Chronic Kidney Disease — MCQs
A hypertensive diabetic patient with microalbuminuria should receive:
A CKD patient develops serum K+ 7.2 mEq/L without ECG changes. Best initial management?
All should be features of a substance to measure GFR, except?
Which of the following is NOT a common cause of acute renal failure?
What is the most common cause of chronic renal failure?
Hyperkalemia aciduria is seen in
Metabolic complications in chronic renal failure include all of the following except:
Which of the following is the most accurate measure of Glomerular Filtration Rate (GFR)?
In a child, non-functioning kidney is best diagnosed by:
At what glomerular filtration rate (GFR) is the term "end-stage renal disease (ESRD)" typically classified?
Chronic Kidney Disease Indian Medical PG Practice Questions and MCQs
Question 1: A hypertensive diabetic patient with microalbuminuria should receive:
- A. Losartan (Correct Answer)
- B. Clonidine
- C. Metoprolol
- D. Amlodipine
Explanation: ***Losartan*** - **Losartan** is an **Angiotensin Receptor Blocker (ARB)**, which is a preferred treatment for hypertension in diabetic patients with microalbuminuria due to its **renoprotective effects**. - ARBs work by blocking the effects of **angiotensin II**, leading to **vasodilation** and a reduction in **glomerular hypertension**, thereby slowing the progression of diabetic nephropathy [2]. *Clonidine* - **Clonidine** is a centrally acting alpha-2 agonist, which can be used for hypertension but is not a first-line agent, especially in diabetic patients with microalbuminuria. - It is associated with side effects such as **sedation** and **rebound hypertension** if discontinued abruptly, and lacks the specific renoprotective benefits of ARBs. *Metoprolol* - **Metoprolol** is a **beta-blocker** that can be used for hypertension but is generally not the first choice for diabetic patients with microalbuminuria due to lack of specific renoprotective effects seen with ARBs [1]. - Beta-blockers can **mask symptoms of hypoglycemia** in diabetic patients and may also worsen **insulin resistance** in some individuals. *Amlodipine* - **Amlodipine** is a **calcium channel blocker** that is effective in lowering blood pressure but does not offer the same **renoprotective benefits** as ARBs in diabetic patients with microalbuminuria. - While safe for use in diabetics, it does not specifically address the underlying **glomerular hyperfiltration** associated with early diabetic kidney disease.
Question 2: A CKD patient develops serum K+ 7.2 mEq/L without ECG changes. Best initial management?
- A. Emergency dialysis
- B. Sodium polystyrene
- C. Insulin with glucose
- D. Calcium gluconate (Correct Answer)
Explanation: **Calcium gluconate** - **Calcium gluconate** is the best initial management for severe hyperkalemia, particularly when the potassium level is very high (above 6.5 mEq/L) even without ECG changes [1]. It acts quickly to directly stabilize the cardiac membrane by **antagonizing the effects of potassium on myocardial excitability**, thereby preventing life-threatening arrhythmias [1]. - It provides immediate cardioprotection, buying time for other therapies to shift potassium into cells or remove it from the body. *Emergency dialysis* - While **dialysis** is the most effective way to remove potassium from the body, it is typically reserved for cases of severe, refractory hyperkalemia, or when other therapies have failed [3]. - It is not the *initial* management for immediate cardiac stabilization, especially if no ECG changes are present and calcium can be administered more rapidly. *Sodium polystyrene* - **Sodium polystyrene sulfonate (Kayexalate)** is a potassium-binding resin that works in the gastrointestinal tract to exchange sodium for potassium, thus removing potassium from the body. - Its onset of action is slow (hours to days), making it inappropriate for acute, severe hyperkalemia requiring immediate intervention. *Insulin with glucose* - **Insulin with glucose** therapy promotes the intracellular shift of potassium, temporarily lowering serum potassium levels [2]. - While effective, its onset of action is typically 15-30 minutes, and it functions as a temporary measure to redistribute potassium, not to acutely stabilize the cardiac membrane, which is the primary concern when potassium is severely elevated.
