done using an electric shock or medications.
Electric cardioversion may use a device that can be placed inside (internal) or outside (external) the body.
External electric cardioversion uses a device called a defibrillator.
Emergency external electric cardioversion is used to treat any abnormal heart rhythm (arrhythmia) that is life threatening, such as ventricular tachycardia or ventricular fibrillation. Such a shock can be life saving.
External electric cardioversion may also be used when there is not an emergency.
An implantable cardioverter-defibrillator (ICD) is a device that is usually placed underneath the skin of your upper chest or abdomen. Wires are attached that go into the heart.
CARDIOVERSION USING DRUGS (PHARMACOLOGIC)
Cardioversion can be done using drugs that are taken by mouth or given through an intravenous line (IV). It can take several minutes to days for a this treatment to work. If you are given drugs for cardioversion in a hospital, your heart rate will be regularly checked.
Cardioversion using drugs can be done outside the hospital, most often for people with atrial fibrillation that comes and goes. However, you will need to be closely followed-up by a cardiologist.
As with electrical cardioversion, you may be given blood thinning medicines to prevent blood clots from forming and leaving the heart (which can cause a stroke).
Complications of cardioversion are uncommon, but may include:
People who perform external cardioversion may be shocked if the procedure is not done correctly. This can cause heart rhythm problems, pain, and even death.
Epstein AE, DiMarco JP, Ellenbogen KA, et al. ACC/AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices): developed in collaboration with the American Association for Thoracic Surgery and Society of Thoracic Surgeons. Circulation. 2008;117:e350-e408.
Lafuente-Lafuente C, Mah I, Extramiana F. Management of atrial fibrillation. BMJ. 2009; 339:b5216. doi: 10.1136/bjm.b5216.
Miller JM, Zipes DP. Therapy for cardiac arrhythmias. In: Bonow RO, Mann DL, Zipes DP, Libby P, . Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 37.
Morady F. Electrophysiologic interventional procedures and surgery. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 66.
Myerburg RJ, Castellanos A. Approach to cardiac arrest and life-threatening arrhythmias. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 63.