Nephrology Practice Questions

Q: In Bartter syndrome defect is seen in:

Defect in thick ascending limb of loop of Henle. ***Defect in thick ascending limb of loop of Henle*** - Bartter syndrome results from a **genetic defect** affecting the activity of the **Na-K-2Cl cotransporter (NKCC2)** in the thick ascending limb of the loop of Henle. - This defect impairs **sodium, potassium, and chloride reabsorption**, leading to their increased excretion and characteristic electrolyte imbalances. *Defect in proximal convoluted tubule (PCT)* - Defects in the **proximal convoluted tubule** are typically associated with conditions like **Fanconi syndrome**, affecting reabsorption of glucose, amino acids, phosphate, and bicarbonate [1]. - This does not align with the characteristic **electrolyte imbalances** seen in Bartter syndrome, particularly hypokalemia and metabolic alkalosis. *Defect in distal convoluted tubule (DCT)* - Defects in the **distal convoluted tubule** are seen in conditions like **Gitelman syndrome**, which affects the Na-Cl cotransporter. - While both Bartter and Gitelman syndromes present with hypokalemia and metabolic alkalosis, the specific transporter affected and the severity of certain electrolyte disturbances differ. *No defect* - Bartter syndrome is a well-defined **genetic disorder** characterized by specific renal tubular defects. - Stating there is no defect is incorrect, as the syndrome arises directly from impaired renal tubule function.

Q: Which of the following types of kidney stones are commonly associated with urinary tract infections?

Struvite stones. ***Struvite stones*** - **Struvite stones** (magnesium ammonium phosphate) are strongly associated with **urinary tract infections (UTIs)** caused by urease-producing bacteria like *Proteus* and *Klebsiella*. - These bacteria hydrolyze urea into ammonia and carbon dioxide, increasing urine pH and promoting the precipitation of struvite, often forming **staghorn calculi** [1]. *Cystine stones* - **Cystine stones** are caused by a **genetic defect** in amino acid transport, leading to increased excretion of cystine, ornithine, lysine, and arginine (COLA) in the urine. - They are not directly associated with UTIs but rather with a rare inherited metabolic disorder called **cystinuria**. *Xanthine stones* - **Xanthine stones** are very rare and typically occur in individuals with **xanthinuria**, a genetic disorder characterized by a deficiency in xanthine oxidase. - They are also not linked to UTIs but are a consequence of abnormal purine metabolism. *Calcium oxalate stones* - **Calcium oxalate stones** are the most common type of kidney stone, resulting from high levels of calcium and oxalate in the urine, often due to dietary factors, malabsorption, or idiopathic hypercalciuria. - While UTIs can complicate any kidney stone, **calcium oxalate stones** are not primarily *caused* by UTIs. [1]

Q: Most common acute complication of dialysis is

Hypotension. ***Hypotension*** - **Intradialytic hypotension** is the most common acute complication, occurring in 15-30% of dialysis sessions. - It is often caused by rapid removal of fluid (ultrafiltration), leading to a significant drop in blood pressure [1]. *Bleeding* - While bleeding can occur due to **anticoagulation** used during dialysis or as a complication of vascular access, it is less common than hypotension. - It is not considered the most frequent acute complication of the dialysis procedure itself. *Dementia* - **Dementia** is a chronic neurological condition that is not an acute complication directly attributable to a single dialysis session. - It can be a long-term comorbidity in patients with end-stage renal disease (ESRD), but not an immediate side effect. *Muscle cramps* - **Muscle cramps** are a relatively common acute complication during or immediately after dialysis, affecting about 5-20% of patients. - However, their frequency is generally lower than that of intradialytic hypotension [1].

Q: Crush Syndrome is associated with all of the following features except -

Hypercalcemia. ***Hypercalcemia*** - Crush syndrome involves massive **muscle damage** leading to the release of intracellular contents, but hypercalcemia is not typically seen acutely. - While skeletal muscle contains calcium, its release, if any, is usually outweighed by other electrolyte shifts and renal dysfunction, often leading to **hypocalcemia** due to calcium binding to damaged tissues and phosphate. *Hypocalcemia* - This is a common feature of **crush syndrome** because calcium ions move into damaged cells and bind to free fatty acids and damaged tissue. - The elevated **phosphate levels** released from damaged cells can also bind to circulating calcium, further reducing serum calcium. *Hyperkalemia* - One of the most dangerous complications of **crush syndrome**, resulting from the massive release of **intracellular potassium** from damaged muscle cells. - Can lead to **life-threatening arrhythmias** if not promptly managed. *Increased serum creatinine* - Damaged muscle releases large amounts of **creatinine**, which is a byproduct of muscle metabolism; this, along with **myoglobin** (leading to acute kidney injury), causes a significant increase in serum creatinine levels. - **Acute kidney injury** due to rhabdomyolysis is a hallmark of crush syndrome, leading to impaired clearance of waste products.

