Cardioversion Therapy

What is Cardioversion?

Cardioversion is a procedure that restores normal heart rhythm when the heart is beating too fast or irregularly. It is commonly used to treat:
Atrial fibrillation (AFib): A common condition where the heart beats fast and irregularly.
Atrial flutter: A rapid but more organized heart rhythm abnormality.
Supraventricular tachycardia (SVT): An abnormally fast heartbeat originating in the upper chambers of the heart.
Ventricular tachycardia (VT) with a pulse: A rare but serious condition requiring immediate treatment.

Symptoms That May Require Cardioversion

• Rapid or irregular heartbeats (palpitations).
• Shortness of breath.
• Dizziness or fainting due to poor blood circulation.
• Unexplained fatigue or weakness.
• Chest pain or discomfort (in severe cases).

Types of Cardioversion

1. Electrical Cardioversion

 A controlled electrical shock is delivered to the heart through electrode pads or paddles placed on the chest.
 The shock briefly stops the abnormal electrical activity, allowing the heart to reset to its normal rhythm.
 The procedure is performed under light sedation or anesthesia to prevent discomfort.
 It is commonly used for atrial fibrillation and atrial flutter.

2. Chemical Cardioversion

 Involves the use of antiarrhythmic medications to restore a normal heart rhythm.
 Medications may be given intravenously (IV) or orally.
 Common drugs used include:

• Amiodarone
• Flecainide
• Procainamide
• Sotalol
   This method is used when electrical cardioversion is not required or as a first-line treatment.

Preparing for Cardioversion

Pre-Procedure Tests

🔹 Medical evaluation:

• Electrocardiogram (ECG) to assess heart rhythm.
• Blood tests to check potassium, sodium, and thyroid levels.
• Echocardiogram (heart ultrasound) to detect blood clots in the heart.
• Coagulation tests (INR) if the patient is on blood thinners.

🔹 Patient Instructions:

• Fasting for 6-8 hours before the procedure.
• Stopping or adjusting medications as per doctor’s instructions.
• Taking blood thinners (anticoagulants) for 3-4 weeks before the procedure if treating atrial fibrillation to prevent stroke.

How Cardioversion is Performed

1. During the Procedure

 The patient lies on a hospital bed with continuous heart monitoring.
A sedative or mild anesthesia is given to prevent pain or discomfort.
 In electrical cardioversion:

• Electrodes (pads or paddles) are placed on the chest.
• A controlled shock is delivered to reset the heart rhythm.
   In chemical cardioversion:
• Antiarrhythmic drugs are administered intravenously or orally.
   The procedure takes only a few minutes, but the patient is monitored afterward.

Post-Procedure Recovery and Care

1. Immediately After Cardioversion

Heart rate and blood pressure are monitored for 1-2 hours.
 Some patients may feel drowsy or lightheaded due to sedation.
 Most patients can go home the same day if no complications arise.

2. Long-Term Care and Monitoring

 Continue taking blood thinners (if prescribed) to prevent stroke.
 Use beta-blockers or antiarrhythmic drugs to maintain a normal rhythm.
 Avoid driving or operating heavy machinery for 24 hours after the procedure.
 Follow up with a cardiologist in 1-2 weeks to assess the treatment outcome.

Risks and Complications of Cardioversion

Although cardioversion is generally safe, possible risks include:

• Recurrence of arrhythmia after the procedure.
• Blood clot dislodgment leading to stroke (if blood thinners were not taken properly).
• Low blood pressure or excessively slow heart rate.
• Mild skin burns from electrical shocks.
• Side effects from medications used in chemical cardioversion.

Success Rate and Long-Term Outlook

• Electrical cardioversion has a success rate of 75-95%, depending on the type of arrhythmia.
• Atrial fibrillation recurrence rate is about 50% within a year if no preventive measures are taken.
• Long-term medication and lifestyle changes help maintain a stable heart rhythm.

When is Cardioversion Recommended?

 When the patient has persistent abnormal heart rhythms affecting daily life.
 If medications alone fail to restore a normal heart rhythm.
 To reduce the risk of stroke in patients with atrial fibrillation.
 When irregular heartbeats cause severe symptoms such as fainting or chest pain.