Since the seventies, and in particular the eighties of this century, findings on pathogenetic mechanisms of ischaemic heart disease are expanding markedly and are becoming more accurate. This makes it possible to know and understand better factors which influence the genesis and development of myocardial ischaemia including the most serious clinical forms (unstable angina pectoris, acute myocardial infarction and sudden cardiac death). Diminution of the cardiac flow and/or increased oxygen demands of the heart muscle are not the only determinants of myocardial ischaemia which is influenced markedly also by neurohumoral, metabolic, prothrombotic (proaggregation and procoagulation) factors as well as antithrombotic and haemodynamic factors. Acute coronary syndromes have as a rule, in particular in patients with out severe atherosclerotic stenosis of the coronary arteries, a common pathophysiological mechanism of fissuration of the atherosclerotic plaque followed by different grades of dynamic coronary occlusion depending on vasoconstriction--spasm of the coronary arteries and thrombus formation. The coronary arteries, usually affected with atherosclerosis, may be due to the comprehensive action of various factors temporarily, intermittently or permanently occluded. In case of the development of acute coronary syndromes thrombosis plays a key role. Better knowledge of pathogenetic mechanism of IHD markedly changes views on treatment and management of patients with IHD in particular patients with acute coronary syndromes. The authors emphasize strategies focused (also preventively) on preventing progression of the disease with the aim to improve survival and the short-term and long-term prognosis.