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The heart is a beating muscle that pumps oxygen and nutrient-rich blood to the body via the circulatory system. Inside the heart are four chambers which collect blood and then redistribute it to the lungs and body.

Several conditions can impair the heart’s ability to effectively circulate blood.

Defects or diseases of heart muscle or valves can cause failure of the heart to maintain an adequate blood circulation. Coronary artery disease, high blood pressure, or narrowed or ... more