# A nurse is caring for a client with a history of uric acid 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 the nurse implement first? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=541491 > language: ko > subject: Adult Health ## 문제 A nurse is caring for a client with a history of uric acid 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 the nurse implement first? ## 보기 1. Administer prescribed narcotic analgesics for pain management 2. Encourage increased fluid intake to promote stone passage 3. Notify the healthcare provider immediately about the decreased urine output **✔ 정답** 4. Strain all urine to collect stone fragments for analysis **정답: 3** ## 해설 Decreased urine output (20 mL/hour) indicates potential urinary obstruction, a medical emergency requiring immediate provider notification. Other interventions like pain management or fluid intake are secondary until obstruction is ruled out. ## 심화 해설 Priority Assessment and Intervention for Obstructive Uropathy This question requires you to apply clinical judgment to identify the most urgent threat to the client's physiological integrity. The client has a history of uric acid stones and is now presenting with severe flank pain, hematuria, and critically decreased urine output of 20 mL/hour over 4 hours. This oliguria strongly suggests a progression from simple renal colic to a postrenal acute kidney injury (AKI) due to obstruction. Pathophysiology and Clinical Reasoning The core issue is the transition from an uncomplicated stone to an obstructing stone. Uric acid stones form in acidic urine and can cause significant morbidity. When a stone lodges in the ureter, it can cause hydronephrosis and increased pressure within the renal collecting system, reducing the glomerular filtration rate (GFR). The provided case report highlights that even a small 4 mm distal ureteral calculus, which is typically expected to pass spontaneously, can lead to persistent obstruction and subsequent renal impairment [1]. In this scenario, the sharp drop in urine output to 20 mL/hour is a late and alarming sign indicating that the kidney's functional capacity is compromised. Postrenal AKI is a medical emergency because prolonged obstruction leads to irreversible nephron damage. Analysis of Nursing Interventions Using the nursing process, assessment and notification of critical changes take precedence over dependent or independent comfort and collection measures when a life-threatening complication is suspected. - **Option 1 (Administer prescribed narcotic analgesics):** Pain management is important, but it is not the first priority when the client is showing signs of acute kidney injury. Addressing the underlying cause of the obstruction is more critical to preserving renal function. - **Option 2 (Encourage increased fluid intake):** This intervention is contraindicated in the setting of a suspected complete ureteral obstruction. Forcing fluids will increase hydrostatic pressure behind the blockage, worsening hydronephrosis and pain, and accelerating kidney damage without relieving the obstruction. - **Option 3 (Notify the healthcare provider immediately):** This is the priority action. The nurse's immediate recognition and communication of the oliguria as a sign of postrenal AKI allows the provider to order urgent decompression interventions (such as stent placement or nephrostomy) to relieve the obstruction and restore renal perfusion [1]. - **Option 4 (Strain all urine):** Straining urine to capture the stone for analysis is a standard part of care for urolithiasis, but it is a secondary intervention. The immediate threat of kidney injury from obstruction overrides the need for stone collection at this moment. Test-Taking Strategy For priority questions, use the ABCs (Airway, Breathing, Circulation) and safety/risk reduction framework. A sudden drop in urine output signals a threat to the "Circulation" component via fluid volume and electrolyte imbalance, and it poses a high safety risk due to potential permanent organ damage. The first step is always to communicate a critical change in the client's status to the provider so that definitive treatment can be initiated. The source material confirms that conservative management is only appropriate in the absence of renal impairment; once obstruction leads to functional decline, a higher level of intervention is required [1]. References (research sources) - [1]A Rare but Critical Presentation in Primary Care: A Case Report on Unilateral Ureterolithiasis Leading to Postrenal Acute Kidney Injury.Case reportDorter M, Eid A, Darwish Saad N. (2026) · DOI: 10.7759/cureus.104362 ## 임상 시나리오 Obstructive Uropathy: Priority Nursing ActionRecognizing Postrenal AKI in a Patient with Urolithiasis A sharp drop in urine output to 20 mL/hour in a patient with known stones is a critical sign of postrenal acute kidney injury (AKI) from obstruction. This is a medical emergency requiring immediate provider notification. The priority is to relieve the obstruction to restore renal function and prevent irreversible nephron damage. Interventions like pain management and straining urine are secondary to this physiological threat. CautionDo not encourage increased fluid intake if an obstruction is suspected. Forcing fluids can worsen hydronephrosis, increase intrarenal pressure, and exacerbate pain without helping the stone pass. ## 핵심 개념 - **Calcium Oxalate Kidney Stones** — Most common type of kidney stone. Tends to form when consuming oxalate-rich foods (spinach, peanuts) and in a dehydrated state. - **Hematuria** — A symptom where blood is mixed in the urine. It is divided into gross hematuria, which is visible to the naked eye, and microscopic hematuria, which is only visible under a microscope. A typical symptom of kidney stones. - **Oliguria** — A condition where urine output is abnormally decreased. In adults, generally less than 400 mL per 24 hours or less than 0.5 mL/kg per hour. In this case, 20 mL per hour is a reduction close to obvious anuria. - **Hydronephrosis** — A condition where urine backs up into the kidney due to urinary tract obstruction, causing the kidney to swell. If left untreated, it can lead to permanent damage to the kidney parenchyma. - **Urinary Obstruction** — A condition where the flow of urine is blocked in any part of the kidneys, ureters, bladder, or urethra. 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