We report 65 cases (1970-1989). They were processing in a data base program for cardiology records. A number of selected variables, were analysed by un statistical package. The results of 230 statistical tests between means, percentage and correlations, point out statistical value on prognosis forecast. Highest heart rates an ectopic rhythms were more frequent in infants and they were associated with heart failure and the needed of treatment. Respiratory distress is associated with severity. Palpitations, precordial pain and syncops are associated with good prognosis of the disease. The heart rate by taking the pulse help us to make the diagnosis; but it is not allowed to give any treatment until we do an ECG. The use of antiarrhythmic drugs is associated with the need of complex technique studies.