The Comparison With Clinical Impacts on Functional Capacity and Symptom Improvement According to the Rhythm Control in Patients With Heart Failure and Recent Onset Atrial Fibrillation

Prospective randomized (rhythm control or rate control in heart failure patients with new onset atrial fibrillation) Objective of study 1. To analyze long term outcome of patients with heart failure with new onset atrial fibrillation according to the rhythm control 2. To analyze remodeling of atrium and ventricle by the new onset AF in heart failure patients 3. To analyze the change of LV function and functional capacity according to the rhythm in patients with HF and new onset AF

Inclusion Criteria:

1. Patients with Heart failure and Atrial fibrillation within 1year (20~80 years old)
2. LA diameter < 5mm
3. LVEF 20~49%
4. patients possible to anticoagulation and anti arrhythmic drug
5. Expected survival >1yr

Exclusion Criteria:

1. Impossible to anticoagulation or anti arrhythmic drug
2. valvular atrial fibrillation ( Mitral valve stenosis, Mitral valve plasty, valve replacement)
3. LV ejection fraction < 20%
4. Structural cardiac disease
5. Catheter ablation history for AF, maze surgery
6. patient with severe medical disease
7. Impossible to anticoagulation or anti arrhythmic drug