Ischemic heart disease and cardiovascular diseases in general are among the leading causes of death globally. Furthermore, acute coronary syndrome is often an emergency encountered by an outpatient emergency team. Emergency medical interventions require prompt and competent judgment, and this largely depends on the team's readiness and expertise. The outcome of the intervention is also influenced by the early recognition of symptoms by the patient, in order to seek medical help in a timely manner and thus ensure a favorable outcome of treatment. This paper describes the treatment of a patient with acute coronary syndrome from symptom recognition to transport to a hospital. The operation of the ambulance is organized through teams T1 and T2, which differ in roles and competencies. The first part of the paper presents the basics of anatomy and physiology of the heart as well as the basics of pathophysiology in acute coronary syndrome. An electrocardiogram (ECG) showing cardiac activity is described, and some parts of the ECG are explained. The terminology and division of acute coronary syndrome is explained; clinical picture, epidemiology and etiology of angina pectoris and acute myocardial infarction and diagnostic procedures. The care of a patient with acute myocardial infarction in field conditions, transport and potential complications of acute myocardial infarction are described. Also, the role of the medical reporting unit was discussed. In the last part of the paper, the statistical data of the Institute of Emergency Medicine of Međimurje County for the period from 2018 to 2021 are presented. The total number of patients with acute myocardial infarction, a comparison of patients by gender, and a comparison of the total number of interventions and those performed in the "golden hour" are presented.