Fluid infusion in emergency resuscitation is very important, so the choice of infusion fluid also needs to be carefully considered. In fact, the choice of infusion fluid in resuscitation has been a long-standing debate, so depending on each patient's case, there will be appropriate indications for infusion fluid.

Colloids are solutions composed of homogeneous macromolecules and not crystals or microscopic particles dissolved in another substance. Colloids can be classified as blood-derived solutions such as albumin, plasma proteins, and fresh frozen plasma, semisynthetic (hydroxyethylstarch-HES), dextrans or gelatins.