Objective — analysis of clinical and functional parameters of patients undergoing correction of subaortic obstruction and study of causes of repeated interventions. Material and methods. The study included 33 patients operated for subaortic stenosis in Federal Center for Cardiovascular Surgery (Penza) for the period from November 2008 to August 2012. Age varied from 7 months to 61 years (median age 5 years old). Membrane location, its distance from the aortic valve, circular or semilunar type of membrane, involvement of  mitral valve structures, presence of concomitant congenital heart diseases (CHD), maximal and average pressure gradient in left ventricular outflow tract (LVOT), presence and degree of aortic insufficiency before and after surgical correction have been estimated. Results. The actuarial freedom from reoperations was 68.3±16.6% for 3.28 years. The recurrence incidence in our study was 12.1%. In patients younger than 18 years recurrence was diagnosed in 10.7% of cases, among adults — in 20% of cases. Statistical relationship between the possible risk factors calculated using the Spearman rank correlation showed positive significant correlations between recurrence risk and preoperative pressure gradient in left ventricular outflow tract (p=0.03), age and degree of postoperative aortic insufficiency (p=0.04), age and presence of concomitant congenital heart diseases (p=0.002). Other factors including the body weight at the time of operation, postoperative pressure gradient, presence of concomitant congenital heart diseases, remoteness the membrane from the aortic valve, mitral valve lesion did not have a correlation relationship with risk of restenosis. Conclusions. The early elimination of subaortic obstruction is optimal due to high pressure gradient in LVOT may contribute to obstruction recurrence, as well as progression of aortic regurgitation. With the years subaortic obstruction leads to advancing aortic insufficiency, what correlates with the degree of aortic insufficiency in our series of patients (p=0.04). Concomitant CHD and their correction require removal of obstruction even in case of minimal systolic pressure gradient in LVOT.