<qa>  What is the typical method of stenting the vessel?Single center study involving 140 patients randomized to Post Conditioning Percutaneous coronary intervention PCI versus routine PCI during their ST-Elevation Myocardial Infarction STEMI, Heart Attack presentation. The Post Conditioning protocol consists of performing four, 30-second PTCA Angioplasty balloon occlusions followed by 30-seconds of reperfusion over a total of 4 minutes. The first balloon inflation occurs immediately after an angioplasty guidewire is placed through the obstruction in the artery. Following this protocol the vessel is stented as part of the usual practice for treatment of STEMI. No other treatment differences will occur between the two groups and all patients will receive the usual post-STEMI care. Patients in both groups will receive a cardiac MRI 3-5 days following their STEMI for measurement of heart attack size and heart muscle function, among other measures. Patients will undergo collection of blood for CK MB and troponin I every 8 hours for 24 hours following PCI. All patients will be followed by phone follow-up visits to review history and MACE death, recurrent STEMI, repeat revascularization, arrhythmias, ICD placement and hospitalization for CHF. All patients will be required to take P2Y12 inhibitors and aspirin for the duration of the trial. All patients will be treated with ACEI, beta blockers and statins. 