Assertion: heart failure's cause | /r/Causes | a heart attack
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text: The most important causes of heart failure are coronary artery disease (which causes a heart attack) and high blood pressure, but it can also be the result of damage to the heart muscle itself (cardiomyopathy), problems with the valves (such as “aortic stenosis”) or when the heart’s rhythm is disturbed and it beats too fast, too slow or irregularly (“atrial fibrillation”).