MPO and myocardial ischemia: The decrease of infarct volume after myocardial ischemia/reperfusion injury in rats treated with cornuside (6) has been assigned to the reduction of polymorphonuclear leukocytes infiltration, myeloperoxidase (MPO) activity and malondialdehyde (MDA) production in myocardial tissue as well as lower serum-levels of pro-inflammatory mediators (Jiang et al., 2011).