CD4 and ST Elevation Myocardial Infarction: A separate clinical investigation reported that CD4+CD28null T-cell expansion is found in ST-elevation myocardial infarction (STEMI) but not non-ST-elevation myocardial infarction (NSTEMI) patients, and that the counts of these cells were dramatically reduced after 72 hours of rosuvastatin treatment, an effect that persists up to 42 days in patients with initially elevated CD4+CD28null T-cell counts (13).