The criteria for AMI are met when there is:
- A rise and/or fall of cardiac biomarkers (typically troponin)
at least one of the following:
- Symptoms (e.g., pain, shortness of breath, sweating, nausea, tachycardia)
- Suggestive electrocardiographic (ECG) changes (or imaging evidence of new loss of viable myocardium or new regional wall motion abnormality)
If ischemia is present, necrosis will likely follow if the tissue is not oxygenated immediately. For this reason, cardiac testing is often ordered stat. In medicine, there is a saying that "time is myocardium". In other words, the longer a patient waits before their coronary blood flow is restored, the more heart tissue will die. The more necrosis, the more morbidity and mortality associated with the cardiac event.
