2. Diagnosis of spontaneous AMI based on the universal MI definition* with randomization to occur between 12 hours and 7 days after index event presentation. (*patients with spontaneous MI event determined to be secondary to another medical condition such as anemia, hypotension, or arrhythmia OR thought to be caused by coronary vasospasm with document normal coronary arteries are not eligible; patients with clinical presentation thought to be related to Takotsubo cardiomyopathy are also not eligible)