A nurse is caring for a client with stage 3 chronic kidney disease (CKD) who has been admitted with fluid overload and metabolic acidosis. Which nursing action should be the highest priority?

In stage 3 CKD with fluid overload and metabolic acidosis, hyperkalemia poses the highest immediate risk for cardiac arrest. Other interventions are less urgent.

Priority Setting in Stage 3 CKD with Fluid Overload and Acidosis

The correct answer is 1. Monitor for signs of hyperkalemia and cardiac arrhythmias. This action addresses the most immediate threat to life, which is the core principle of nursing prioritization.

The client presents with a combination of factors that create a high-risk state for lethal cardiac events. Metabolic acidosis, a common complication as kidney function declines, directly drives potassium shift. In an acidotic state, excess hydrogen ions (H⁺) move intracellularly to be buffered; to maintain electroneutrality, potassium ions (K⁺) are forced out of the cells into the extracellular fluid, raising the serum potassium level ^[1]. This transcellular shift occurs even before a significant total body potassium excess develops. The existing fluid overload further complicates the picture by diluting serum bicarbonate and reducing renal perfusion, which limits the kidneys' already compromised ability to excrete potassium [1,2].

This convergence of acidosis and reduced renal excretion makes hyperkalemia a predictable and imminent danger. The primary clinical significance of hyperkalemia is its effect on cardiac myocyte conduction. As serum potassium rises above 5.0 mmol/L, the resting membrane potential of cardiac cells becomes less negative, initially increasing excitability but quickly leading to slowed conduction and depressed automaticity ^[3]. This manifests on the ECG as peaked T-waves, loss of P-waves, and a widened QRS complex. Without intervention, this progression can rapidly deteriorate into ventricular fibrillation or asystole, which are fatal arrhythmias ^[4]. The nurse's highest priority is to detect these early electrocardiographic and clinical signs to intervene before a cardiac arrest occurs [1,4].

While the other options represent important aspects of CKD management, they do not take precedence over a potentially fatal electrolyte imbalance. Restricting protein intake to 0.6 g/kg/day is a long-term strategy to slow disease progression and reduce uremic toxin buildup, not an emergency intervention. Administering phosphate binders addresses the chronic complication of hyperphosphatemia and secondary hyperparathyroidism, which poses a long-term cardiovascular risk but is not an immediate threat. Educating the patient about renal replacement therapy is crucial for future planning as the disease advances, but it is not the priority during an acute admission for fluid overload and acidosis, where a life-threatening arrhythmia could occur within minutes [1,3].