A nurse is assessing a patient with suspected hydronephrosis. Which assessment finding would be most indicative of this condition?

When a patient presents with suspected hydronephrosis, the nurse's physical assessment is critical for early recognition. The hallmark finding is flank pain that intensifies with movement, coupled with a palpable kidney mass. This occurs because an obstruction blocks urine outflow, causing back-pressure that stretches the renal capsule.

1. Pain Characterization: Ask the patient to describe the location and quality of pain. Hydronephrosis typically produces a dull, constant ache in the flank or costovertebral angle (CVA). Document if the pain worsens with ambulation or position changes, as movement can shift an obstructing stone or increase intra-abdominal pressure.
2. Deep Palpation: With the patient supine, gently palpate the abdomen and flank. An enlarged, fluid-filled kidney may be felt as a smooth, firm mass. Avoid aggressive palpation if a tumor is suspected. Compare bilaterally, noting any asymmetry or tenderness.
3. CVA Tenderness Assessment: Place one hand flat over the costovertebral angle and strike it with the ulnar surface of your other fist. Significant pain upon percussion strongly suggests renal inflammation or capsular distension.

• Monitor Output: Strict intake and output records are essential. While output may be normal or decreased, sudden anuria suggests complete obstruction, a urological emergency.
• Infection Surveillance: Urinary stasis predisposes to infection. Monitor for fever, chills, and cloudy or foul-smelling urine. Obtain a urinalysis and culture as ordered.
• Pain Management: Administer analgesics as prescribed, typically NSAIDs for renal colic, and position the patient for comfort. Avoid heavy sedation before a definitive diagnosis is made.
• Prepare for Imaging: Anticipate orders for a renal ultrasound or non-contrast CT scan to confirm the diagnosis and locate the obstruction level. Ensure the patient understands NPO requirements if contrast is needed.

Clinical Pearl: A palpable kidney in an adult is abnormal and warrants immediate reporting. Coupled with movement-aggravated flank pain, it is a high-yield indicator of significant obstruction requiring prompt decompression to preserve renal function.