Nephrology Practice Questions

Q: Which of the following statements regarding Goodpasture's syndrome is NOT true?

It typically causes slowly progressive renal failure.. **Explanation:** Goodpasture’s Syndrome (Anti-GBM Disease) is a classic example of a **Type II Hypersensitivity reaction**. The hallmark of this condition is the presence of circulating autoantibodies directed against the **NC1 domain of the alpha-3 chain of Type IV collagen** [2]. This specific antigen is found in the basement membranes of both the renal glomeruli and the pulmonary alveoli. **Why Option D is the correct answer (False statement):** Goodpasture’s syndrome does not cause slowly progressive renal failure. Instead, it typically presents as **Rapidly Progressive Glomerulonephritis (RPGN)**. Without urgent intervention (plasmapheresis and immunosuppression), it can lead to end-stage renal disease within days to weeks [1]. On biopsy, it is characterized by **crescent formation** (Crescentic GN) and **linear IgG deposits** on immunofluorescence [1], [2]. **Analysis of other options:** * **Option A:** It is a prototypical organ-specific **autoimmune disease** triggered by environmental factors (like smoking or hydrocarbon exposure) in genetically susceptible individuals (HLA-DRB1*1501). * **Option B:** This accurately describes the pathophysiology. The **alpha-3 chain of Type IV collagen** is the specific target [2]. * **Option C:** Pulmonary involvement manifests as **alveolar hemorrhage**, which appears as diffuse bilateral pulmonary infiltrates on a chest X-ray. **High-Yield NEET-PG Pearls:** * **Triad:** Glomerulonephritis, Pulmonary hemorrhage, and Anti-GBM antibodies. * **Immunofluorescence:** Linear (not granular) deposition of IgG along the GBM [2]. * **Treatment:** The "Triple Therapy" includes **Plasmapheresis** (to remove antibodies), Corticosteroids, and Cyclophosphamide [1]. * **Strongest Risk Factor:** Strong association with **HLA-DR15 and DR4**.

Q: Hyaline casts are seen in which of the following conditions?

Normal urine. **Explanation:** **Hyaline casts** are the most common type of urinary cast. They are composed primarily of **Tamm-Horsfall mucoprotein** (uromodulin) secreted by the thick ascending limb of the Loop of Henle. Because they lack cellular inclusions, they appear transparent and colorless under light microscopy. 1. **Why "Normal urine" is correct:** Hyaline casts are not inherently pathological. They can be seen in healthy individuals, particularly following **strenuous exercise, dehydration**, or concentrated urine [1]. While they can increase in various renal diseases, their presence alone does not signify a specific pathology. 2. **Why the other options are incorrect:** * **Acute Tubular Necrosis (ATN):** Characterized by **"Muddy brown" granular casts** or renal tubular epithelial cell casts due to sloughing of necrotic cells. * **Thrombotic Microangiopathy (TMA):** Typically presents with hematuria and proteinuria; however, the hallmark is microangiopathic hemolytic anemia (schistocytes on smear). It does not produce specific diagnostic casts like hyaline casts. * **Pyelonephritis:** Characterized by **WBC (Leukocyte) casts**, which indicate tubulointerstitial inflammation or infection. **High-Yield Clinical Pearls for NEET-PG:** * **RBC Casts:** Pathognomonic for Glomerulonephritis (e.g., Post-streptococcal GN). * **WBC Casts:** Seen in Pyelonephritis and Acute Interstitial Nephritis (AIN). * **Fatty Casts ("Maltese Cross"):** Seen in Nephrotic Syndrome. * **Broad/Waxy Casts:** Indicative of Chronic Renal Failure (due to compensatory dilation of surviving nephrons). * **Granular Casts:** Often described as "weathered" cellular casts; seen in ATN (Muddy brown).

Q: Which of the following changes does NOT occur in malignant hypertension?

