11. Left Ventricular Effective Pump

11. Left Ventricular Effective Pump Power:reflects the contraction strength of effective stroke of blood of the left ventricle.
Normally, the people: 1.8 kilograms. Pump power is low, and contraction is not good, so myocardial fibers may have problems. Pump power is high, and contractility is good, so the ejected blood volume is much.
Influence Factors: Four aspects
(1) The extent of ventricular filling: In range of elasticity, the greater the degree of filling is, the stronger the contractility is; the degree of filling and the contractility are in direct proportion. If out of the limit, the myocardial expansion is large, but the contractility is reduced. Thus, the proper degree of filling is a factor influencing the contractility.
(2) The effective circulating blood volume (returned blood volume BV): The returned blood volume is little, the filling is insufficiency, and the contractility is small; the returned blood volume is much, the filling is better, and the contractility is strong.
(3) The functional status of myocardium itself: The fact whether the myocardium has lesion. For instance, myocarditis. Myocardial cells are damaged, and myocardial elasticity is reduced, so the contractility is lowered.
(4) The normal degree of blood and oxygen supply of myocardium itself: The blood and oxygen supply is insufficient, so the contractility is lowered. Myocardial Oxygen Consumption: the milliliter value of oxygen consumption of heart per minute.
12. Coronary Artery Elasticity:
The source of power of life is the heart, and the blood nourishing the body constantly flows under her impetus. However, she also demands the nourishing of blood. Coronary artery, namely three blood vessels respectively located in the heart, can supply blood and oxygen to her. The coronary artery is the artery special for supplying blood to the heart. If cholesterol and other substances are accumulated in the blood vessels, the vascular cavity will be narrower or be blocked and the blood flow will be smooth and then be blocked to cause cardiac ischemia and a series of symptoms which are coronary heart disease, namely coronary atherosclerosis. Coronary heart disease is also called as coronary atherosclerotic heart disease. The excessive fat deposition results in atherosclerosis and weakened elasticity. The mortality of human on cardiovascular and cerebrovascular diseases induced on the arterial vessel wall has exceeded 1 / 2 of the total mortality of population.
Dangerous factors making the elasticity of coronary artery weakened: high blood fat, smoking, diabetes, obesity, high blood pressure, lack of physical activity, Psychological overstrain, family history of coronary heart disease, oral contraceptive, etc.