Subaortic Stenosis

  • Most patients with 'Aortic Stenosis' have a narrow valve (see Aortic Stenosis). However some affected individuals have obstruction below the valve (Subaortic Stenosis). This may take the form of a localised ledge of scar tissue which restricts flow of blood out of the left ventricle. As blood passes through the narrow area a substantial amount of 'turbulence' may be created and this can damage the aortic valve itself -- sometimes leading to aortic incompetence. If the problem is severe surgery may be required to remove the ledge and sometimes to try to repair the damaged valve.


    In other patients the obstruction may result from an excess of muscle below the valve which protrudes into the left ventricle and produces narrowing with each beat of the heart. This is called Hypertrophic Cardiomyopathy (HCM) or Idiopathic Hypertrophic Subaortic Stenosis (IHSS). The overgrowth of muscle can be treated in various ways including drug therapy or surgery.