Diseases of Water Balance: Hyponatremia
Does this patient have hyponatremia? The patient has hyponatremia if the plasma sodium concentration (PNa) is < 135 meq/L. What is PNa a reflection of? PNa reflects body fluid tonicity. Metabolic processes within cells can only occur under constant conditions of the extracellular fluid (ECF) such as pH or potassium concentration. The kidneys maintain the…
