An Alcohol Septal Ablation is a minimally-invasive treatment performed by an Interventional Cardiologist to relieve symptoms and improve the functional capacity in symptomatic patients with hypertrophic cardiomyopathy (HCM). Hypertrophic cardiomyopathy is a condition of the heart whereby the heart muscle grows abnormally thick without any obvious cause (such as high blood pressure). This abnormal thickening of the heart muscle can make it harder for the heart to pump blood around the body.