Q: Muehrcke lines in nails are seen in

Nephrotic syndrome. ***Nephrotic syndrome*** - **Muehrcke lines** are paired, white, transverse lines that do not move with nail growth, characteristic of **hypoalbuminemia** seen in nephrotic syndrome [1]. - These lines are caused by **edema** in the nail bed, making them visible through the nail plate. *Bartter syndrome* - Characterized by a defect in the **sodium-potassium-chloride cotransporter** in the loop of Henle, leading to electrolyte imbalances. - It does not typically present with nail changes like Muehrcke lines. *Nail-patella syndrome* - A genetic disorder causing **skeletal abnormalities**, including hypoplastic or absent patellae and nail dysplasia. - Nail changes are usually structural abnormalities (e.g., triangular lunulae, ridging), not Muehrcke lines. *Acute tubular necrosis* - Involves damage to the **renal tubules**, often causing acute kidney injury and electrolyte disturbances. - While it can lead to kidney dysfunction, it is not specifically associated with Muehrcke lines.

Q: Which of the following is the MOST common condition caused by hypernatremia?

Seizure. ***Seizure*** - While not the *most* common initial symptom, **seizure** can be a severe manifestation of hypernatremia, particularly when the serum sodium levels rise rapidly or to very high concentrations leading to significant neuronal dehydration. - **Rapid correction of severe hypernatremia** can also induce seizures if the brain cells swell too quickly. *Altered mental status* - **Altered mental status** such as lethargy, confusion, or irritability, is a very common and often an earlier symptom of hypernatremia due to neuronal dehydration and intracellular water shifts, but it generally precedes more severe neurological complications like seizures.[1] - It is a broad term that encompasses a range of neurological dysfunctions, and while frequent, it is not as specific a severe endpoint as a seizure. *Brain hemorrhage* - **Brain hemorrhage** is a rare and severe complication of hypernatremia, primarily seen when extreme osmotic shifts cause significant brain shrinkage, leading to tension on bridging veins and potential rupture. - This is not a common presentation and typically occurs only in very severe cases of hypernatremia or during overly rapid correction. *Central pontine myelinosis* - **Central pontine myelinolysis (CPM)** is a neurological disorder caused by too rapid correction of *chronic hyponatremia*, not hypernatremia.[1] - It results from osmotic damage to myelin sheaths in the pons, leading to severe neurological deficits such as dysphagia, dysarthria, and even locked-in syndrome.[1]

Q: Which of the following is NOT a common cause of acute renal failure?

Chronic kidney disease due to analgesic nephropathy. Chronic kidney disease due to analgesic nephropathy - This is a cause of chronic kidney disease, characterized by gradual, irreversible kidney damage over a long period due to prolonged use of certain analgesics. [1] - It does not present as an acute, sudden decline in kidney function, which is the hallmark of acute renal failure. [1] Acute pyelonephritis - Severe cases of acute pyelonephritis (kidney infection) can lead to acute kidney injury due to sepsis, inflammation, and potential obstruction. [1] - The systemic inflammatory response and direct tissue damage can impair kidney function rapidly. [1] Acute kidney injury from snakebite - Snake envenomation can cause acute kidney injury through various mechanisms, including hemolysis, rhabdomyolysis, direct nephrotoxicity, and systemic hypotension. - These effects can lead to rapid and severe kidney damage. Acute kidney injury due to rhabdomyolysis - Rhabdomyolysis involves the breakdown of skeletal muscle tissue, releasing large amounts of myoglobin into the bloodstream. [1] - Myoglobin is toxic to the renal tubules, leading to acute tubular necrosis and rapid onset of acute kidney injury. [1]

Q: Polyuria with low fixed specific gravity urine is seen in ?

Chronic glomerulonephritis. ***Chronic glomerulonephritis*** - Damage to the **renal tubules** in chronic glomerulonephritis impairs their ability to concentrate urine, leading to polyuria with a **low, fixed specific gravity**. [1] - This fixed specific gravity reflects the kidneys' inability to adjust urine concentration in response to hydration status, a hallmark of **chronic kidney disease**. [2] *Diabetes mellitus* - Polyuria in diabetes mellitus is caused by **osmotic diuresis** due to high glucose levels in the urine, leading to increased urinary volume. [2] - While there is polyuria, the specific gravity is not necessarily fixed and can vary, often being high due to the presence of glucose. *Diabetes insipidus* - Diabetes insipidus causes polyuria and dilute urine due to either a deficiency of **ADH (central DI)** or renal unresponsiveness to ADH **(nephrogenic DI)**. - While it causes polyuria with low specific gravity, it's typically *not* fixed; the urine specific gravity can still fluctuate to some extent depending on the patient's hydration, or in response to ADH if it's central DI. *Potomania* - Potomania, or **primary polydipsia**, is excessive water intake that leads to dilutional hyponatremia and polyuria. - The kidneys are otherwise healthy and can still concentrate urine to some extent if water intake is restricted, preventing a truly fixed low specific gravity.

