<prompt> In myocardium reperfusion injury is due to?CaMgKMn  <response>: Ans. a CaRef: Gross GJ, Kersten JR, Warltier DC. Mechanisms of postischemic contractile dysfunction. Ann Thorac Surg. 1999; 68:1898-1904.Mediators of reperfusion injury are: Oxygen Free Radicals, Endothelial Dysfunction and Microvascular Injury, Alterations in Calcium Handling 