Nephrology Practice Questions

Q: Distal renal tubular acidosis is associated with:

Calcium stones. ***Calcium stones*** - Distal renal tubular acidosis (Type 1 RTA) causes metabolic acidosis due to impaired distal tubular **hydrogen ion secretion**. - This leads to **increased urinary calcium excretion** (hypercalciuria) and decreased urinary citrate, creating an environment favorable for the formation of **calcium phosphate renal stones**. *Oxalate stones* - While oxalate is a component of some calcium stones (calcium oxalate), **primary hyperoxaluria** or dietary excess of oxalate are the main causes, not directly distal RTA. - Distal RTA specifically promotes **calcium phosphate stone formation** due to pH changes and hypercalciuria. *Hypocitraturia* - **Hypocitraturia** is indeed a feature of distal RTA as the kidney attempts to excrete acid by reabsorbing citrate, making the urine less inhibitory to stone formation. - However, the most direct and common clinically observed consequence in stone formation is the development of **calcium stones**, as hypocitraturia combined with hypercalciuria facilitates their formation. *Uric acid stones* - **Uric acid stones** typically form in persistently **acidic urine** and are associated with conditions like gout or myeloproliferative disorders. - While distal RTA results in systemic acidosis, the urine pH in distal RTA is typically **alkaline or inappropriately neutral**, which does not favor uric acid stone formation.

Q: What is the best treatment for anemia in patients with Chronic Renal Failure (CRF)?

Erythropoietin Stimulating Agents. ***Erythropoietin Stimulating Agents*** - **Erythropoietin Stimulating Agents (ESAs)** are the cornerstone of anemia treatment in CRF because the primary cause of anemia in these patients is inadequate production of **endogenous erythropoietin** by the damaged kidneys [1]. - ESAs stimulate the bone marrow to produce red blood cells, effectively reversing the anemia and improving symptoms like fatigue and exercise intolerance [1]. *Oral Iron Therapy* - While **iron deficiency** often coexists with **anemia of chronic disease** in CRF patients, oral iron alone is usually insufficient to correct the anemia; it only addresses the iron component. - Many CRF patients have **functional iron deficiency** due to chronic inflammation, which impairs iron utilization, making oral iron less effective even with adequate stores. *Blood transfusion* - **Blood transfusions** provide a rapid increase in hemoglobin but are not the preferred long-term treatment for anemia in CRF due to risks of **iron overload**, **alloreactions**, and potential sensitization, which can complicate future transplantation. - Transfusions are typically reserved for acute, severe anemia or specific circumstances where ESAs are ineffective or contraindicated. *Androgenic Steroids* - **Androgenic steroids** can stimulate erythropoiesis, but their use is limited due to significant side effects such as **hepatotoxicity**, **virilization**, and **cardiac complications**, making them a less favorable option compared to ESAs. - They are considered a secondary or tertiary option, often in patients unresponsive to primary treatments or when other options are exhausted.

Q: Which of the following electrolyte imbalances is least likely to be observed in Chronic Renal Failure (CRF)?

Hypercalcemia. ***Hypercalcemia*** - In **chronic renal failure (CRF)**, the kidneys' inability to activate vitamin D leads to impaired calcium absorption and **hypocalcemia** [1], [2]. - Additionally, the kidneys fail to excrete phosphate, leading to **hyperphosphatemia**, which further exacerbates hypocalcemia by forming calcium-phosphate precipitates [1]. *Hyperkalemia* - **Hyperkalemia** is a common and serious complication of CRF due to the kidneys' impaired ability to excrete **potassium**. - This is exacerbated by conditions like **metabolic acidosis** and certain medications. *Hyperphosphatemia* - In CRF, the kidneys are unable to adequately excrete **phosphate**, leading to an accumulation of **phosphate** in the blood [1]. - This condition directly contributes to **secondary hyperparathyroidism** and bone disease [1], [2]. *Hypocalcemia* - **Hypocalcemia** is very common in CRF, primarily due to decreased production of **calcitriol (active vitamin D)** by the failing kidneys [2]. - Reduced calcitriol leads to lower intestinal **calcium absorption** and impaired bone mineralization [1].

Q: Which of the following is a renal-specific nephropathy associated with HIV?

Focal Segmental Glomerulosclerosis (FSGS). ### Focal Segmental Glomerulosclerosis - It is a common renal complication associated with **HIV infection**, characterized by **podocyte injury** and segmental sclerosis [1]. - Often results in **nephrotic syndrome**, presenting with significant **proteinuria** and edema, making it distinct in HIV renal pathology [1]. ### Membranous Glomerulonephritis - Typically presents with **subepithelial immune complex deposits**, leading to a different pathophysiological mechanism. - More commonly associated with other secondary causes, such as **drugs** or **infection**, rather than being specific to HIV. ### Mesangioproliferative Glomerulonephritis - Characterized by **mesangial cell proliferation and immune complex deposition**, often linked with various infections but not specifically with HIV. - Usually shows **hematuria** and mild proteinuria, lacking the severe nephrotic syndrome seen in focal segmental glomerulosclerosis. ### Membranoproliferative Glomerulonephritis - Features **proliferation of mesangial and endothelial cells**, leading to a distinctive pattern on renal biopsy, not specific to HIV. - Typically presents in other contexts such as **chronic infections** or **autoimmune diseases**, rather than predominantly with HIV.