Hyaline arteriosclerosis. **Explanation:** Malignant hypertension (hypertensive emergency) is characterized by a sudden, severe rise in blood pressure (typically >200/120 mmHg), leading to acute vascular injury. The hallmark of this condition is **acute** hemodynamic stress, whereas **Hyaline arteriosclerosis** is a feature of **benign hypertension** or diabetes mellitus [1]. **1. Why Hyaline Arteriosclerosis is the Correct Answer:** Hyaline arteriosclerosis occurs due to chronic, long-standing "leakage" of plasma components across the vascular endothelium, resulting in pink, homogeneous thickening of the arteriolar walls [1]. It is a slow, degenerative process associated with chronic hypertension, not the acute, necrotizing injury seen in malignant hypertension. **2. Analysis of Other Options:** * **Fibrinoid necrosis (Option B):** This is the pathognomonic lesion of malignant hypertension. Acute pressure elevation causes necrosis of the vessel wall with accumulation of plasma proteins (fibrin), giving it a bright pink, granular appearance. * **Intimal concentric thickening (Option C):** Also known as **"Onion-skinning,"** this is a proliferative response to acute injury where smooth muscle cells migrate and proliferate in the intima, creating concentric layers. * **Petechial hemorrhages (Option D):** The rupture of necrotic arterioles and capillaries on the kidney's cortical surface leads to a "flea-bitten kidney" appearance, a classic gross finding in malignant hypertension. **NEET-PG High-Yield Pearls:** * **Flea-bitten Kidney:** Seen in Malignant Hypertension, Infective Endocarditis, and PSGN. * **Onion-skinning:** Characteristic of Hyperplastic Arteriolosclerosis (Malignant HTN). * **Hyaline Arteriosclerosis:** Associated with Benign HTN and Diabetic Microangiopathy [1]. * **Key Clinical Feature:** Malignant HTN must be accompanied by end-organ damage (e.g., papilledema, encephalopathy, or acute kidney injury).

Q: What is the initial ECG change observed in Hyperkalemia?

Tall tented T waves. ### Explanation **Correct Option: A (Tall tented T waves)** Hyperkalemia increases the permeability of the cell membrane to potassium, leading to accelerated repolarization (Phase 3 of the action potential). This rapid repolarization manifests on the ECG as **tall, peaked, or "tented" T waves** [1]. This is the **earliest and most sensitive** ECG sign of hyperkalemia, typically occurring when serum potassium levels exceed 5.5–6.0 mEq/L [1]. These T waves are classically narrow-based and symmetrical, primarily seen in the precordial leads (V2–V4). **Analysis of Incorrect Options:** * **B. PR prolongation:** This occurs as potassium levels continue to rise (usually >6.5 mEq/L). High extracellular potassium causes partial depolarization of the resting membrane, leading to decreased excitability and slowed conduction through the AV node. * **C. Widening of the QRS complex:** This is a later sign (usually >7.0 mEq/L) indicating delayed intraventricular conduction [1]. If left untreated, the QRS eventually merges with the T wave to form a "sine wave" pattern, a precursor to ventricular fibrillation or asystole. * **D. ST segment depression:** While hyperkalemia can sometimes cause ST-segment changes (pseudoinfarction patterns), it is not the initial or characteristic change. ST depression is more commonly associated with hypokalemia or myocardial ischemia. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Changes:** Tall T waves → PR prolongation/P wave flattening → QRS widening → Sine wave → Cardiac arrest [1]. * **Membrane Stabilization:** In patients with ECG changes, the immediate first step is **Intravenous Calcium Gluconate** (stabilizes the cardiac membrane) before shifting potassium into cells [2]. * **The "Rule of 5":** Potassium > 5.5 mEq/L is hyperkalemia; ECG changes often begin here. * **Pseudohyperkalemia:** Always rule out hemolysis during blood collection if ECG is normal despite high lab values.

