<prompt> Acute coronary syndrome is associated with all EXCEPTUnstable anginaStable anginaSTEMINSTEMI  <response>: B Stable angina Unstable Angina Non-ST-elevation Myocardial Infarction: Patients with ischemic heart disease fall into two large groups: patients with stable angina secondary to chronic coronary artery disease and patients with acute coronary syndromes ACS. Latter group, in turn, is composed of patients with acute myocardial infarction Ml with ST-segment elevation on their presenting electrocardiogram STEMI and those with unstable angina UA and non-ST-segment elevation Ml UANSTEMI. Every year in the United States, 1.4 million patients are admitted to hospitals with UANSTEMI as compared with 400,000 patients with acute STEMI. The diagnosis of UA is based largely on the clinical presentation. Stable angina pectoris is characterized by chest or arm discomfort that is rarely described as pain, but that is reproducibly associated with physical exertion or stress and is relieved within 5 to 10 min by rest andor sublingual nitroglycerin. UA is defined as angina pectoris or equivalent ischemic discomfort with at least one of three features:1 it occurs at rest or with minimal exertion usually lasting 10 min,2 it is severe and of new onset i.e., within the prior 4 to 6 weeks, andor3 it occurs with a crescendo pattern i.e., distinctly more severe, prolonged, or frequent than previously. The diagnosis of NSTEMI is established if a patient with the clinical features of UA develops evidence of myocardial necrosis, as reflected in elevated cardiac biomarkers. 