Coronary heart disease is by far the most common cause of death in many countries. For example, every few seconds someone in Europe is suffering of chest pain caused by an insufficient supply of blood to the heart.
While a short-term oxygen scarcity usually origins angina pectoris, a long-term severe lack of oxygen causes a myocardial infarction, which may eventually lead to a cardiac arrest. Therefore it is very important to identify a heart attack and immediately seek for medical attention. However heart attack victims can wait on average two hours or more after the beginning of symptoms before they seek medical help but sadly it might be already too late then.
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