Native aortic stenosis balloon dilatation in children is still not fully accepted as alternative to surgery. We present the results of our 15-years experience with such approach to treatment of this patients. Since the year (y) 1992. 33 balloon dilatations were performed in 29 children with native aortic stenosis aged 7,2 ± 5,5 years. Major goals of our study were to assess both the early and late outcome of the procedure such as treatment-related early/late mortality, reduction of transvalvular gradient, new aortic regurgitation, and the freedom from reintervention. Results: Before the procedure, mean echo-Doppler transvalvular pressure gradient (PG) was 82 ± 18mmHg and invasively measured peak-to-peak PG 67 ± 31mmHg. Immediately after the procedure mean peak-to-peak PG was 26 ± 20mmHg ( 60% ± 24% PG reduction). There were no procedure-related deaths. Initial outcome was successful in 29/33 (88%) interventions. Balloon dilatation was significantly related to apperance of new aortic regurgitation (p 0.001). Patients were followed-up up to 14 years after the initial procedure. During the follow-up, an average increase of transvavular echo-Doppler PG of 2,65mmHg/y was observed (p 0.017). In 6/33 (18%) pts an increment in degree of aortic regurgitation (0.5+ - 1.5+) was noticed. Up to 13y after the procedure 22/33pts (67%) were free from reintervention. For the whole group of patients an average freedom from reintervention was 9.0 ± 1.2y. Conclusion: In older infants and children with native valvular aortic stenosis primary balloon dilatation is successful paliative procedure which inital and long-term results are comparable to surgery.