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Cardiolucent

Treatment

Cardioversion (Electrical or Chemical)

Restoring normal rhythm in atrial fibrillation, flutter, and other tachyarrhythmias.

Cardioversion is the conversion of an abnormal heart rhythm back to normal sinus rhythm. It can be performed electrically — a brief synchronized shock delivered through pads on the chest while the patient is under sedation — or chemically, using an intravenous antiarrhythmic drug. Cardioversion is most commonly used for atrial fibrillation and atrial flutter, but is also used for other tachyarrhythmias when rhythm restoration is the goal. Before any planned cardioversion, the risk of dislodging a clot from the left atrium must be addressed with adequate anticoagulation or transesophageal echocardiography. Dr. Kedan evaluates whether cardioversion fits your situation and coordinates the procedure through Cedars-Sinai.

What This Treatment Approach Includes

  • Confirmation that rhythm control is the right strategy (vs rate control)
  • Anticoagulation for at least three weeks before, or transesophageal echo to exclude atrial clot
  • Pre-procedure planning: medications, electrolytes, anesthesia clearance
  • Choice between electrical (synchronized DC cardioversion) and chemical (IV antiarrhythmic) approach
  • Procedure performed at Cedars-Sinai under monitored anesthesia
  • Continued anticoagulation for at least four weeks afterward (often longer based on stroke risk)
  • Maintenance antiarrhythmic medication or ablation planning to prevent recurrence

How It Works

Electrical cardioversion delivers a brief, synchronized electrical shock through pads placed on the chest, which depolarizes the heart simultaneously and allows the natural pacemaker (the sinus node) to take over. Chemical cardioversion uses an intravenous antiarrhythmic drug (such as ibutilide or procainamide for atrial fibrillation, or amiodarone in selected settings) to terminate the abnormal rhythm pharmacologically. Both approaches restore normal rhythm in many patients, with electrical cardioversion generally more reliable for atrial fibrillation.

Who This Is For

  • Symptomatic atrial fibrillation or atrial flutter where rhythm control is the goal
  • New-onset atrial fibrillation in a patient who would benefit from immediate rhythm restoration
  • Hemodynamically unstable atrial fibrillation requiring urgent rhythm conversion
  • Preparation for assessment of true symptom burden in sinus rhythm
  • Bridge to ablation when rhythm restoration is needed before the procedure
  • Post-cardiac surgery atrial arrhythmias not converting with medical therapy
  • Failed rate control strategy with persistent symptoms

Monitoring and Follow-Up

Anticoagulation must be continued for at least four weeks after cardioversion regardless of stroke risk, because the atrium remains mechanically stunned and prone to clot formation even after electrical recovery of sinus rhythm. Longer-term anticoagulation depends on individual stroke risk profile, not on rhythm. Recurrence is common, particularly in the first weeks, and a rhythm monitor or follow-up EKG confirms durability. Dr. Kedan provides the longitudinal follow-up and adjusts maintenance strategy based on response.

How Cardiolucent Manages This

The decision to pursue cardioversion involves a series of judgment calls — pre-procedure anticoagulation timing, electrical vs chemical approach, maintenance strategy afterward, and when ablation becomes the better long-term answer. Dr. Kedan walks through these in extended visits, coordinates the procedure at Cedars-Sinai, and remains the continuity cardiologist before and after. Same-day labs, POCUS for atrial assessment, and direct access keep the post-cardioversion window closely supervised.

Common Questions

Frequently Asked Questions

What is cardioversion, exactly?
Cardioversion converts an abnormal heart rhythm — most commonly atrial fibrillation or atrial flutter — back to normal sinus rhythm. It can be done electrically (a brief synchronized shock under sedation) or chemically (an intravenous antiarrhythmic drug). It is a single intervention, not ongoing therapy, though maintenance strategies typically follow.
How is the choice between electrical and chemical made?
Electrical cardioversion is generally more effective and faster for atrial fibrillation; chemical cardioversion may be appropriate when sedation is undesirable, when the patient is already in a monitored setting, or in specific clinical scenarios. The choice is individualized, and many patients receive a combination — a loading dose of an antiarrhythmic before electrical cardioversion to improve success rates.
Why do I need anticoagulation before cardioversion?
Atrial fibrillation lasting more than 48 hours can allow clots to form in the left atrium. Restoring sinus rhythm and atrial contraction without first addressing those clots can dislodge them and cause stroke. Standard preparation is three weeks of therapeutic anticoagulation, OR a transesophageal echocardiogram to confirm the absence of clot, before proceeding.
Is cardioversion painful?
No. Electrical cardioversion is performed under monitored anesthesia, so you are asleep during the shock and do not feel it. The skin where the pads are placed may be mildly irritated afterward.
What are the risks?
Cardioversion is generally safe but carries small risks of stroke (greatly reduced by adequate anticoagulation), skin irritation at pad sites, transient arrhythmia, and rarely heart muscle injury. The sedation itself has standard anesthesia-related risks. The interventional team reviews specifics.
How often does the rhythm stay normal?
Many patients revert to atrial fibrillation within days, weeks, or months of cardioversion without maintenance therapy. With antiarrhythmic medication, sinus rhythm is maintained longer in a meaningful proportion of patients. Cardioversion often serves as a step toward defining symptoms in sinus rhythm or as a bridge to ablation rather than as a definitive cure.
Do I still need anticoagulation after a successful cardioversion?
Yes — for at least four weeks regardless of your baseline stroke risk, because the atrium remains mechanically stunned and prone to clot. Long-term anticoagulation beyond that depends on your individual stroke risk (CHA2DS2-VASc score) and is not based on rhythm alone.
What if the cardioversion does not work?
Failure to convert, or rapid recurrence, is not unusual. Options include repeat cardioversion after antiarrhythmic loading, transition to rate control with anticoagulation, or referral for catheter ablation. The path forward is individualized to your symptoms, atrial size, and overall trajectory.
What is the recovery like?
Most patients go home the same day and resume normal activity within 24 hours, with brief restrictions related to the sedation itself. Skin at pad sites may be tender for a few days. Maintenance medications are confirmed before discharge.
How do I start a cardioversion evaluation with Dr. Kedan?
Schedule a consultation at the Beverly Hills office with prior EKGs and rhythm history. Cardiolucent is a concierge practice and does not bill Medicare or insurance, though a detailed superbill is provided for out-of-network reimbursement. The procedure itself is performed at Cedars-Sinai. Call (310) 304-5555 or use the contact form.

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Medical Disclaimer

The information on this site is for general educational purposes only and is not medical advice, diagnosis, or treatment. Reading this site does not create a doctor–patient relationship. Always consult a qualified healthcare professional for personal guidance. If this is an emergency, call 911. Mentions of medications, devices, or procedures are informational and not endorsements. Full medical disclaimer.

†Some listed indications involve investigational/off-label use. Learn more.