Copeptin and Acute Coronary Syndrome Without ST-segment Elevation

"Patients with hyponatremia \< 135 mmol/L or troponin \> 1 μg/L are released study.~Blood sampling are taken for Troponine T, myoglobin, creatin kinase and copeptine analysis and 18-lead ECG was performed after 2, 4, 6 and 12 h.~Copeptin and myoglobin are measured at the end of the patients inclusion, after to be centrifugrd end frozen at -80°C at each time point.~The treatment of patients is not modified by the study. At 90 days, clinicals and paraclinicals events are collected"