1. Between different types of cyanotic heart failure there were clear differences: in all cases of Tetralogy of Fallot the metabolic acidosis was compensated by low pCO2. In 60% of the Transpositions the metabolic acidosis was decompensated.

2. Typical cardiac findings include a rate-corrected QT interval >480 ms, functional 2:1 AV block with Bradycardia, tachyarrhythmias, and congenital heart defects (patent ductus arteriosus, patent foramen ovale, ventricular septal defect, tetralogy of Fallot, hypertrophic

3. Bifid T waves occurred in 16% of 600 normal children, 92% of 37 cases of childhood ventricular septal defect (VSD), 6 of 10 cases of tetralogy of Fallot (children) and 33% of 193 patients with cerebrovascular accidents (including 3 children).