Stress-Delta Biomarkers for Acute Coronary Syndrome Risk Stratification

Acute Coronary Syndrome (ACS) is a serious heart condition that is a leading cause of death in America. Cardiac stress testing is currently the best test to non-invasively identify which patients might be having ACS and may need more invasive testing such as a cardiac catheterization (placing a tube in the heart) for coronary angiogram (invasive mapping of the blood vessels of the heart). However, stress tests require imaging by highly trained specialists and even then may not correctly categorize a small minority of patients being evaluated for ACS. Advances in blood tests may now allow detection of the very early stages of heart blood vessel blockage via a simple blood test. The investigators seek to determine whether these blood tests can help to better identify patients with ACS. The study will also store any extra blood sample that may be left over for future use.