Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

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Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

Patients are encouraged to visit the hospital based on the measured intrathoracic impedance value mounted on the implantable defibrillator, and randomized to 3 groups: 1 diuretic, 2 nitrates, 3 heart failure education, for patients who are prone to heart failure Allocation was made. And one week later, the patients went to the outpatient clinic and undertook same examination. The number of patients registered was 156 from 10 institutions. Nineteen patients were randomly assigned to the diuretic group, the nitrate group, and the heart failure education group, and one week later, they visited the outpatient clinic and performed various tests again. There was no statistically significant difference in patient background among the 3 groups. Improvement of BNP and improvement of intrathoracic impedance were observed in all 3 groups after one week of treatment.

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Grant amount：\4810000 （ Direct expense: \3700000 、 Indirect expense：\1110000 ）

Although the number of cases of idiopathic ventricular fibrillation gradually increases, as the affected individual itself is a rare disease, it is still in the process of collecting data. We also examined and analyzed the Brugada syndrome considered to be included in idiopathic ventricular fibrillation in a broad sense. In some cases of idiopathic ventricular fibrillation, it was found that there is a case in which low voltage area was partially recognized by ventricular endocardial mapping, and the effectiveness of ablation treatment is expected.

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