RAK Nursing Officer - 2019
Medical & Surgical Nursing
Hard
A client with crush injury to the right lower leg develops ARF. A nurse interprets this type of renal failure is due to?
Appeared in: RAK Nursing Officer - 2019
Explanation
- A crush injury leads to rhabdomyolysis, which is the rapid breakdown of skeletal muscle.
- This breakdown releases myoglobin, a protein that is toxic to the kidney tubules.
- The myoglobin causes direct damage to the kidney's internal structures, specifically the tubules, leading to a condition called Acute Tubular Necrosis (ATN).
- ATN is a primary example of an intrinsic or 'renal' cause of Acute Kidney Injury (AKI), as the damage originates within the kidney itself.
Why Other Options Were Wrong
- Option A: Pre-renal causes are due to decreased blood flow to the kidneys. While a crush injury can lead to shock and hypoperfusion (a pre-renal state), the direct toxic effect of myoglobin on the tubules is the primary mechanism, making it a renal cause.
- Option C: Post-renal causes involve an obstruction of urine flow after it leaves the kidneys. A crush injury to the leg does not cause a blockage in the ureters, bladder, or urethra.
- Option D: 'Extra-renal' is not a standard medical term for classifying the causes of acute kidney injury. The standard classifications are pre-renal, renal (intrinsic), and post-renal. This option is a distractor.
Related Visual
Clinical Relevance
- Nursing practice connection: Use the key finding related to Classification of Acute Kidney Injury (AKI) to guide bedside assessment, documentation, and the next nursing action.
- Nurses must recognize that patients with crush injuries are at high risk for AKI and monitor them closely.
- Key nursing interventions include aggressive intravenous fluid administration to flush the myoglobin from the kidneys, strict monitoring of urine output (color and amount), and frequent assessment of electrolyte levels, especially potassium, which can become dangerously high (hyperkalemia).
- What if? If the patient with a crush injury also had severe blood loss leading to hypotension (low blood pressure), they would have both a pre-renal (hypoperfusion) and a renal (myoglobin toxicity) component to their AKI, complicating management.
How to Approach the Question
- First, identify the key elements in the clinical scenario: the cause ('crush injury') and the effect ('develops ARF/AKI').
- Next, recall the pathophysiological link between a crush injury and kidney failure. A crush injury causes rhabdomyolysis.
- Think about what rhabdomyolysis does: it releases myoglobin, which is toxic to the kidneys.
- Categorize this mechanism. Since myoglobin directly damages the kidney's internal structures (the tubules), this is a problem within the kidney.
- Finally, match this understanding to the standard classifications of AKI. Damage within the kidney corresponds to 'Renal' or 'Intrinsic' causes.
- Eliminate the other options: 'Pre-renal' is about blood flow to the kidney, and 'Post-renal' is about urine flow from the kidney.
Concept Tested & Keywords
- Concept Tested: Classification of Acute Kidney Injury (AKI)
- Stem keywords: crush injury, right lower leg, ARF, Acute Renal Failure
- Lead-in keywords: interprets, due to
- Clinical cues: The history of a 'crush injury' is the key clinical cue, pointing directly to rhabdomyolysis as the underlying mechanism.
Question ID
Q5kawyfnCMqjUYlje-S0pt
Reference Book
E6 Medicine Harrison 22e Part 1 p. 381-383
E6 PATHOLOGY QUICK REVIEWBased on Harsh Mohan Textbook of PATHOLOGY p. 202-204
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