Results of the Aortic Valve Reconstruction in Children

Inclusion Criteria: * Age from 29 days to 12 years * Patient's official caregivers have to sign the informed consent after they are thoroughly explained the meaning of the study, its protocol and timelines. * Patients with manifestations, with mean gradient at the aortic valve \>40 mmHg with normal left ventricular ejection fraction (LVEF), or patients with manifestations with the mean gradient \< 40 mmHg with decreased LVEF, or patients with manifestations with severe aortic insufficiency, or patients without manifestations, but with decreased LVEF with aortic insufficiency, or patients with concomitant moderate aortic insufficiency and moderate aortic stenosis with manifestations. * Aortic Z-score over -1,5 * Absence of subvalvular and supravalvular aortic stenosis * Absence of intracardiac malformations requiring correction, except for septal defects Non-inclusion criteria: * Known hypersensitivity to aspirin, heparin, nitinol, intravenous contrast or contradictions to their administration due to other causes. * Previous replacement of the aortic valve with mechanical or xenografts. * Confirmed active sepsis or endocarditis. * Hypoplasia of the fibrous ring of the aortic valve with Z score under -1,5. * Life expectancy less than 3 years due to concomitant diseases. * Participation in another clinical research. * Indications for urgent surgery. * Intracardiac malformations requiring momentary surgical correction. * Geographical instability of a patient and his/her official caregivers, complicating significantly the constant contact during the study Exclusion Criteria: • Refusal of patient's caregivers to participate further in the study.