SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Illustration comparing the appearance and functioning of the heart of a healthy patient versus the heart of a patient with heart failure. The condition occurs when the heart is unable to provide sufficient pump action to maintain blood flow to meet the body's needs. It is distinguished from other heart diseases such as heart attack and cardiac arrest, which can cause heart failure but are not equivalent.
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