Electrolyte and acid–base balance

Electrolyte and acid–base balance refers to the precise regulation of the concentrations of essential ions—such as sodium, potassium, calcium, and bicarbonate—and the maintenance of the body's pH within a narrow physiological range (StatPearls, NBK507807). This balance is vital for maintaining osmotic pressure, conducting nerve impulses, and ensuring the proper folding and function of proteins and enzymes (StatPearls, NBK541123). The primary regulatory organs are the kidneys, which control the excretion and reabsorption of ions, and the lungs, which manage carbon dioxide levels to influence blood pH (Merck Manual). Although electrolyte and acid–base balance is a physiological process rather than a single molecular target, it is the focus of numerous pharmacological interventions. Drugs such as diuretics, ion-exchange resins, and mineralocorticoid receptor antagonists work by modulating specific transporters and receptors to correct imbalances. Disruptions in this system, such as metabolic acidosis or hyperkalemia, are common in clinical settings like chronic kidney disease and heart failure and can lead to severe complications, including cardiac arrest or coma.

Other names

Acid-base homeostasisFluid and electrolyte balanceElectrolyte homeostasisAcid-base status

Pharmacological agents modulate this balance by targeting specific molecular entities such as the Na-K-2Cl cotransporter (NKCC2), sodium-chloride symporter (NCC), carbonic anhydrase enzymes, or vasopressin receptors to alter the renal processing of electrolytes and water (StatPearls, NBK541123).