Overview

DC (Direct Current) Cardioversion is a procedure used to restore normal heart rhythm in patients experiencing certain types of abnormal heart rhythms (arrhythmias), most commonly atrial fibrillation or atrial flutter. During the procedure, a controlled electrical shock is delivered to the heart, which briefly stops all electrical activity in the heart, allowing the normal heart rhythm to restart.

​

Before the Procedure

Anticoagulation (Blood Thinning): If your abnormal rhythm has been present for more than 24 48 hours, you will likely need to take blood-thinning medication for at least 3-4 weeks before the procedure. This is to reduce the risk of blood clots that may have formed in the heart.

 

Transesophageal Echocardiogram (TEE): In some cases, especially if it's unclear how long you've been in an abnormal rhythm, you may need a special ultrasound test called a TEE to check for blood clots in the heart before proceeding.

 

Fasting: You will be instructed not to eat or drink anything for 6-8 hours before the procedure.

 

Medication Review: Your doctor will review your current medications and may ask you to adjust certain medications before the procedure.

 

Pre-procedure Tests: Blood tests, an ECG, and possibly a chest X-ray will be performed.

​

During the Procedure

1. Preparation: You will be positioned on a bed in a specially equipped room. Monitoring equipment will be attached to track your heart rhythm, blood pressure, and oxygen levels throughout the procedure.

2. Sedation: A short-acting sedative will be administered through an IV line to ensure you are comfortable and asleep during the procedure. This is not general anesthesia, but you will not be aware of the procedure while it is happening.

3. Electrode Pad Placement: Two adhesive electrode pads will be placed on your chest, usually one on the front and one on the back, or both on the front of your chest.

4. Electrical Shock Delivery: Once you are sedated, the doctor will deliver a precisely calibrated electrical shock through the electrode pads. This shock momentarily stops your heart's electrical activity, allowing it to reset to its normal rhythm.

5. Monitoring: Your heart rhythm is immediately monitored to determine if the cardioversion was successful.

6. Repeat Shock (if needed): If the first shock does not restore normal rhythm, additional shocks at higher energy levels may be delivered.

​

After the Procedure

Recovery: You will be monitored in a recovery area until the effects of sedation wear off, usually for 1-2 hours.

​

Discharge: Most patients can go home the same day, but you will need someone to drive you home as you should not drive for 24 hours after receiving sedation.

​

Skin Irritation: You may notice some redness or irritation where the electrode pads were placed, which typically resolves within a few days.

​

Medication Continuation: You will likely need to continue taking blood-thinning medication for at least 4 weeks after the procedure, even if your normal rhythm is restored. Your doctor will advise you on long-term medication plans.

 

Follow-Up: A follow-up appointment will be scheduled to check your heart rhythm and overall recovery.

 

Benefits

Immediate Results: DC cardioversion can restore normal heart rhythm immediately in many cases.

 

Symptom Relief: Successful cardioversion often leads to significant improvement in symptoms such as palpitations, fatigue, shortness of breath, and reduced exercise tolerance.

 

Improved Heart Function: Restoring normal rhythm can improve the efficiency of your heart's pumping action.

 

Reduced Stroke Risk: In the long term, returning to normal rhythm may reduce the risk of stroke, although continuation of blood-thinning medication is often still necessary.

 

Brief Procedure: The actual cardioversion procedure typically takes only a few minutes, with the entire appointment usually lasting less than half a day.

 

Minimal Recovery Time: Most patients can return to normal activities the day after the procedure.

 

Risks and Considerations

While DC cardioversion is generally safe, there are some risks and considerations:

 

Temporary Rhythm Disturbances: Rarely, the procedure may cause temporary heart rhythm disturbances.

 

Skin Burns: Minor skin irritation or burns may occur where the electrode pads were placed.

 

Dislodged Blood Clots: There is a small risk (about 1%) that a blood clot could dislodge during the procedure and travel to other parts of the body, potentially causing a stroke or other issues. This risk is minimized by proper anticoagulation before the procedure.

 

Medication Side Effects: The sedative used during the procedure may cause temporary side effects such as nausea, confusion, or drowsiness.

 

Recurrence: Although cardioversion is often initially successful, the abnormal rhythm may return. About 50% of patients with atrial fibrillation may experience a recurrence within a year.

 

Sore Chest: Some patients may experience chest soreness for a few days following the procedure.

 

Pacemaker or Defibrillator Interference: If you have a pacemaker or implantable defibrillator, special precautions are needed during cardioversion.

 

When to Seek Medical Attention

Contact your doctor immediately or seek emergency care if you experience:

 

Signs of Stroke: Sudden numbness or weakness in the face, arm, or leg; sudden confusion; trouble speaking or understanding; sudden trouble seeing; sudden trouble walking, dizziness, or loss of balance; sudden severe headache.

 

Severe Shortness of Breath: Difficulty breathing that is worse than usual.

 

Chest Pain: Especially if it's severe or different from your usual symptoms.

 

Return of Irregular Heart Rhythm: If you notice your heart rhythm becoming irregular again.

 

Excessive Bleeding: If you're on blood-thinning medication and notice unusual bleeding.

 

Alternative Treatments

If DC cardioversion is not suitable for you or if the abnormal rhythm returns, other treatment options may include:

 

Medications: Various medications can be used to control heart rate or maintain normal rhythm.

 

Catheter Ablation: A procedure that uses heat or cold energy to destroy small areas of heart tissue causing the abnormal rhythm.

 

Pacemaker Implantation: In some cases, a pacemaker may be recommended to help regulate the heart's rhythm.

 

Maze Procedure: A surgical procedure that creates a pattern of scar tissue to help prevent abnormal electrical signals from causing arrhythmias.

 

Conclusion

DC cardioversion is a generally safe and effective procedure for restoring normal heart rhythm in patients with certain types of arrhythmias. While it doesn't cure the underlying condition that caused the abnormal rhythm, it can provide significant symptom relief and improvement in quality of life. Your healthcare team will work with you to determine if this procedure is appropriate for your specific condition and to provide ongoing care afterward.​

​

This leaflet is intended for informational purposes only and should not replace professional medical advice. Please consult your healthcare provider for any questions or concerns regarding your health or treatment options.