The FINANCIAL -- AstraZeneca (NYSE: AZN) on November 16 announced results of a PLATO sub-analysis in the most serious type of Acute Coronary Syndrome (ACS) patients, those with ST Segment Elevation Myocardial Infarction (STEMI). In this setting, ST segment elevation indicates total obstruction of a coronary artery which warrants emergency surgery with angioplasty, a procedure termed primary Percutaneous Coronary Intervention or “PCI,” in order to restore flow, salvage the heart muscle (myocardium) from infarction, and reduce mortality.