The heart is always at work. Hemodynamics refers to blood flow. Any obstruction to the flow of blood in and around the heart, may lead to failure. The heart is about the size of a folded fist and works to pump blood to all the body's tissues. Poor circulation may occur for a number of reasons. The patient in heart failure, is at risk for stroke. Myocardial infarction The heart is a pump, which pumps blood around the body. If there is damage, like a myocardial infarction, the heart's function will be impaired. A MI (myocardial infarction ) is also known as a heart attack. It results from obstruction to blood flow. Fatty deposits may cause this. Death of the heart muscl e surrounding the obstructed blood vessel will result. Symptoms such as lack of oxygen, shortness of breath and chest pain will occur. Learn more about : The EKG , Diabetic Retinopathy This condition affects the blood vessels in the eye. Poor vision and possible blindness may r...