Q: Renal vein thrombosis is associated with all of the following conditions except:

Trauma. **Trauma** - While trauma to the abdomen can cause **renal injury** and other vascular issues, isolated **renal vein thrombosis** is not a common direct association or complication [1]. - Renal vein thrombosis typically results from conditions that lead to a **hypercoagulable state** or local vascular stasis. *Sickle cell anemia* - Individuals with **sickle cell anemia** are prone to **vaso-occlusive crises** from sickled red blood cells obstructing blood flow [2]. - This can lead to **renal medullary ischemia** and infarction, making them highly susceptible to **renal vein thrombosis**. *Nephrotic syndrome* - **Nephrotic syndrome** is a significant risk factor for **renal vein thrombosis** due to the urinary loss of **antithrombin III**, a natural anticoagulant. - This loss creates a **hypercoagulable state**, increasing the likelihood of thrombus formation in renal veins. *Dehydration* - Severe **dehydration** leads to **hemoconcentration** (increased blood viscosity) and reduced blood flow. - These factors promote a **hypercoagulable state**, increasing the risk of thrombotic events, including **renal vein thrombosis**, especially in vulnerable populations like infants or the elderly.

Q: Most common cause of nephrotic syndrome in adults?

Focal Segmental Glomerulosclerosis (FSGS). ***Membranous glomerulonephritis*** - Membranous glomerulonephritis is the **most common cause of nephrotic syndrome** in adults, often associated with **autoimmune diseases** or certain medications. [1] - Patients typically present with **heavy proteinuria**, edema, and a normal renal function in early stages. *Focal GN* - Focal glomerulosclerosis typically affects young individuals and may not usually present as nephrotic syndrome. - It is associated with **obesity** and **HIV**, often leading to more significant renal impairment compared to membranous glomerulonephritis. [1] *Acute GN* - Acute glomerulonephritis generally presents with **hematuria**, **hypertension**, and **renal failure**, rather than nephrotic syndrome. [1] - It can have different causes, such as infections or systemic diseases, but is not the primary condition leading to nephrotic syndrome in adults. *Minimal change disease* - Minimal change disease is more prevalent in **children** [1], and while it can occur in adults, it is less common as a cause of nephrotic syndrome in this demographic. - It is characterized by **responsive edema** to steroids, but its incidence is not as high as membranous glomerulonephritis in adults.

Q: What is the frequency of renal involvement in Henoch-Schönlein purpura (HSP)?

40-60%. ***40-60%*** - Renal involvement in Henoch-Schönlein purpura (HSP) is common, affecting approximately **40-60% of patients**. - Renal complications can range from microscopic hematuria to proteinuria, and in some cases, **progressive glomerulonephritis** leading to renal failure. *25-35%* - This percentage underestimates the actual frequency of **renal complications** in HSP. - While mild symptoms might fall within this range, a broader spectrum of renal manifestations is observed. *60-80%* - This percentage overestimates the reported frequency of **renal involvement** in HSP. - Although it is common, a majority of patients do not develop renal symptoms. *5-10%* - This range is too low for the frequency of **renal involvement** in HSP. - Even though it's benign in many cases, some form of renal pathology like hematuria is quite frequent.

Q: Which of the following is NOT a feature of hypernatremia?

Muscle weakness due to hypokalemia. Muscle weakness due to hypokalemia - **Hypernatremia** does not directly cause **hypokalemia**; these are distinct electrolyte imbalances. Muscle weakness in hypernatremia is more likely due to direct effects on cell excitability rather than low potassium. - While muscle weakness can occur in severe hypernatremia, it is not typically attributed to **hypokalemia**, making this statement inaccurate as a direct feature of hypernatremia. *Convulsions* - Severe **hypernatremia** leads to cellular dehydration, especially in brain cells, which can cause significant neurological symptoms including **convulsions**. - The rapid fluid shifts across the blood-brain barrier due to high extracellular osmolality can disrupt neuronal function, leading to seizures. *Elevated intracranial tension* - **Hypernatremia** causes water to shift out of brain cells into the hyperosmolar extracellular fluid, leading to **brain shrinkage** rather than elevated intracranial tension [1]. - This cellular dehydration reduces brain volume, which would typically lower, not elevate, intracranial tension [1]. *Altered mental status* - **Hypernatremia** causes significant neurological dysfunction due to cellular dehydration in the brain. - This can manifest as various degrees of **altered mental status**, from lethargy and confusion to coma.

