Tissue fluid exudation

Introduction The tissue fluid is produced by the filtration of blood through the capillary wall, and the amount of production depends mainly on the effective filtration pressure. The effective filtration pressure of the tissue fluid is generated = (capillary pressure + tissue fluid colloid osmotic pressure) - (plasma colloid osmotic pressure + tissue fluid hydrostatic pressure). Since the blood pressure in the capillaries of the proximal arteriole is higher than that of the capillaries in the proximal venous, the tissue of the capillary artery is filtered out, and the tissue at the vein is reabsorbed. In addition, a small amount of tissue fluid enters the capillary lymphatic vessels and forms lymph fluid.

Cause

(1) The effective filtration pressure is increased.

(2) Increased capillary permeability.

(3) Increased venous and lymphatic reflux.

an examination

Related inspection

Lymphocyte count (LY) blood routine

Clinical symptoms of edema can occur.

Differential diagnosis

Edema refers to excessive accumulation of body fluids in the extravascular tissue space, which is one of the common clinical symptoms. Unlike obesity, edema is characterized by a significant depression when the finger presses a small area of the subcutaneous tissue (such as the anterior side of the calf). The motherland medicine called it "water vapor", also known as "edema." Edema is a common pathological process in which the accumulated body fluid comes from plasma, and its ratio of sodium to water is approximately the same as that of plasma. Habitually, the accumulation of excessive body fluids in the body cavity is called stagnant water or effusion, such as pleural effusion, ascites, and pericardial effusion.

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