1. the prevention or treatment of cardiac arrhythmia (irregular heartbeat)
Usage: medical/technical term; often used as a modifier in phrases like 'antiarrhythmia drug' or 'antiarrhythmia therapy'

Examples

• The cardiologist prescribed an antiarrhythmia medication to stabilize the patient's heartbeat.
• Antiarrhythmia devices such as pacemakers help regulate abnormal heart rhythms.
• The hospital's antiarrhythmia unit specializes in treating patients with irregular heartbeats.
• New antiarrhythmia therapies have improved outcomes for patients with atrial fibrillation.
• The drug's antiarrhythmia properties made it an effective treatment option.