NURS 2090 Lecture Notes - Peripheral Edema, Vasodilation, Low-Density Lipoprotein
16 Apr 2013
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Perfusion - forcing blood or other fluid to flow through a vessel and into the vascular bed of tissue to provide oxygen *affects every system of the body. Adequate ventilation and diffusion: ability to breathe in and transport o2. Intact pulmonary circulation: lower part of lung low surface tension/max blood flow/ o2. Perfusion cannot occur without inhalation/diffusion of o2. O2 enters lungs crosses alveolar cap junction pulm circ. Requires ventilation (intake of o2), perfusion (movement of o2). Ventilation-perfusion ratio (0. 8:0. 9) indicates that the rate of ventilation is slightly less than the rate of perfusion. Adequate cardiac output: optimal sv, hr, heart rhythm. Intact cardiac control center: needed to regulate hr and force of contractions. Intact coronary circulation: maintains perfusion to cardiac structures rca. Pulmonary veins carry oxygenated blood to the left side of the heart. Pulmonary artery carries deoxygenated blood to the lungs. Functions at a higher pressure to work against resistance to get to peripheral tissues.
