Aortoseptal approach for optimal resection of diffuse subvalvular aortic stenosis.

The results of conventional operative resection of diffuse subaortic stenosis (tunnel subaortic stenosis and diffuse idiopathic hypertrophic subaortic stenosis) have been less than satisfactory. A new approach using the concept of aortoventriculoplasty was designed to allow adequate surgical resection of a diffuse subvalvular aortic stenosis. The aorta, the right ventricle, and the septum are incised in the same way as during aortoventriculoplasty , with the aortic anulus being divided carefully across the commissure between the left and right aortic cusps. The septotomy is extended beyond the limits of the stenosis, and fibrous and/or muscular tissue is removed from each edge of the septal incision. After adequate widening of the subvalvular area, the various incisions are closed and the aortic valve is reconstructed. This aortoseptal approach was studied experimentally in the dog and then carried out on two patients, both of whom had excellent hemodynamic and functional results. The aortoseptal approach may be the procedure of choice in the treatment of diffuse stenoses limited to the subvalvular area, whereas other procedures ( aortoventriculoplasty , and apico-aortic valved conduit) should be used when the valvular and/or supravalvular levels are involved.