Nitric Oxide in Myocardial Infarction Size

Inclusion Criteria: * Acute myocardial infarction and electrocardiographic evidence of ST elevation * No clinical evidence of congestive heart failure * All patients must undergo successful percutaneous coronary intervention for thrombolysis in myocardial infarction (TIMI) 0 or 1 coronary flow with resulting TIMI 2 or 3 flow * Greater than 18 years of age * Signed Institutional Review Board (IRB) approved informed consent Exclusion Criteria: * Prior myocardial infarction * Requirement for urgent cardiac surgery * Previous coronary artery bypass graft (CABG) or primary coronary intervention (PCI) * Left bundle branch block * Heart block that is expected to require a temporary pacemaker for greater than 72 hours * Prior use of thrombolytic therapy for the current event * Unable to tolerate magnetic resonance imaging or unable to tolerate gadolinium contrast media, including patients with a calculated creatinine clearance less than 60 ml/min/1.73m² Body Surface Area (BSA) * Active or recent hemorrhage requiring an invasive procedure for evaluation or transfusion within 6 weeks prior to presentation, or hemorrhagic stroke within the 6 weeks prior * Neutropenia (WBC \<2000 (mm)³), Anemia (HCT \<30%, Thrombocytopenia (Thrombocytes \<50,000 (mm)³). It is not necessary to confirm blood counts prior to start of study drug in the absence of clinical suspicion. * Known or suspected aortic dissection. * Prior history of pulmonary disease requiring chronic oxygen therapy. * Pregnancy, lactating, and women of childbearing potential. * Medical problem likely to preclude completion of the study. * Use of investigational drugs or device within the 30 days prior to enrollment