Infrasensor for Early Detection of a High-grade Obstructive NSTE-ACS

Inclusion Criteria: * Subject is willing and able to sign an Informed Consent * Age: ≥18 years * Study subjects with symptoms suggestive of ACS within 24 hours of presentation in an emergency department or acute care setting in whom invasive coronary angiography is intended. * The following conditions for Infrasensor use must be present: The Infrasensor should only be used on alert patients who are able to keep the device still for the 5 minute measurement duration, who have clean, intact skin at the measurement site, and who do not have blood pressure cuffs, IV lines, or other medical equipment on the arm used for measurement. Exclusion criteria: * Patients with scars, open wounds, or lesions that may interfere with the Infrasensor application * ACS patients triaged directly with STEMI or for cardiac reasons other than suspected AMI requiring immediate medical intervention (aortic dissection, unstable cardiac arrhythmias) * Patients in whom an obvious alternative diagnosis is suspected at the time of arrival to hospital and without suspicion of ACS (pulmonary hypertension, musculoskeletal chest pain) * Patients with acute myocardial infarction, percutaneous coronary intervention (including coronary stent placement), and/or coronary artery bypass graft surgery within the past 30 days * Patients being hospitalized for acute coronary syndrome including NSTEMI who have hemodynamic instability (e.g., cardiogenic shock, unstable arrhythmias) * Patients with planned coronary revascularization procedures (PCI or CABG) during the study period including patients who were evaluated previously for NSTEMI and determined to undergo a planned cardiac catheterization on an outpatient basis at a future time point. * Hemodynamically unstable patients as defined by institutions protocol * Trauma patients * Patients with acute hemorrhage patients