Question 3: All should be features of a substance to measure GFR, except?
- A. Freely reabsorbed (Correct Answer)
- B. Not secreted by kidney
- C. Freely filtered across the glomerulus membrane
- D. None of the options
Explanation: ***Freely reabsorbed*** - A substance used to measure GFR should **not be reabsorbed** by the kidney tubules. If it were reabsorbed, the amount excreted in the urine would be less than the amount filtered, leading to an **underestimation of GFR**. - The ideal GFR marker is **neither reabsorbed nor secreted**, ensuring that its excretion rate directly reflects the filtration rate. *Freely filtered across the glomerulus membrane* - For a substance to accurately measure GFR, it must be **freely filtered** from the blood into the Bowman's capsule, without any restriction due to its size or charge. - This ensures that its concentration in the glomerular filtrate is the same as in the plasma, allowing for a direct calculation of the filtration rate. *Not secreted by kidney* - An ideal GFR marker should **not be secreted** by the renal tubules, as active secretion would add to the amount excreted in the urine, leading to an **overestimation of GFR**. - This property, along with not being reabsorbed, ensures that the amount of the substance appearing in the urine solely reflects the amount filtered. *None of the options* - This option is incorrect because there is a definitive feature listed among the choices that is *not* a characteristic of an ideal GFR marker. The ability to be "freely reabsorbed" is a disqualifying trait.
Question 4: Which of the following is NOT a common cause of acute renal failure?
- A. Chronic kidney disease due to analgesic nephropathy (Correct Answer)
- B. Acute pyelonephritis
- C. Acute kidney injury from snakebite
- D. Acute kidney injury due to rhabdomyolysis
Explanation: 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]
Question 5: What is the most common cause of chronic renal failure?
- A. Glomerulonephritis (acute to chronic)
- B. Chronic pyelonephritis
- C. Diabetes mellitus (Correct Answer)
- D. Hypertensive renal disease
Explanation: ***Diabetes mellitus*** - **Diabetes mellitus** is the leading cause of **chronic renal failure (CRF)**, responsible for approximately 45-50% of all cases [2]. - Both type 1 and type 2 diabetes can lead to **diabetic nephropathy**, a progressive kidney disease that ultimately results in end-stage renal disease (ESRD) [1], [2]. *Glomerulonephritis (acute to chronic)* - While various forms of **glomerulonephritis** can cause chronic renal failure, they collectively account for a smaller percentage compared to diabetes. - The progression from acute to chronic glomerulonephritis is not as prevalent as diabetic nephropathy in the overall etiology of CRF. *Chronic pyelonephritis* - **Chronic pyelonephritis**, an infection-related kidney scarring, is a cause of CRF but is less common than diabetes and hypertension as primary drivers. - It often results from recurrent **urinary tract infections (UTIs)** and **vesicoureteral reflux**. *Hypertensive renal disease* - **Hypertension** is the second most common cause of CRF, often co-occurring with diabetes or contributing independently to renal damage [1], [2]. - Untreated or poorly controlled hypertension leads to **nephrosclerosis**, a hardening of the small arteries in the kidneys, impairing their function over time.
Question 6: Hyperkalemia aciduria is seen in
- A. Type I Renal Tubular Acidosis
- B. Type IV Renal Tubular Acidosis (Correct Answer)
- C. Sigmoidocolostomy procedure
- D. Type II Renal Tubular Acidosis
Explanation: Type IV Renal Tubular Acidosis - This condition is characterized by **hyperkalemia** and **aciduria**, often due to a deficiency in aldosterone or a renal tubular insensitivity to aldosterone [1]. - The impaired aldosterone action leads to reduced potassium excretion and decreased ammonium production, both contributing to **hyperkalemia** and metabolic acidosis [1]. *Type I Renal Tubular Acidosis* - Type I RTA (distal RTA) is characterized by a defect in acid secretion in the distal tubule, leading to **hypokalemia** and metabolic acidosis with persistently high urine pH [2]. - Patients typically excrete an alkaline urine despite systemic acidosis, contrasting with the aciduria seen with hyperkalemia [2]. *Sigmoidocolostomy procedure* - A sigmoidocolostomy can lead to **hyperchloremic metabolic acidosis** due to the reabsorption of chloride and excretion of bicarbonate by the colonic mucosa. - However, it typically causes **hypokalemia** as potassium is secreted into the colonic lumen from the blood. *Type II Renal Tubular Acidosis* - Type II RTA (proximal RTA) involves a defect in bicarbonate reabsorption in the proximal tubule, resulting in **hypokalemia** and metabolic acidosis. - The kidney's ability to acidify urine is still largely intact in the distal nephron once the bicarbonate buffer system is overwhelmed.
