Congestive Heart Failure
If the heart fails to contract normally, blood will not circulate effectively through the lungs. When the heart malfunctions, fluid and blood often accumulate in the lungs. This build-up in the lungs is congestive heart failure and can often be detected on a chest x-ray.

A wide assortment of heart problems can cause congestive heart failure and breathing difficulty. Previous heart attacks or diseases of the heart muscle may prevent normal circulation of blood into the lungs, leading to accumulation of fluid in the lungs. Narrowing or leakage of the valves of the heart may also prevent blood from flowing normally, which results in trouble catching one’s breath. Blockage and narrowing of the arteries supplying blood to the muscle of the heart (coronary artery disease) may also impair the heart’s ability to contract resulting in poor blood flow and the accumulation of fluid in the lungs (congestive heart failure).

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Helen Keller
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