Inclusion Criteria:  Age > or = to 18 years NSTEMI was defined according guidelines with chest pain with or without ECG modifications and significant troponin elevation (hs-cTn T *≥ 52 ng/l) or significant variation > 10 ng/l between 2 dosages between 2 or 3 hours interval) * Elecsys Roche Coronary angiography mandatory < 24 h after admission according to 2020 NSTEMI guidelines and PCI if required  Low risk NSTEMI defined with (all necessary):  Age<80 years Optimal antithrombotic therapy using new generation P2Y12 inhibitors (ticagrelor or prasugrel) or clopidogrel and aspirin with preloading at the latest before PCI Success of PCI (one or 2 arteries) Low risk of severe arrhythmia (ESC criteria) if none of the following criteria: haemodynamically unstable, major arrhythmias, LVEF <40%, failed reperfusion, additional critical coronary stenosis of major vessels, complications related to percutaneous revascularization, No major comorbidities requiring specific care Success of PCI without any event within 30 minutes after the procedure Low bleeding risk (ESC criteria) according to CRUSADE criteria validated in NSTEMI  Exclusion Criteria:  STEMI Unstable angina troponin <5ng/l* or <14ng/l with variation <4ng/l between 2 dosages )* Elecsys Roche High risk NSTEMI if one low risk criteria defined above is absent Patient with acute coronary syndromes (ACS) requiring transfer to resuscitation unit and not to intensive care unit for any reason Coronary angiography not performed or performed > 24 h after admission in ICU Pregnant or breastfeeding woman Patient unable or refusing to sign inform consent Patient without health care insurance Patient under legal guardianship