A nurse is caring for a patient who underwent a radical nephrectomy for renal cell carcinoma 24 hours ago. Which nursing intervention is the priority for this patient?

Monitoring urine output and assessing for acute kidney injury is the priority because the remaining kidney must compensate for the lost renal function, and early detection is crucial for patient safety. Other interventions are important but secondary to preventing life-threatening renal failure.

Understanding the Priority Post-Nephrectomy
After a radical nephrectomy, the remaining kidney must immediately assume the full filtration and excretory workload. The most critical physiological threat in the first 24 to 48 hours is acute kidney injury (AKI), a sudden deterioration of kidney function diagnosed by a rise in serum creatinine or a decrease in urine output ^[2]. In urological surgery, AKI can result from direct surgical manipulation, vascular compromise, or obstruction, and it remains a frequent and serious complication ^[1][2].

Why Monitoring for AKI is the Priority
The remaining kidney's ability to function is not guaranteed. Research on renal surgery consistently highlights the substantial risk of AKI regardless of the surgical approach used ^[4]. A prospective study on robotic renal surgery found that early detection of AKI using biomarkers is critical for predicting medium-term renal function outcomes at 12 months ^[4]. If AKI develops and is not identified promptly through hourly urine output monitoring, the patient can rapidly progress to fluid overload, electrolyte imbalances, and uremic complications. This makes functional assessment the physiologic priority over pain control, mobility, or psychosocial support in the immediate postoperative phase.

Analyzing the Other Options
While the other interventions are important, they do not take precedence over a direct assessment of the remaining organ's viability.
- Option 1 (Early ambulation): Preventing deep vein thrombosis is a standard postoperative goal, but ambulation is typically initiated after hemodynamic stability and adequate pain control are established, not within the first strict monitoring window where organ function is the primary concern.
- Option 3 (Administering analgesics): Pain management is essential for patient comfort and facilitating deep breathing, but administering narcotics before establishing baseline renal function can be dangerous. Impaired renal clearance can lead to the accumulation of active drug metabolites, causing respiratory depression or toxicity.
- Option 4 (Emotional support): Addressing body image changes related to a surgical scar or organ loss is a psychosocial need that is addressed later in the recovery continuum, once physiological stability is secured.

Clinical Application of the Evidence
The management of AKI in urology centers on correcting the underlying cause, which in this context involves ensuring adequate renal perfusion and patency of the urinary drainage system ^[2]. The nurse’s priority assessment of urine output—often aiming for a minimum of 0.5 mL/kg/hr—provides real-time data on glomerular filtration rate. A sudden drop in output or anuria is a critical alert that requires immediate intervention to prevent irreversible damage to the solitary kidney. This monitoring directly aligns with the KDIGO criteria used in clinical trials to define and stage AKI, which rely on changes in urine output and serum creatinine ^[4].