Q: Anion gap is increased in all except:

Ureterostomy. ### Explanation Metabolic acidosis is categorized based on the **Anion Gap (AG)**, calculated as: $Na^+ - (Cl^- + HCO_3^-)$. The normal range is 8–12 mEq/L [1]. **1. Why Ureterostomy is the correct answer:** Ureterostomy (specifically ureterosigmoidostomy) causes a **Normal Anion Gap Metabolic Acidosis (NAGMA)**, also known as hyperchloremic metabolic acidosis [1]. When ureters are diverted into the bowel, the intestinal mucosa secretes bicarbonate ($HCO_3^-$) in exchange for chloride ($Cl^-$) from the urine. The loss of bicarbonate is balanced by a gain in chloride, keeping the anion gap within the normal range. **2. Why the other options are incorrect:** These conditions cause **High Anion Gap Metabolic Acidosis (HAGMA)** due to the accumulation of unmeasured organic acids: * **Ethylene glycol:** Metabolized into glycolic and oxalic acids. * **Methanol (Methylene glycol/Methanol):** Metabolized into formic acid [2]. (Note: "Methylene glycol" in the option likely refers to Methanol or a related toxic alcohol in the context of HAGMA). * **Diabetic Ketoacidosis (DKA):** Characterized by the production of acetoacetate and beta-hydroxybutyrate [3]. **Clinical Pearls for NEET-PG:** * **Mnemonic for HAGMA (MUDPILES):** **M**ethanol, **U**remia, **D**KA, **P**araldehyde, **I**ron/Isoniazid, **L**actic acidosis, **E**thylene glycol, **S**alicylates. * **Mnemonic for NAGMA (USED CARP):** **U**reterosigmoidostomy, **S**aline (Normal Saline infusion), **E**ndocrine (Addison’s), **D**iarrhea, **C**arbonic anhydrase inhibitors (Acetazolamide), **R**enal tubular acidosis (RTA), **P**ancreatic fistula. * **Gold Standard:** In toxic alcohol ingestion (Ethylene glycol/Methanol), both the **Anion Gap** and the **Osmolar Gap** are typically elevated.

Question 1

Which of the following statements regarding Goodpasture's syndrome is NOT true?

Accepted Answer

It typically causes slowly progressive renal failure.

Answer

It is an autoimmune disease.

Answer

Antibodies are directed against the collagen type IV alpha3 chain of the glomerular basement membrane and pulmonary capillaries.

Answer

Patients may present with diffuse bilateral pulmonary infiltrates.

Question 2

Hyaline casts are seen in which of the following conditions?

Accepted Answer

Normal urine

Answer

Acute tubular necrosis

Answer

Thrombotic microangiopathy

Answer

Pyelonephritis

Question 3

Which of the following changes does NOT occur in malignant hypertension?

Accepted Answer

Hyaline arteriosclerosis

Answer

Petechial hemorrhages on cortical surface

Answer

Fibrinoid necrosis of arterioles

Answer

Intimal concentric thickening

Question 4

Which drug is not used to prevent contrast nephropathy?

Accepted Answer

Fenoldopam

Answer

N-acetylcysteine

Answer

Infusion of normal saline

Answer

Hemodialysis

Question 5

Renal papillary necrosis is caused by?

Accepted Answer

Alcohol

Answer

Cocaine

Answer

Heroin

Answer

Morphine

Question 6

What is the initial ECG change observed in Hyperkalemia?

Accepted Answer

Tall tented T waves

Answer

PR prolongation

Answer

Widening of the QRS complex

Answer

ST segment depression

Question 7

A patient has been passing stones recurrently in urine for the past few years. All of the following dietary restrictions are indicated EXCEPT:

Accepted Answer

Calcium restriction

Answer

Protein restriction

Answer

Salt restricted diet

Answer

Phosphate restriction

Question 8

A 10-mm calculus in the right lower ureter associated with proximal hydroureteronephrosis is best treated with?

Accepted Answer

Ureteroscopic retrieval

Answer

Extracorporeal shockwave lithotripsy

Answer

Antegrade percutaneous access

Answer

Open ureterolithotomy

Question 9

A patient presents with urine that is red in color, has a positive dipstick for RBCs, and the supernatant is red while the sediment is clear. What is the most likely diagnosis?

Accepted Answer

Rhabdomyolysis

Answer

Porphyria

Answer

Hematuria

Answer

Hemolysis

Question 10

Anion gap is increased in all except:

Accepted Answer

Ureterostomy

Answer

Ethylene glycol

Answer

Methylene glycol

Answer

Diabetic ketoacidosis

Nephrology — MCQs

Nephrology — MCQs

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