Q: What condition is characterized by hypertension and hypokalemia?

Liddle's Syndrome. ***Liddle's Syndrome*** - This syndrome is characterized by **overactivity of the epithelial sodium channel (ENaC)** in the collecting ducts, leading to increased sodium reabsorption and potassium excretion. [1] - The resulting **sodium retention causes hypertension**, while the **potassium excretion leads to hypokalemia**. *Gitelman's Syndrome* - This is an **autosomal recessive kidney disorder** causing a defect in the **thiazide-sensitive NaCl cotransporter** in the distal convoluted tubule. - It presents with **hypokalemia and hypomagnesemia**, but typically with **normal or low blood pressure**, not hypertension. *Bartter Syndrome* - This is a group of **autosomal recessive salt-wasting tubulopathies** affecting the **Na-K-2Cl cotransporter** in the thick ascending limb of the loop of Henle. - It leads to **hypokalemia, metabolic alkalosis, and normal or low blood pressure**, similar to chronic loop diuretic use. *All of the options* - While all mentioned conditions involve **hypokalemia**, only **Liddle's Syndrome** is consistently associated with **hypertension**. - **Gitelman's and Bartter syndromes** typically present with **normal or low blood pressure**.

Q: Which of the following symptoms is least likely to be associated with hyponatremia?

Myalgia. Myalgia - While muscle cramps can occur with electrolyte imbalances, generalized myalgia (muscle pain) is not a typical or primary symptom of hyponatremia. - Hyponatremia primarily affects neurological function due to osmotic shifts in the brain. anorexia - Anorexia (loss of appetite) is a common, non-specific symptom of many metabolic disturbances, including hyponatremia, and often accompanies nausea and vomiting. - It arises from the general malaise and gastrointestinal upset associated with the condition. Convulsions - Convulsions are a severe neurological symptom of acute and profound hyponatremia, resulting from cerebral edema and increased intracranial pressure [1]. - This occurs when the brain swells due to the osmotic shift of water into brain cells. Drowsiness - Drowsiness is a frequent neurological manifestation of hyponatremia, indicative of altered mental status [1]. - It reflects impaired brain function due to the osmotic disturbances and potential cerebral edema [1].

Question 1

In Bartter syndrome defect is seen in:

Accepted Answer

Defect in thick ascending limb of loop of Henle

Answer

Defect in proximal convoluted tubule (PCT)

Answer

Defect in distal convoluted tubule (DCT)

Answer

No defect

Question 2

Which of the following types of kidney stones are commonly associated with urinary tract infections?

Accepted Answer

Struvite stones

Answer

Cystine stones

Answer

Xanthine stones

Answer

Calcium oxalate stones

Question 3

Most common acute complication of dialysis is

Accepted Answer

Hypotension

Answer

Bleeding

Answer

Dementia

Answer

Muscle cramps

Question 4

Crush Syndrome is associated with all of the following features except -

Accepted Answer

Hypercalcemia

Answer

Hypocalcemia

Answer

Hyperkalemia

Answer

Increased serum creatinine

Question 5

Muehrcke lines in nails are seen in

Accepted Answer

Nephrotic syndrome

Answer

Bartter syndrome

Answer

Nail-patella syndrome

Answer

Acute tubular necrosis

Question 6

Which of the following is the MOST common condition caused by hypernatremia?

Accepted Answer

Seizure

Answer

Altered mental status

Answer

Brain hemorrhage

Answer

Central pontine myelinosis

Question 7

Which of the following is NOT a common cause of acute renal failure?

Accepted Answer

Chronic kidney disease due to analgesic nephropathy

Answer

Acute pyelonephritis

Answer

Acute kidney injury from snakebite

Answer

Acute kidney injury due to rhabdomyolysis

Question 8

Polyuria with low fixed specific gravity urine is seen in ?

Accepted Answer

Chronic glomerulonephritis

Answer

Diabetes mellitus

Answer

Diabetes insipidus

Answer

Potomania

Question 9

What condition is characterized by hypertension and hypokalemia?

Accepted Answer

Liddle's Syndrome

Answer

Gitelman's Syndrome

Answer

Bartter Syndrome

Answer

All of the options

Question 10

Which of the following symptoms is least likely to be associated with hyponatremia?

Accepted Answer

Myalgia

Answer

anorexia

Answer

Drowsiness

Answer

Convulsions

Nephrology — MCQs

Nephrology — MCQs

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