Cardioversion uses an external defibrillator to return your heart to a normal rhythm.
First you are given a sedative. Then a doctor places paddles or patches either on your chest or on your chest and back. They send an electric current to your heart. This resets your heart rhythm. The rhythm is more likely to return to normal and stay there if you also take antiarrhythmic medicines before and after this treatment.
Taking medicines alone—without cardioversion—is another way to get back your normal heart rhythm. But they don't work as well as cardioversion. And they can have serious side effects.
What are the risks of cardioversion?
Having a stroke is the most serious risk. Cardioversion may dislodge a blood clot in your heart. This can cause a stroke. But you can lower this risk quite a bit by taking certain steps:
* If your atrial fibrillation has lasted for more than 48 hours, your doctor may have you take anticoagulants, or blood thinners, several weeks ahead of time.
* Your doctor may use a test called echocardiogram to see if you have a clot in your heart. If you don't, you won't have to take a blood thinner first.
* Your doctor may have you take a blood thinner for a few weeks after the treatment.
Cardioversion also has other risks:
* You can get a small area of burn on your skin where the paddles are placed.
* Antiarrhythmic medicines used before and after this treatment may cause a deadly irregular heartbeat. The cardioversion itself may also cause this.
* You could have a reaction to the sedative given to you before the procedure. But harmful reactions are rare.
* The procedure may not work. You may need more cardioversion or other treatment.
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