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.
A.

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 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.
  • Why albumin is not a good indicator of nutritional status?

    Because of its relationship to inflammation, serum albumin is no longer considered a good indicator of malnutrition or protein repletion. However, a decreased serum albumin is considered an indicator of morbidity and mortality and persons with low albumin levels are sometimes at nutritional risk for other reasons.
  • 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.
B.

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.
C.

How does a decrease in capillary oncotic pressure cause edema?

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)
  • What is the cause of edema?

    Edema is a swelling, usually of the legs, feet, and/or hands due to the accumulation of excessive fluid in the tissues. The edema that occurs in diseases of the heart, liver, and kidneys is mainly caused by salt retention, which holds the excess fluid in the body.
  • Why do you get edema with heart failure?

    Pulmonary edema is often caused by congestive heart failure. When the heart is not able to pump efficiently, blood can back up into the veins that take blood through the lungs. As the pressure in these blood vessels increases, fluid is pushed into the air spaces (alveoli) in the lungs.
  • What is hydrostatic edema?

    Hydrostatic pulmonary edema: high-resolution CT findings. Hydrostatic pulmonary edema can be defined as an abnormal increase in extravascular water secondary to elevated pressure in the pulmonary circulation, as in congestive heart failure or intravascular volume overload.

Updated: 18th September 2018

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