Place of Copeptin-troponin Assay in the Elimination Diagnosis of Non-ST+ ACS

Inclusion Criteria: * Patient ≥18 years old * Presenting at the Pontoise emergency department by their own means / ambulance or patients taken care of by the SMUR and referred to the NOVO hospital - Pontoise site * Chest pain less than 6 hours old * Chest pain suggestive of ACS (compressive, intense pain, radiating into the arm and neck, mid-thoracic, left thoracic or epigastric location) * Non-contributory ECG (no ST elevation, presence of bundle branch block) * Informed and having expressed no objection * Beneficiary of a social security system (or entitled person) Non -Inclusion Criteria: * Sus ST-segment shift on ECG (ACS ST+) * Intermittent pain/unclear onset time * Pregnant woman * Pain in the context of trauma * Patient under guardianship * Patient does not speak or understand French Exclusion Criteria: * Non-ultrasensitive troponin measurement positive during the 1st SMUR sampling (\> 0.08 ng.dL) * Patient not referred to the NOVO hospital - Pontoise site by the SMUR