DC cardioversion and coronary artery spasm

Area of Science:

• Cardiology
• Electrophysiology
• Medical Complications

Background:

• Atrial fibrillation is a common cardiac arrhythmia requiring treatment.
• Electrical cardioversion using direct current (DC) shock is a standard treatment for atrial fibrillation.
• ST segment elevation on electrocardiogram (ECG) typically indicates myocardial ischemia or infarction.

Observation:

• A 55-year-old male patient experienced significant ST segment elevation on ECG after undergoing DC shock for lone atrial fibrillation.
• The ST segment elevation was transient and not associated with other signs of acute coronary syndrome.

Findings:

• The observed ST segment elevation following DC shock is hypothesized to be caused by coronary artery spasm.
• This suggests a potential, albeit rare, complication of direct current electrical stimulation on coronary arteries.
• The mechanism may involve direct electrical effects or autonomic nervous system responses triggered by the shock.

Implications:

• Clinicians should be aware of this potential complication during and after electrical cardioversion.
• Distinguishing this artifact from true ischemic events is crucial for appropriate patient management.
• Further research may elucidate the precise mechanism and incidence of DC shock-induced coronary artery spasm.