FIELD: medicine. SUBSTANCE: method involves excising zone of predominating interventricular septum hypertrophy in the middle of the interventricular septum corresponding to intraventricular left ventricle obstruction level. Excision is carried out from the right cardiac ventricle cavity directly forward from the offset of moderator band to the place of interventricular septum transition to the anterior wall of the right ventricle without penetrating into the left cardiac ventricle cavity. Cardiac activity is restored in keeping the right ventricle open. Required residual excision of the hypertrophic muscle tissue is carried out under transesophageal echocardiography control in obstruction zone determined by interventricular septum thickness reduced to optimum value, intraventricular pressure gradient and improved left ventricle function. Incision in the right ventricle wall is covered with continuous atraumatic suture. EFFECT: enhanced effectiveness of treatment. _
