Patients with UA and/or non-STEMI typically present with unstable chest pain or angina pectoris. The discomfort is often described as a burning or pressurelike sensation in the midprecordium. It can also be described as a heavy symptoms Epidemiology R. Scott Wright, MD, FACC, FESC, FAHA Pathophysiology Clinical Diagnosis © 2008 BC Decker Inc 12/08