<prompt> Contractile dysfuncation seen in which type of cardiomyopathy?Dilated cardiomyopathyRestrcited cardiomyopathyHyperophic cardiomyopathyInfiltrative cardiomyopathy  <response>: Dilated cardiomyopathy DCM is characterized by progressive cardiac dilation and contractile systolic dysfunction, usually with concurrent hyperophy; regardless of cause, the clinicopathologic patterns are similar. DCM results in systolic contractile dysfunction. Causes include myocarditis, toxic exposures e.g., alcohol, and pregnancy. In 20 to 50 of cases, mutations affecting cytoskeletal proteins are responsible. Ref Harrison 20th edition pg 1445 