Extracellular fluid volume expansion via isotonic electrolyte replacement with buffer-mediated acid-base stabilization

The term refers to a clinical intervention in which **isotonic electrolyte solutions** (such as normal saline or balanced crystalloids) are administered to expand the extracellular fluid compartment, restoring circulating blood volume and correcting fluid deficits (e.g., hypovolemia, dehydration, or shock). These solutions may contain *buffers* (such as lactate, acetate, or bicarbonate) that are metabolized to bicarbonate, thereby stabilizing acid-base balance in cases of metabolic acidosis. This process is foundational in emergency, surgical, and critical care medicine, but is *not* a single therapeutic "target" at the molecular or receptor level—instead, it describes supportive care using defined fluid products with well-characterized electrolyte and buffer contents[1][2][5].

Other names

Extracellular fluid (ECF) expansion with isotonic fluidsIsotonic electrolyte replacement therapyBuffer-mediated acid-base correction

Restores circulating extracellular volume through isotonic infusion Replaces lost electrolytes (mainly sodium, chloride, sometimes potassium, calcium) Provides buffer anions (like lactate, acetate, bicarbonate) that are metabolized to bicarbonate, stabilizing blood pH and correcting metabolic acidosis[1][2][5]