NORCET -4 , 2023
Medical Surgical Nursing
Easy
The clinical finding polyuria would not be seen in?
Appeared in: NORCET -4 , 2023
Explanation
- Glomerulonephritis is an inflammatory condition affecting the glomeruli, the primary filtering units of the kidneys.
- This inflammation leads to a decreased glomerular filtration rate (GFR), which means less fluid is filtered from the blood into the urine.
- The characteristic finding in glomerulonephritis is a reduced urine output, known as oliguria (less than 400 mL/day), not polyuria (excessive urine output).
- Other classic signs include hematuria (blood in urine), proteinuria (protein in urine), edema (swelling), and hypertension.
Why Other Options Were Wrong
- Option A: Diabetes insipidus is a classic cause of polyuria. It results from a deficiency of antidiuretic hormone (ADH) or renal resistance to ADH, leading to the excretion of large volumes of dilute urine.
- Option B: Diabetes mellitus is a common cause of polyuria. The high blood glucose levels lead to glucose spilling into the urine, causing osmotic diuresis where water is pulled into the tubules, increasing urine volume.
- Option D: While not as consistent as in diabetes, polyuria can be a feature of chronic pyelonephritis. The chronic inflammation and scarring can damage the renal tubules, impairing their ability to concentrate urine.
Related Visual
- Visual 1: Table: Comparison of Polyuria, Oliguria, and Anuria, defining each term and listing common causes.
- Visual 2: Diagram: Pathophysiology of Glomerulonephritis, showing how glomerular inflammation reduces GFR and leads to oliguria, edema, and hypertension.
- Visual 3: Flowchart: Differentiating causes of polyuria, distinguishing between osmotic diuresis (e.g., Diabetes Mellitus) and water diuresis (e.g., Diabetes Insipidus).
Clinical Relevance
- Nursing practice connection: Knowing Pathophysiology of renal diseases and their effect on urine output helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Monitoring urine output is a fundamental nursing assessment. A significant change, whether an increase (polyuria) or decrease (oliguria), is a critical indicator of a patient's fluid status and renal function.
- For a patient with new-onset polyuria, a nurse should assess for other signs of diabetes (mellitus or insipidus), such as excessive thirst (polydipsia) and check blood glucose levels.
- For a patient presenting with oliguria, edema, and hypertension, the nurse should anticipate orders for urinalysis and renal function tests to investigate for glomerulonephritis.
How to Approach the Question
- First, identify the core concept: The question asks which condition is NOT associated with polyuria (excessive urination). This is a negative-framing question.
- Define 'polyuria': Recall that it means producing an abnormally large volume of urine (typically more than 3 liters/day).
- Analyze each option's effect on urine output:
- Consider Diabetes Insipidus: This is a classic cause of massive polyuria due to ADH problems.
- Consider Diabetes Mellitus: This causes polyuria through osmotic diuresis from high blood sugar.
- Consider Glomerulonephritis: This involves inflammation of the kidney's filters, which reduces filtration and causes decreased urine output (oliguria).
Concept Tested & Keywords
- Concept Tested: Pathophysiology of renal diseases and their effect on urine output.
- Stem keywords: polyuria, clinical finding
- Lead-in keywords: not be seen in
- Negative lead-in flag: The question asks to identify the condition where polyuria is NOT a feature.
Question ID
QU5wP-uu1OcJrmkcAztR50
Practise the full NORCET -4 , 2023
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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