Heart Failure Definition
Definition
In congestive heart failure (CHF), the heart is unable to pump the necessary amount of blood throughout the body. This causes blood to back up in the veins. Fluid pools in the liver and lungs. Swelling occurs first in the feet, ankles, and legs. Then the swelling occurs throughout the body as the kidneys begin to retain fluid.
Pulmonary Edema

Fluid pooling in the lungs.
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