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Heart is also a muscle which requires a blood supply so when the blood supply is cut off to the heart muscle then you experience heart attack. So these blockage happens in the coronary arteries. Coronary arteries is the one that supplies the heart. So any block in the coronary arteries you get heart attack, that means patient will experience severe sweating, headache, if there is a massive heart attack, that can lead to cardiac arrest also. Cardiac arrest is not heart attack where the heart stops functioning, but in heart attack the heart starts beating still, unless it is a massive heart attack where the patient will lead to cardiac arrest and other complications. Heart failure is one condition where the heart fails to pump blood to the complete body. So this is a very chronic condition, it can happen suddenly or it can happen due to any other causes like even severe heart attack can produce heart failure or you can develop chronic congestive cardiac failure where you can feel that the heart is not bale to pump blood to the body and most of the blood is entering the lungs and the patient can get into congestive cardiac failure and pulmonary edema. So heart failure is a serious condition where nowadays a lot of procedure is being done, medical management, even though biventricular pacings. Currently the trend is to do transplants for chronic heart failures.
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