In the laboratory for invsive cardiology, there were 900 catheterization procedures performed in the period between February 1998 and April 2001, out of which there were 56 angioplasties. 551 or 58% catheterization procedures were carried out in the coronary patients, 220 or 26% in patients with valvular diseases, 61 or 7% with congenital heart diseases, 4 or 0,5% in patients with hypertrophic cardiomyopathy, 2 or 0,2% with heart tumours, theer were 7 or 0,6% bridges and 85 or 9% had normal result. In the coronary group, 53% had three-vessel disease, 29% had two-vessel and 18% had one vessel disease. In the group of valvular diseases, 49% had mitral valve disease, 45% was with aortic valve disease and 6% had combined two valve disease i.e. aortic and mitral. Our procedures were complicated with 1 case of acute inafrction, 1 case of stroke, 2 patients had transitory ischaemic attack, one had femoral vein thrombosis, there were 6 cases of ventricular fibrillation and 12 patients had vaso-vagal reaction.