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[Strategy for cardiac arrhythmias in acute coronary syndrome].

Acute coronary syndrome causes several types of arrhythmia because of its electrical instability and ischemia. The most important arrhythmia is ventricular tachycardia which degenerates to ventricular fibrillation. Prompt direct current cardioversion will be needed and prevention of ventricular tachyarrhythmia by potassium channel blocker became more popular in Japan. Nifekalant or amiodarone should be selected. Atrial fibrillation also occurred in the patients with acute coronary syndrome, and it may deteriorate hemodynamics condition. Therefore, termination and prevention of atrial fibrillation is another important issue in acute coronary syndrome. Aprindine, amiodarone, or bepridil will be the choice to prevent recurrent atrial fibrillation after direct current cardioversion.