Volume expander

Volume expanders are a group of substances that increase the blood volume in an organism. They are used in the treatment of shock and hypovolemia. Volume expanders can be classified into two categories: crystalloid and colloid solutions.

Crystalloid Solutions

Crystalloid solutions are aqueous solutions of mineral salts or other water-soluble molecules. They are used to replace lost fluids and promote urine production. The most commonly used crystalloid solution is normal saline, which is a solution of sodium chloride at 0.9% concentration in water. Other examples include Ringer's lactate and dextrose solution.

Colloid Solutions

Colloid solutions contain larger insoluble molecules, such as gelatin, dextrans, hydroxyethyl starches, and albumin. These solutions stay in the circulatory system longer and therefore expand the blood volume more effectively. However, they are more expensive and may have more side effects.

Uses

Volume expanders are used in the treatment of shock, hypovolemia, and other conditions that cause a decrease in blood volume. They are also used during surgery to replace lost fluids.

Side Effects

Possible side effects of volume expanders include allergic reactions, kidney damage, and blood clotting disorders. The risk of side effects can be reduced by careful monitoring of the patient's condition and adjustment of the dosage.

See Also

• Intravenous therapy
• Blood transfusion
• Fluid replacement