what is septal myectomy
Septal Myectomy. What is septal myectomy? Septal myectomy, also known as septal myotomy, is a cardiac surgery treatment for hypertrophic cardiomyopathy (HCM). HCM is a type of heart disease associated with asymmetric thickening of the heart muscle, most commonly at the septum (membrane that separates the right and left sides of the heart).