Electrical Cardioversion in Patients with Watchman Devices

Key Safety Principles

• The European Society of Cardiology guidelines recommend positioning cardioversion paddles in the anterior-posterior configuration, keeping them as far as possible from the device location, to minimize risk of device interference 1, 2, 3
• Anterior-posterior paddle positioning is superior to anterolateral placement, reducing the risk of electrical current traveling directly through implanted devices 1, 2, 4
• The American College of Cardiology recommends using standard cardioversion energy protocols, starting with 200 J for biphasic waveforms or 200-360 J for monophasic waveforms 2, 3, 5

Energy Considerations

• Biphasic waveforms are preferred as they require less energy and have higher success rates, according to the European Heart Journal 4, 5
• The Watchman device does not have electronic circuitry that could be damaged by electrical discharge, unlike pacemakers or defibrillators, as stated by the European Heart Journal and the American College of Cardiology 1, 2

Clinical Evidence Supporting Safety

• The European Heart Journal recommends ensuring appropriate anticoagulation or TEE-guided cardioversion according to standard AF guidelines, regardless of Watchman presence 6, 7
• Direct oral anticoagulants are recommended over warfarin for patients undergoing cardioversion, as suggested by the European Heart Journal 6, 7

Important Caveats

• The American College of Cardiology states that all standard cardioversion contraindications and precautions remain relevant, including excluding digitalis toxicity and ensuring serum potassium is in normal range 1, 2, 3
• The European Heart Journal recommends monitoring for post-cardioversion arrhythmias, particularly in patients with sinus node dysfunction 1, 2
• The American College of Cardiology suggests using appropriate sedation/anesthesia during cardioversion 2, 3, 5

Hemodynamic Instability

• The American College of Cardiology recommends proceeding immediately to electrical cardioversion if the patient is hemodynamically unstable, regardless of Watchman device presence, with a Class I recommendation for AF with severe hemodynamic compromise 9, 6

Post-Cardioversion Monitoring

• The European Heart Journal recommends monitoring patients for at least 3 hours after cardioversion for arrhythmias and hemodynamic stability 4
• The American College of Cardiology and the European Heart Journal suggest watching for bradycardia, sinus arrest, or ventricular arrhythmias after cardioversion 1, 2, 3