MMP9 and myocardial infarction: The current study examined an experimental ventricular remodeling model that resulted from infusion of exogenous MMP-9 rather than examining MMP-9 ventricular remodeling in a disease state (for example, experimental myocardial infarction [15–17] and tachycardia cardiomyopathy caused by a cardiac pacemaker [18, 19]) or caused by the injection of other drugs [20–22] (such as adriamycin [23, 24]).