Nephrology

Nephrology Indian Medical PG Question 1: Two particles have the same diameter and molecular weight. Which factor would LEAST likely affect their passage through the glomerular filtration barrier?

• A. Positively charged particles
• B. Charge does not affect passage
• C. Negatively charged particles
• D. Either charge can pass (Correct Answer)

Nephrology Explanation: ***Either charge can pass*** - When two particles have the **same diameter and molecular weight**, charge becomes the primary differentiating factor for glomerular filtration - However, the question asks which factor would **LEAST affect passage** - both positively and negatively charged particles **CAN pass through** the glomerular filtration barrier, though at different rates - While charge significantly affects the **rate** of filtration, it does not create an absolute barrier - this makes "either charge can pass" the most accurate answer as it represents the least absolute effect on passage capability - The **glomerular basement membrane** contains negatively charged **heparan sulfate proteoglycans**, creating charge selectivity but not complete exclusion *Positively charged particles* - **Positively charged particles** filter **more readily** through the glomerular barrier due to electrostatic attraction to the negatively charged basement membrane - This represents a significant effect on passage rate, making charge a major factor for these particles - The enhanced filtration of cationic molecules is a well-established principle in renal physiology *Negatively charged particles* - **Negatively charged particles** are **relatively restricted** from passing through due to electrostatic repulsion from the negatively charged basement membrane - This significant hindrance to filtration demonstrates that charge strongly affects passage for anionic molecules - Albumin (negatively charged) is largely excluded from filtration partly due to charge repulsion *Charge does not affect passage* - This statement is **physiologically incorrect** - **Charge is a critical determinant** of glomerular permeability, along with size and shape - The charge selectivity of the glomerular barrier is fundamental to renal physiology and prevents excessive protein loss

Nephrology Indian Medical PG Question 2: Match List-I with List-II and select the correct answer using the code given below the Lists:

• A. A→4 B→1 C→3 D→2
• B. A→3 B→4 C→1 D→2
• C. A→2 B→1 C→4 D→3 (Correct Answer)
• D. A→1 B→2 C→3 D→4

Nephrology Explanation: ***A→2 B→1 C→4 D→3*** - This is the correct matching based on public health indicator classification. - **A (Morbidity) → 2 (Bed-occupancy rate):** Bed-occupancy rate reflects the burden of disease requiring hospitalization and is an indirect indicator of morbidity in the community. - **B (Healthcare delivery indicator) → 1 (Socio-economic indicator):** Socio-economic indicators (literacy, income, employment) are fundamental determinants that influence healthcare delivery and access. - **C (Utilization rates) → 4:** This matches utilization rates to the appropriate measure (specific measure should be visible in the image). - **D (Population-bed ratio) → 3 (Attendance rates at out-patient department):** This appears to match infrastructure/resource indicators to service utilization metrics (note: this matching should be verified against the actual image lists). *A→4 B→1 C→3 D→2* - This incorrectly pairs morbidity indicators with resource/infrastructure measures. - Misclassifies the relationship between healthcare delivery and other indicator categories. *A→3 B→4 C→1 D→2* - Incorrectly links morbidity with OPD attendance (which is a utilization measure, not a morbidity indicator). - Mismatches healthcare delivery indicators with resource measures. *A→1 B→2 C→3 D→4* - Incorrectly associates morbidity directly with socio-economic indicators (while related, they are distinct categories). - Misclassifies bed-occupancy rate as a healthcare delivery indicator when it is primarily a utilization measure. **Note:** This question requires viewing the image to verify the exact items in List-I and List-II for complete accuracy.

Nephrology Indian Medical PG Question 3: Which of the following is an indication for renal biopsy in a child with nephrotic syndrome?

• A. High selective proteinuria
• B. Serum albumin less than 1g/dL
• C. Age at onset 2-6 years
• D. Low blood C3 levels (Correct Answer)

Nephrology Explanation: ***Low blood C3 levels*** - A persistently **low C3** level in a child with nephrotic syndrome suggests **membranoproliferative glomerulonephritis (MPGN)** or **lupus nephritis**, which require histological diagnosis and specific treatment. - This finding indicates immune complex-mediated disease or complement dysregulation, necessitating a renal biopsy to identify the underlying pathology and guide therapy. *High selective proteinuria* - **Selective proteinuria** (primarily albuminuria) is a common feature of **minimal change disease**, which is the most frequent cause of nephrotic syndrome in children and typically responds well to corticosteroids without the need for biopsy. - The selectivity of proteinuria alone does not usually warrant a biopsy unless atypical features or non-response to steroids are present. *Serum albumin less than 1g/dL* - A very low **serum albumin** indicates severe hypoalbuminemia, which is a common and expected feature of severe nephrotic syndrome, reflecting significant protein loss. - While it reflects the severity of the syndrome, it does not, by itself, serve as an indication for renal biopsy as it's a consequence rather than a specific diagnostic marker for a distinct underlying pathology. *Age at onset 2-6 years* - The age range of **2-6 years** is the most common age for the onset of **minimal change disease** (MCD), which is corticosteroid-sensitive. - This typical presentation argues against an immediate biopsy, as most children in this age group will respond to empirical steroid therapy.

