Pre renal failure occurs in

Appeared in: JIPMER Nursing Officer-2017

Explanation

Pre-renal failure is defined by reduced blood flow (hypoperfusion) to the kidneys, which impairs their function without causing direct structural damage initially.
Heart failure is a condition where the heart cannot pump enough blood to meet the body's needs, resulting in decreased cardiac output and systemic blood pressure.
This reduction in overall blood circulation directly leads to decreased renal perfusion, causing pre-renal acute kidney injury.

Option B: Nephrolithiasis (kidney stones) causes a physical blockage in the urinary tract, which prevents urine from leaving the kidneys. This is classified as post-renal failure.
Option C: Toxic nephropathy involves direct damage to the kidney's parenchymal tissue (specifically the tubules) by toxins. This is a form of intra-renal (intrinsic) failure.
Option D: Glomerulonephritis is inflammation and damage to the glomeruli, the filtering units within the kidney. This is a direct injury to the kidney, making it a cause of intra-renal (intrinsic) failure.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification and causes of Acute Kidney Injury (AKI), specifically pre-renal failure as background academic context rather than a clinical decision trigger.
Nurses must meticulously monitor vital signs (especially blood pressure), fluid intake, and urine output in patients with heart failure to detect early signs of pre-renal AKI.
A key nursing intervention is to promptly report a drop in urine output to less than 0.5 mL/kg/hr, as this is a critical indicator of renal hypoperfusion and impending AKI.
What if? If a patient presented with AKI after undergoing a procedure with intravenous contrast, the most likely cause would be intra-renal failure (contrast-induced nephropathy) due to direct toxic damage to the tubules, not pre-renal failure.

How to Approach the Question

First, identify the key term in the question: 'Pre-renal failure'.
Recall the definition of the three types of renal failure: Pre-renal (before the kidney, related to blood flow), Intra-renal (inside the kidney, related to tissue damage), and Post-renal (after the kidney, related to obstruction).
Evaluate each option based on this classification.
Heart failure affects blood circulation to the kidney, matching the 'pre-renal' definition.
Nephrolithiasis is an obstruction after the kidney, making it 'post-renal'.
Toxic nephropathy and glomerulonephritis are damage inside the kidney, making them 'intra-renal'.

Concept Tested & Keywords

Concept Tested: Classification and causes of Acute Kidney Injury (AKI), specifically pre-renal failure.
Stem keywords: Pre renal failure
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 511-513

E6 Medicine Harrison 22e Part 1 p. 381-383

E6 Medicine Harrison 22e Part 2 p. 284-286

Practise the full JIPMER Nursing Officer-2017

Attempt every question from this paper in a timed mock, then review the full solution for each one.