Causes of Edema. Edema may be caused by: Increased capillary hydrostatic pressure (as occurs when venous pressures become elevated by gravitational forces, volume expanded states, in heart failure or with venous obstruction) Decreased plasma oncotic pressure (as occurs with hypoproteinemia)
Also question is, what is the difference between oncotic pressure and hydrostatic pressure?
In the capillaries hydrostatic pressure increases filtration by pushing fluid and solute OUT of the capillaries, while capillary oncotic pressure (also known as colloid osmotic pressure) pulls fluid into the capillaries and/or prevents fluid from leaving.
What causes decreased oncotic pressure?
A decrease in oncotic pressure due to a low albumin level allows fluid to leak out from the interstitial spaces into the peritoneal cavity, producing ascites. A loss of albumin in the urine caused by renal dysfunction (nephrotic syndrome) can cause a decrease in the serum albumin.
What is oncotic pressure in the glomerulus?
Oncotic Pressure. Like the Starling's forces in every capillary in the body, the effect of oncotic pressure on the hydrostatic pressure must be taken into account. That is, the blood flowing into the glomerulus contains plasma proteins and blood cells that displace the water content of the blood.