Diagnostics·Diagnostics
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Cardioversion is a medical procedure that uses a controlled electric shock to restore a normal heart rhythm in people with certain irregular heartbeats (arrhythmias). Before the procedure, you will need blood tests to check your overall health, ensure the blood thinner levels are safe, and rule out other conditions that might affect the procedure. These tests help your doctor plan a safer cardioversion.
Key facts
Cardioversion is a common procedure for people with atrial fibrillation or atrial flutter, especially when medications don't control the rhythm.
It mainly affects adults with heart rhythm disorders, often over 60, but can be performed at any age if needed.
Your doctor diagnoses an arrhythmia using an ECG (electrocardiogram) which records your heart's electrical activity. Blood tests help confirm the arrhythmia type and check for underlying causes like electrolyte imbalances or thyroid problems.
You will have blood drawn from a vein in your arm, usually a few days before the procedure. It takes about 10 minutes. Your doctor will review the results to see if any adjustments are needed before the cardioversion.
Cardioversion is done under light sedation or anaesthesia. Pads or paddles on your chest deliver a brief electric shock. The goal is to reset the heart's rhythm to normal. Blood tests beforehand help make sure the procedure is safe.
Doctors may also use medicines to control heart rate or rhythm (called antiarrhythmics) before or after cardioversion. The specific medicine and dose depend on your condition and blood test results. Your healthcare provider will decide what's best for you.
If cardioversion does not work or arrhythmias keep coming back, a procedure called catheter ablation may be considered. This involves threading a thin tube to the heart to destroy the tiny area causing the abnormal rhythm.
After successful cardioversion, most people return to normal activities within a day or two. You may need to avoid heavy lifting or driving for a short time.
Eat a heart‑healthy diet with plenty of fruits, vegetables, whole grains, and lean protein. Limit salt and saturated fats. Moderate exercise, like walking, is usually safe after the procedure – ask your doctor when to start.
Having a heart rhythm problem can be worrying. It is normal to feel anxious or stressed, especially before a procedure. Talk to your healthcare team about any concerns – they can offer support and resources.
Not all arrhythmias can be prevented. But managing risk factors like high blood pressure, diabetes, and obesity can lower your chance of developing them. Staying active and avoiding heavy alcohol use also help.
While vaccines do not prevent arrhythmias, staying up‑to‑date with flu and pneumonia shots is important for people with heart conditions.
If you have a family history of heart rhythm problems or certain conditions (like sleep apnoea), your doctor may recommend periodic ECGs.
With proper care – including pre‑procedure blood tests and follow‑up – cardioversion is safe and effective for many people. Most regain a normal rhythm quickly. Medications and lifestyle changes can help maintain a healthy heart over time.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 8, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.