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Unformatted text preview: can occur, for example, when the kidneys fail to excrete sufficient amounts of sodium and water. When the fluid volume within the interstitial compartment increases, this compartment will increase in size leading to tissue swelling (i.e., edema). When excess fluid accumulates within the peritoneal space (space between the abdominal wall and organs), this is termed "ascites." Pulmonary congestion, which can occur in heart failure as the left atrial pressure increases and blood backs up in the pulmonary circuit, causes pulmonary edema. 1 Pulmonary Circulation A model that helps us to understand what causes edema is shown to the right. Filtration is the movement of fluid out of the capillary and reabsorption is the movement of fluid back into the distal end of the capillary and small venules. In most capillary systems of the body, there is a small net filtration (typically about 1% of plasma) of fluid from the intravascular to the extravascular compartment. In other words, capillary fluid filtration exceeds reabsorption...
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This note was uploaded on 04/18/2008 for the course PHYS 1010 taught by Professor Thompson during the Fall '07 term at New York Medical College.
- Fall '07
- Hydrostatic Pressure