Circulatory Shock

Circulatory Shock - Cardiovascular System Circulatory Shock...

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Cardiovascular System Circulatory Shock * Is any state in which cardiac output is insufficient to meet the body’s metabolic needs * All forms of shock fall in to two categories * cardiogenic shock- caused by inadequate pumping by the heart usually as result of myocardial infarction Circulatory Shock * low venous return (LVR) shock has three principal forms * hypovolemic shock- * most common form * produced by a loss of blood volume as a result of hemorrahage, trauma, bleeding ulcers, burn, or dehydration * Obstructed venous return shock * occurs when something compresses vein and impedes its blood flow * ex: a growing tumor or aneurysm Circulatory Shock * Venous pooling (vascular ) shock- * occurs when the body has a normal total blood volume, but too much of it accumulates in the limbs * can result from long periods of standing or sitting or from widespread vasodilation * neurogenic shock- form of venous pooling caused by a sudden loss of vasomotor tone, allowing the vessels to dilate * can be cause by severe brainstem trauma or emotional shock Circulatory Shock Caused by Both Venous Pooling and Hypovolemic Shock * Septic shock- occurs when bacterial toxins trigger vasodilation and increased capillary permeability * Anaphylactic shock- results from exposure to an antigen to which a person is allergic which triggers release of histamine causing generalized vasodilation and increased capillary permeability Principles of Blood flow Blood flow is determined by two factors * a pressure difference between the two ends of a vessel or group of vessels * the resistance that blood must overcome as it moves through the vessel or vessels * The relationship between pressure, resistance, and flow is expressed by the equation F=P/R
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Circulatory Shock - Cardiovascular System Circulatory Shock...

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