The cause of edema (swelling) can be grouped into four general categories:
- Decrease in plasma protein concentration causes a decrease in plasma osmotic pressure.
- Increased permeability of capillary walls causing plasma protein that exit from the capillaries into the surrounding fluid interstisium more.
- Increased venous pressure, such as blood in the veins unstoppable, will be accompanied by an increase in capillary blood pressure, because they drain the contents into the venous capillaries.
- Blockage of lymph vessels causing edema (swelling), due to excess fluid in the fluid filtered out interstisium stuck and can not be returned to the blood via the lymph system.
Therapy Edema (swelling) should include treatment of the underlying cause. Reduction in sodium intake should be taken to minimize water retention. not all patients with edema (swelling) requiring pharmacologic therapy, in some patients with non-pharmacological therapies are very effective as a reduction in sodium intake (ie less than the amount excreted by the kidneys) and raise the legs above the level of the left atrium. But in certain circumstances diuretic should be administered with non-pharmacological therapies.