Three months after the intervention (n = 22), the mean left ventricular ejection fraction was 61.2 ± 7.7% and 12 months later (n = 13) the value of left end-diastolic left ventricular diameter of the group the successful intervention was 1.1 ± 1.2 SD, while the unsuccessful intervention was 4.2 ± 2.7 SD.