Q: In diabetic nephropathy, all of the following are true, except:

Insulin requirement becomes high. ***Insulin requirement becomes high*** - In advanced diabetic nephropathy, especially when renal function significantly declines, the **kidneys' ability to metabolize and excrete insulin decreases**. - This leads to a **prolonged half-life of insulin in the body**, often resulting in a *reduction* in required insulin doses as the disease progresses, rather than an increase. *Cardiovascular abnormalities can occur* - **Diabetic nephropathy** is a major risk factor for developing **cardiovascular disease**, including **hypertension**, atherosclerosis, and heart failure [3]. - The coexistence of these conditions accelerates disease progression and increases morbidity and mortality in diabetic patients [2]. *Micro and macro albuminuria can occur* - **Diabetic nephropathy** characteristically begins with **microalbuminuria** (small amounts of albumin in the urine), which is an early sign of kidney damage [1]. - As the disease progresses, it often advances to **macroalbuminuria** (larger amounts of albumin), indicating more severe kidney damage [1]. *ACE inhibitors can reduce micro albuminuria* - **Angiotensin-converting enzyme (ACE) inhibitors** are a cornerstone of treatment for diabetic nephropathy due to their **renoprotective effects**. - They effectively reduce **glomerular hydrostatic pressure** and **albuminuria**, thereby slowing the progression of kidney disease.

Q: Which is the most common symptom of medullary sponge kidney disease?

UTI. ***UTI*** - **Medullary sponge kidney disease** often leads to **urinary stasis** within the dilated collecting ducts, creating a favorable environment for **bacterial growth** and recurrent **urinary tract infections (UTIs)** [1]. - The abnormal kidney structure and presence of stones can also cause **obstruction**, further increasing the risk of UTIs [1], [2]. *Anuria* - **Anuria**, the absence of urine production, is a severe symptom usually indicative of **acute kidney injury** or **bilateral urinary obstruction**. - While medullary sponge kidney can lead to complications, **anuria** is a rare initial or primary presentation. *Anemia* - **Anemia** in kidney disease is typically associated with **chronic kidney disease** stages where there is reduced **erythropoietin production**. - Medullary sponge kidney alone does not commonly cause significant **anemia**, unless it progresses to advanced chronic kidney disease, which is not its most common presentation. *Azotemia* - **Azotemia** refers to elevated levels of **nitrogenous waste products** (like urea and creatinine) in the blood, indicating **impaired kidney function**. - While medullary sponge kidney can sometimes lead to impaired function due to recurrent infections or stones, **azotemia** is not the most common direct symptom; **UTIs** are more frequent [2].

Question 1

Distal renal tubular acidosis is associated with:

Accepted Answer

Calcium stones

Answer

Hypocitraturia

Answer

Oxalate stones

Answer

Uric acid stones

Question 2

What is the best treatment for anemia in patients with Chronic Renal Failure (CRF)?

Accepted Answer

Erythropoietin Stimulating Agents

Answer

Oral Iron Therapy

Answer

Blood transfusion

Answer

Androgenic Steroids

Question 3

Which of the following electrolyte imbalances is least likely to be observed in Chronic Renal Failure (CRF)?

Accepted Answer

Hypercalcemia

Answer

Hyperkalemia

Answer

Hyperphosphatemia

Answer

Hypocalcemia

Question 4

Which of the following is a renal-specific nephropathy associated with HIV?

Accepted Answer

Focal Segmental Glomerulosclerosis (FSGS)

Answer

Mesangioproliferative Glomerulonephritis

Answer

Membranous Nephropathy

Answer

Membranoproliferative Glomerulonephritis (MPGN)

Question 5

Renal vein thrombosis is associated with all of the following conditions except:

Accepted Answer

Trauma

Answer

Nephrotic syndrome

Answer

Dehydration

Answer

Sickle cell anemia

Question 6

Most common cause of nephrotic syndrome in adults?

Accepted Answer

Focal Segmental Glomerulosclerosis (FSGS)

Answer

Minimal change disease

Answer

Acute GN

Answer

Membranous glomerulonephritis

Question 7

What is the frequency of renal involvement in Henoch-Schönlein purpura (HSP)?

Accepted Answer

40-60%

Answer

25-35%

Answer

60-80%

Answer

5-10%

Question 8

Which of the following is NOT a feature of hypernatremia?

Accepted Answer

Muscle weakness due to hypokalemia

Answer

Altered mental status

Answer

Elevated intracranial tension

Answer

Convulsions

Question 9

In diabetic nephropathy, all of the following are true, except:

Accepted Answer

Insulin requirement becomes high

Answer

Micro and macro albuminuria can occur

Answer

ACE inhibitors can reduce micro albuminuria

Answer

Cardiovascular abnormalities can occur

Question 10

Which is the most common symptom of medullary sponge kidney disease?

Accepted Answer

UTI

Answer

Anuria

Answer

Anemia

Answer

Azotemia

Nephrology — MCQs

Nephrology — MCQs

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