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5 Cards in this Set
- Front
- Back
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What is oedema? |
Accumulation of fluid in the interstitial fluid space |
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What are the 4 mechanisms by which oedema could occur? |
1) increased capillary hydrostatic pressure 2) decreased capillary oncotic pressure 3) increased capillary permeability 4) lymphatic vessel blockage |
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Explain how oedema can occur with increased hydrostatic pressure and decreased oncotic pressure. |
Increased capillary hydrostatic pressure = increased amount of fluid pushed out of the blood vessel and into the interstitial space Decreased capillary oncotic pressure = decreased amount of fluid that is drawn back into the blood vessel from the cells |
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How does increased capillary permeability contribute to oedema? |
With increased capillary permeability there is an increased amount of proteins and other molecules that are able to exit the blood vessel. Water follows the proteins via osmosis (drawing fluid out into the interstitial space) |
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How does lymphatic vessel blockage contribute to oedema? |
There is a decreased drainage/collection of excess interstitial fluid and proteins by the lymphatics leading to accumulation of fluid and proteins in the interstitial space |
