Acute coronary syndrome (ACS) is a syndrome due to decreased blood flow in the coronary arteries such that part of the heart muscle is unable to function properly or dies. The most common symptom is chest pain, often radiating to the left arm or angle of the jaw, pressure-like in character, and associated with nausea and sweating. Acute coronary syndrome is usually caused by one of three problems: ST elevation myocardial infarction (STEMI, 30%), non ST elevation myocardial infarction (NSTEMI, 25%), or unstable angina (38%). ACS should be distinguished from stable angina, which develops during exertion and resolves at rest. In contrast with stable angina, unstable angina occurs suddenly, often at rest or with minimal exertion, or at lesser degrees of exertion than the individual's previous angina (“crescendo angina”). New onset angina is also considered unstable angina, since it suggests a new problem in a coronary artery.

In the present book, fifteen typical literatures about acute coronary syndrome published on international authoritative journals were selected to introduce the worldwide newest progress, which contains reviews or original researches on medical science, ischemic heart diseases, cardiovascular disease, epidemiology, ect. We hope this book can demonstrate advances in acute coronary syndrome as well as give references to the researchers, students and other related people.