Question 7: Metabolic complications in chronic renal failure include all of the following except:
- A. Hyperkalemia
- B. Hypocalcemia
- C. Hypokalemia (Correct Answer)
- D. Hypophosphataemia
Explanation: ***Hypokalemia*** - Chronic renal failure primarily leads to an inability to excrete **potassium**, resulting in **hyperkalemia**, not hypokalemia. - While very specific conditions or medications in ESRD could rarely cause hypokalemia, it is not a typical metabolic complication of chronic kidney disease itself. *Hyperkalemia* - **Renal excretion** is the primary mechanism for potassium balance, and with kidney failure, this process is impaired. - This impaired excretion leads to an accumulation of **potassium** in the blood, causing hyperkalemia. *Hypocalcemia* - The failing kidneys are unable to convert **25-hydroxyvitamin D** to its active form, **1,25-dihydroxyvitamin D**, leading to reduced calcium absorption [1]. - Additionally, hyperphosphatemia (due to impaired phosphate excretion) can bind with calcium and also stimulates parathyroid hormone release, contributing to **hypocalcemia** [1]. *Hypophosphataemia* - Chronic renal failure typically causes **hyperphosphatemia** due to the kidneys' inability to adequately excrete phosphate [1]. - Only in specific and rare instances or aggressive phosphate binding therapy might hypophosphatemia occur, but it is not a characteristic metabolic complication of CKD [2].
Question 8: Which of the following is the most accurate measure of Glomerular Filtration Rate (GFR)?
- A. Cystatin C
- B. Serum creatinine
- C. Creatinine Clearance
- D. Iothalamate Clearance (Correct Answer)
Explanation: ***Iothalamate Clearance*** - **Iothalamate clearance** is considered the **gold standard** for directly measuring GFR in clinical practice because it is a substance that is freely filtered by the glomerulus and is neither reabsorbed nor secreted by the renal tubules. - This method provides the most accurate and precise assessment of kidney function by quantifying the actual GFR, often used in research settings or for precise diagnosis. - **Note:** Inulin clearance is the traditional reference standard, but iothalamate is more practical and widely used clinically as it can be measured using radioactive or non-radioactive methods. *Serum creatinine* - **Serum creatinine** is a commonly used biomarker but is an **imperfect measure** of GFR because it can be influenced by factors like muscle mass, diet, and certain medications. - Its levels can remain within the normal range even when GFR has significantly decreased, especially in the early stages of kidney disease. *Cystatin C* - **Cystatin C** is a protein produced by most nucleated cells and is also freely filtered by the glomerulus, with less influence from muscle mass and diet compared to creatinine. - While considered a better marker than serum creatinine, it is still an **estimated measure** and is more expensive and less widely available than creatinine, and can be affected by inflammation or thyroid dysfunction. *Creatinine Clearance* - **Creatinine clearance** (often estimated using urine and serum creatinine levels over a timed collection) attempts to approximate GFR but can be **inaccurate** due to incomplete urine collection and tubular secretion of creatinine. - The **creatinine secretion** by the renal tubules leads to an overestimation of the true GFR, making it less accurate than direct measurement methods.
Question 9: In a child, non-functioning kidney is best diagnosed by:
- A. