Distension of the renal pelvis caused by obstruction to normal urine flow?

AIIMS Nagpur NO - 2018

Medical Surgical Nursing

Easy

Appeared in: AIIMS Nagpur NO - 2018

Explanation

Hydronephrosis is the precise medical term for the dilation (distension) of the renal pelvis and calyces.
This condition is a direct result of an obstruction to the outflow of urine somewhere in the urinary tract.
The backup of urine creates pressure that causes the collecting system of the kidney to swell, as clearly depicted in the provided image.
This matches the definition in the question stem perfectly.

Option A: Renal failure is a loss of kidney function, not a structural description of swelling. It describes the inability of the kidneys to filter waste.
Option B: Renal calculi (kidney stones) are a common cause of the obstruction, not the condition of distension itself.
Option D: Polycystic kidney disease is a genetic disorder where numerous cysts grow within the kidney parenchyma, which is a different pathology from distension caused by an external obstruction.

Visual 1: Diagram: Common sites of urinary tract obstruction. This would show locations like the ureteropelvic junction (UPJ), mid-ureter (due to stones), and bladder outlet (due to an enlarged prostate), helping students visualize the causes of hydronephrosis.
Visual 2: Ultrasound Image: A real clinical ultrasound of a hydronephrotic kidney. This would show the anechoic (black) fluid-filled, dilated renal pelvis, which is a key diagnostic finding.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Obstructive Uropathy and Renal Pathology as background academic context rather than a clinical decision trigger.
A nurse caring for a patient with a urinary obstruction must monitor for signs of hydronephrosis, such as flank pain, changes in urine output (which can be decreased or paradoxically increased initially), and signs of urinary tract infection (UTI).
Key nursing interventions include pain management, meticulous monitoring of fluid intake and output, and preparing the patient for diagnostic imaging (like ultrasound or CT) or procedures to relieve the obstruction (e.g., stent placement, nephrostomy tube).
What if? If the obstruction is bilateral and complete, it becomes a medical emergency. The nurse would observe anuria (no urine output). This leads to acute renal failure, requiring immediate urological intervention to prevent irreversible kidney damage and life-threatening electrolyte imbalances.

How to Approach the Question

First, identify the key terms in the question: "Distension of the renal pelvis" and "obstruction to normal urine flow".
This is a definition-based question. Your goal is to find the medical term that matches this exact description.
Evaluate each option against the definition.
Option A, Renal failure, is a functional problem, not a structural one.
Option B, Renal calculi, is a cause, not the result.
Option D, Polycystic kidney, is a different disease process.

Concept Tested & Keywords

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