Cardiac atheterization is an invasive diagnostic and therapeutic method in cardiology. From May 1998. to May 2000. In Sarajevo Clinical Center in cooperation with teams abroad, 36 patients with congenital heart diseases underwent pediatric heart catheterization. 33 procedures were diagnostic and 3 procedures were therapeutical. Average age of patients was 5.9 years (11 days to 17 years), 58.33% boys. After catheterization, in 21 patients (63.63%) surgical correction was done. Most frequent catheterized anomalias were: complex type of cardiac disease (VCC) 7(19.44%), Tetralogy of Fallot 5(13.88), few associated simple diseases (KAS) 4(11.11%), persistent arteriosus duct 4(11.11%), ventricular septal defect with pulmonic hypertension 3(8.33%), coarctacion of the aorta 3(8.33%), atrial septal defect 3(8.33%), atrioventricular septal defect 2(5.55%), singl ventricule 1(2.77%), isolated pulmonic regurgitation 1(2.77%). In 8/36 patients (22.22%) congenital heart disease was as a part of some syndrom (7/8 Down, 1/8 Prune-Belly). Echocardiography was complementary to heart catheterization in 28(84.85%) of cases and fullfilled in 5(15.15%) of cases. Complications during heart catheterization were presented in two patients as a heart rhythm disturbances and thromboses of femoral arteria and vein. This review show first results of invasive diagnostc procedures in pediatric cardiology, with imperative of further development in diagnostic and therapy.