A nurse is caring for a 38-year-old client with a history of calcium oxalate kidney stones who is experiencing severe flank pain and hematuria. The client's urine output has decreased to 20 mL/hour over the past 4 hours. Which nursing intervention should be the priority?

Decreased urine output (oliguria) in this context suggests possible urinary obstruction or renal impairment, requiring immediate provider notification to prevent complications like hydronephrosis or acute kidney injury. Other interventions (analgesics, fluids, heat) are important but secondary to addressing the potential emergency.

Core Nursing Explanation Key Concept Analysis: This question tests the nurse's ability to prioritize care for a patient with nephrolithiasis (kidney stones) who is showing signs of potential acute kidney injury (AKI). The core theme is Maslow's Hierarchy of Needs and the ABCs (Airway, Breathing, Circulation), where threats to physiological function take precedence. A key pathophysiological concept is that a stone causing ureteral obstruction can lead to a backup of urine, increasing pressure in the kidney (hydronephrosis), which can damage nephrons and rapidly impair kidney function. A urine output of less than 0.5 mL/kg/hr (for an average adult, roughly

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse on a medical-surgical unit. Mr. Johnson, 38, is admitted with a diagnosis of renal colic secondary to a known calcium oxalate stone. He is writhing in bed, rating his flank pain as 9/10. He has visible blood in his urine collection bag. You check his intake and output record and note his urine output has been 20-25 mL per hour for the last two shifts.

Nursing Intervention Strategy:

1. Immediate Assessment & Notification: After confirming the low urine output, assess vital signs (hypertension could indicate renin release from kidney ischemia). Immediately call the provider or rapid response if protocol indicates. Report using SBAR: Situation (patient with kidney stone, severe pain), Background (history of stones), Assessment (oliguria of 20 mL/hr x 4 hours, severe pain, hematuria), Recommendation (request urgent evaluation, likely needs CT scan).
2. Concurrent Comfort & Safety: While waiting for orders, you can administer prescribed analgesics (if already ordered) and apply a warm pack to his flank, explaining these are for comfort while you address the more serious concern with his kidney function. Do not encourage oral fluids until obstruction is ruled out.
3. Preparation & Monitoring: Anticipate orders for stat labs (BUN, creatinine, electrolytes), a urinalysis, and imaging. Insert a second IV line if needed for contrast or fluids post-obstruction relief. Continue strict I&O monitoring every hour.
4. Patient Education & Support: Explain to the patient and family why the low urine output is a concern. Reassure them that the team is acting quickly to protect his kidney.

Patient Safety and Precautions:

• Contraindication: Do not vigorously encourage PO fluid intake in a patient with oliguria and suspected obstruction.
• Medication Caution: If NSAIDs (like ketorolac) are ordered for pain, monitor for signs of GI upset or bleeding, especially if the patient has a history of ulcers. Be aware that NSAIDs can reduce renal blood flow, so their use in potential AKI is a double-edged sword and requires close monitoring.
• Key Monitoring Points: Hourly urine output, pain level, vital signs (especially blood pressure), and for signs of infection (fever, cloudy/foul-smelling urine) which would indicate obstructive pyelonephritis—a urologic emergency.

Nursing Procedure & Medication Flow

• Urine Strainage: If not already done, strain all urine through a fine mesh filter to catch the stone for analysis. This is crucial for determining stone composition and guiding long-term prevention.
• IV Fluid Administration: If the provider orders IV fluids after obstruction is relieved, the goal is to achieve a urine output of > 2 L/day. Calculate drip rates accurately. A common order might be "0.9% NS at 150 mL/hr."
• Analgesic Administration: For severe colic, IV opioids (morphine) may be given. Administer slowly, monitor for respiratory depression and excessive sedation. Have naloxone available per protocol.

A Word from Your Senior Nurse "Nursing is not just about carrying out physician orders — it's about being the frontline guardian for your patients! In this scenario, you are the one at the bedside who connects the dots: severe pain + blood in urine + suddenly low output = potential disaster for that kidney. Your critical thinking and swift action in notifying the provider can be the difference between a temporary setback and permanent renal damage. When studying for your boards, don't just memorize 'oliguria is bad' — visualize Mr. Johnson. Ask yourself, 'What is the worst thing that could happen right now?' That clinical reasoning will make you a safe, proactive, and confident nurse."