Hypertrophic Cardiomyopathy (HCM): HCM is a common cause of sudden cardiac arrest (SCA) in young people, especially young athletes. It is very common and can affect anyone regardless of age. When heart muscle cells enlarge and cause the walls of the ventricles (generally the left ventricle) to thicken, what results is Hypertrophic Cardiomyopathy . It is an inherited disease of your heart muscle, where the muscle wall of your ticker becomes thickened. Although the ventricle size often remains normal, but the thickening may block blood flow out of the ventricle, this condition (if happens) is called obstructive hypertrophic cardiomyopathy. The septum (wall that divides the left and right side of the ticker) sometimes thickens and bulges into the left ventricle which can block blood flow out of the ventricle causing the ventricle to work hard to pump blood. Chest pain, dizziness, shortness of breath, or fainting are some of the symptoms. HCM also can affect the mitral valve of the...