Children's Cardiac Clinic, the Institute of Paediatrics, led by Janusz Skalski is one of the best centres in Poland specialising in surgical treatment of children with heart defects. The information was given by the Polish Association of Cardiac Surgeons in April and October this year. The Cardiac Surgery Register shows that the operations carried out by the Clinic have achieved best results in treatment and met the highest level of complexity according to the Aristotle Basic Complexity.