LA County protocol requires paramedic units to contact the Base Station for all patients with suspected STEMI. There is a dedicated mobile intensive care nurse (MICN) or Base Physician 24-hours per day answering the radio, providing on-line medical direction, and maintaining a log of all patients. Outcome data is collected and available for quality improvement (QI) purposes. From the 2013 QI data, the investigators expect that approximately 70% of these patients will have a culprit lesion on catheterization, confirming a STEMI.