Chest pain is a common complication of coronary artery disease and is usually due to a lack of blood being pumped through your heart. An abnormal heart rhythm can also occur when blood isn’t flowing properly. When this happens, damage can cause the heart to beat in a strange rhythm. The most serious complications are a heart attack and heart failure. The latter occurs when the heart is suffering from a severe lack of oxygen for too long, leaving the muscle too weak to pump the amount of blood required.

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