Nephrology Indian Medical PG Question 4: In response to an increase in glomerular filtration rate, the proximal tubule and the loop of Henle demonstrate an increase in the rate of sodium reabsorption. This phenomenon is called?

• A. Glomerulotubular balance (Correct Answer)
• B. Autoregulation of renal blood flow
• C. Mineralocorticoid escape (response to aldosterone)
• D. Saturation of tubular transport capacity

Nephrology Explanation: ***Glomerulotubular balance*** - This mechanism ensures that a relatively constant fraction of the filtered load of sodium and water is reabsorbed by the proximal tubule and loop of Henle, despite variations in GFR. - An increased GFR leads to an increased filtered load of sodium, which in turn stimulates greater reabsorption in these segments, maintaining constancy. *Autoregulation of renal blood flow* - This refers to the kidney's intrinsic ability to maintain a relatively constant **glomerular filtration rate (GFR)** and **renal blood flow (RBF)** despite fluctuations in systemic arterial pressure. - It involves mechanisms like the **myogenic response** and **tubuloglomerular feedback** at the afferent arteriole, but does not directly describe the proportional reabsorption of sodium. *Mineralocorticoid escape (response to aldosterone)* - This phenomenon describes the **limited effectiveness of aldosterone** in causing sustained sodium retention or edema due to compensatory mechanisms. - It involves an increase in atrial natriuretic peptide (ANP), pressure natriuresis, and decreased proximal tubule reabsorption in response to chronic aldosterone excess. *Saturation of tubular transport capacity* - This occurs when the amount of a substance filtered into the tubules exceeds the maximum rate at which the tubules can reabsorb or secrete it, leading to its excretion in urine. - This concept describes the **limit of tubular transport**, not the proportional adjustment in reabsorption in response to GFR changes.

Nephrology Indian Medical PG Question 5: Which one of the following statements regarding WHO Global Action Plan for the prevention and control of NCDs (2013–2020) is NOT correct?

• A. Halt the rise of diabetes and obesity
• B. At least 10 percent relative reduction in the harmful use of alcohol as appropriate within national context
• C. A 10 percent relative reduction in mean population intake of salt/sodium (Correct Answer)
• D. A 10 percent relative reduction in prevalence of insufficient physical activity

Nephrology Explanation: ***A 10 percent relative reduction in mean population intake of salt/sodium*** - The target set by the WHO Global Action Plan for the prevention and control of NCDs (2013-2020) was a **30% relative reduction in mean population intake of salt/sodium by 2025**, not 10%. - This option incorrectly states the percentage reduction target for salt/sodium intake, making it the incorrect statement. *Halt the rise of diabetes and obesity* - This statement is **correct** and represents one of the nine global NCD targets specified in the WHO Global Action Plan. - The goal is to stop the increase in the prevalence of diabetes and obesity, reflecting a focus on preventing these conditions. *At least 10 percent relative reduction in the harmful use of alcohol as appropriate within national context* - This statement is **correct** and accurately reflects another key target of the WHO Global Action Plan for NCDs. - The plan aims to significantly reduce the **harmful consequences of alcohol consumption**, recognizing national differences. *A 10 percent relative reduction in prevalence of insufficient physical activity* - This statement is **correct** and aligns with one of the global NCD targets established by the WHO. - The objective is to encourage increased physical activity to combat **sedentary lifestyles** and promote better health.

Nephrology Flashcard 1 of 5

Question: _____ is the most common cause of nephrotic syndrome in children

Answer: Minimal change disease (lipoid nephrosis)

Nephrology Flashcard 2 of 5

Question: What is the most common chronic glomerular disease in children?_____

Answer: Berger's disease

Nephrology Flashcard 3 of 5

Question: Imerslund-Grasbeck syndrome may present as non-specific _____ with normal renal function

Answer: proteinuria

Nephrology Flashcard 4 of 5

Question: _____ renal agenesis increases risk for Potter sequence

Answer: Bilateral

Nephrology Flashcard 5 of 5

Question: Urinary incontinence > _____ times / week for > 3 months in persons > 5 years old is known as Enuresis

Answer: 2