Lose a lot of digestive juices and only replenish water

Just replenish water after sweating profusely

Extensive burn wounds lose large amounts of body fluids

Kidney sodium loss

Plasma osmolality <280mmol/L Serum sodium concentration <135mmol/L

Decreased extracellular fluid, more sodium loss than water loss

shock

dehydration

Brain cell edema

urine output

Urine sodium

Increased extracellular fluid volume

Plasma osmolality <280mmol/L Serum sodium concentration <135mmol/L

Too much water intake exceeds the ability of the kidneys to drain it

Reduced water discharge

Water flows from outside the cells into the cells, causing edema

The amount of extracellular fluid is basically normal

Plasma osmolality <280mmol/L Serum sodium concentration <135mmol/L

Syndrome of abnormal ADH secretion (SIADH)

Abnormally increased ADH, increased blood volume, decreased aldosterone, and increased drainage and sodium excretion

Mild and no obvious symptoms on the body

Serum sodium concentration>150mmol/L Plasma osmolarity>310mmol/L

Reduced body fluid volume, with more water loss than sodium loss

Not enough water

Too much water loss

Thirsty

Oligouria

Transfer of intracellular fluid to extracellular fluid

dehydration of brain cells

Urine sodium

dehydration fever

Isotonic fluid loss caused by massive drainage of pleural effusion, large area burns, vomiting, etc.

Main loss of extracellular fluid

The fluid exchange inside and outside the capillaries is imbalanced and the production of tissue fluid increases.

Imbalance in fluid exchange between the body and the outside