Elderly dehydration

The loss of body fluids exceeds the intake of fluids, and clinically manifests as a decrease in extracellular fluid volume, ie, a low-volume state with insufficient body fluid volume. Water loss is accompanied by sodium loss. The degree of loss of the two can be different. The proportion of water and sodium loss is the same. The extracellular fluid osmotic pressure is maintained within the normal range, which is called isotonic dehydration. 320mmol / L, blood sodium 150mmol / L, called hypertonic dehydration; sodium loss and water loss, extracellular fluid osmotic pressure 280mmol / L, blood sodium 130mmol / L, said hypotonic dehydration. According to the amount of body fluid lost, dehydration is divided into three degrees, water loss of 3% to 6% of body weight is moderate dehydration, and water loss of more than 6% of body weight is severe dehydration.