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Unstable angina is a signal that your arteries are becoming very narrow and that you could experience a heart attack. If left untreated, your unstable angina can lead to heart attack, heart failure, or arrhythmias (irregular heart rhythm). These can be life-threatening conditions.
Myocardial Infarction Causes. The main cause of both unstable angina and myocardial infarction is coronary artery disease. Coronary heart disease occurs when atheromatous plaques appear along the internal walls of coronary arteries and thus reduces blood flow to the heart.yocardial Infarction Risk Factors. Anyone can reduce risk of heart attack! Certain factors, called coronary risk factors, increase the risk of atherosclerosis. The process of atherosclerosis can be slowed by reducing these risk factors, thus reducing the risk of death or disability by myocardial infarction.