Overview
Introduction
A patient with recurring muscle cramps, fatigue, or palpitations may have a renal electrolyte disorder rather than an isolated neuromuscular or cardiac problem.
A patient with recurring muscle cramps, fatigue, or palpitations may have a renal electrolyte disorder rather than an isolated neuromuscular or cardiac problem. The characteristic pattern is persistent potassium and magnesium depletion with metabolic alkalosis and unusually low urinary calcium, often accompanied by low or normal blood pressure despite increased renin and aldosterone. The underlying tubule defect behaves like continuous thiazide exposure. For the RN, recognition matters because ongoing replacement must be paired with renal-function review, medication safety checks, and rapid cardiac protection when electrolyte losses become dangerous.