CRT and ICD has known as decreasing cardiac mortality in patient with heart failure. Especially, it has reported that CRT improved cardiac systolic function, quality of life of patients with heart failure. However, CRT and primary ICD was not generalized in Korea. So the investigators will register patients who implant CRT or ICD (primary), and follow them up. During scheduled follow up, all patients will perform echocardiography, 6 minute walking test, EKG, Holter monitoring and questionnaire on QOL.
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Transthoracic echocardiography (TTE)
Timeframe: before enrollment
Transthoracic echocardiography (TTE)
Timeframe: 12 month later afer enrollment
EKG
Timeframe: before enrollment
EKG
Timeframe: 1 month later after enrollment
EKG
Timeframe: 6 month later after enrollment
EKG
Timeframe: 12 month later after enrollment
NYHA(New York Heart Association) evaluation
Timeframe: before enrollment
NYHA(New York Heart Association) evaluation
Timeframe: 1 month later after enrollment
NYHA(New York Heart Association) evaluation
Timeframe: 6 month later after enrollment
NYHA(New York Heart Association) evaluation
Timeframe: 12 month later after enrollment
6 minute walking test
Timeframe: before enrollment
6 minute walking test
Timeframe: 12 month later afer enrollment