One case of Tachycardia-Bradycardia Syndrome was reported with brief review. A 42 year old woman was admitted to Seoul national University Hospital because of palpitation and dizziness. She had had the intermittent episodes of such attacks for 4 years. The electrocardiogram checked 3 days prior to admission showed atrial fibrillation but the electrocardiogram at admission revealed irregular bradycardia with wandering pacemaker. The patient had complained palpitation and dizziness throughout the hospital days, but only one attack of Adams-Stokes Syndrome was developed. She was improved symptomatically by isoproterenol infusion during the hospital course.