<prompt> This arrangement of myofibrils are found inDilated cardiomyopathyConstrictive cardiomyopathyFibroelastic cardiomyopathyHyperophic cardiomyopathy  <response>: Refer robbins 9e 569 Hyperophic cardiomyopathy HCM is a disease in which the hea muscle myocardium becomes abnormally thick hyperophied. The thickened hea muscle can make it harder for the hea to pump blood. Hyperophic cardiomyopathy often goes undiagnosed because many people with the disease have few, if any, symptoms and can lead normal lives with no significant problems. However, in a small number of people with HCM, the thickened hea muscle can cause shoness of breath, chest pain or problems in the heas electrical system, resulting in life-threatening abnormal hea rhythms arrhythmias. 