Dołączył: 25 Mar 2011
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|Wysłany: Pon 9:40, 30 Maj 2011 Temat postu: Air Jordans Hemodynamic Factors Affect Blood Press
Two other hemodynamic factors affecting blood pressure are blood viscosity and bounce of the arterial wall. Increased blood viscosity, which occasions additional blood pressure, results from polycythemia,[link widoczny dla zalogowanych], one eccentric increase of RBC mass in narrative to blood plasma.
A patient's SV, the amount of blood pumped from the left ventricle during systole, is commonly about 70 ml per heartbeat. Three factors affect SV, preload,[link widoczny dla zalogowanych], afterload, and contractility.
decreased blood volume
Afterload is the pressure that causes the ventricular muscle to force the aortic valve open and mail blood into the aorta. And contractility is the ability of the myocardium to contract usually.
Preload is the compel of blood in the ventricle exerted on the ventricular muscle at the end of diastole. The extra the muscle fibers are extended during diastole, the more forcefully they'll compact during systole.
decreased systemic vascular resistance
Decreased SV usually indicates hypovolemia, increased systemic vascular resistance, or center failure. Increased SV can result from hypervolemia or decreased systemic vascular resistance.
A patient's CO, the amount of blood pumped along the ventricles each minute,[link widoczny dla zalogowanych], is usually 5 to 7 liters per minute. You can reckon CO by multiplying a patient's SV by his heart rate for 1 minute.
A decreased CO may indicate that a patient has an of these conditions:
An increased CO may indicate that a patient has one of these conditions:
Systemic vascular resistance, the measure of resistance in marginal blood containers, too plays a important role in regulating blood pressure. The vasomotor tone of the vessels primarily determines systemic vascular resistance. When vascular resistance is lofty, a patient's blood oppression mushrooms.
an intrauterine pregnancy.
Decreased elasticity of the arterial walls can also cause increased blood pressure. In numerous cases, decreased elasticity results from arteriosclerosis.
arterial or venous hindrance
Blood Viscosity and Arterial Elasticity
Various hemodynamic factors, such as SV and CO, affect a patient's blood pressure. Fluctuations of these hemodynamic factors tin also denote a related condition.
The amount of a patient's circulating blood volume influences his systemic vascular resistance. If blood stream decreases, the body compensates by increasing systemic vascular resistance, production the arteries and arterioles modify their inner diameter. A small change in the diameter of an aisle or arteriole creates a major change in systemic vascular resistance: As the vessel lumen decreases, the resistance increases. This system increases arterial pressure to nourish blood pressure as approach customary as likely. In compare, when systemic vessels dilate and systemic vascular resistance falls, blood pressure decreases
Systemic Vascular Resistance
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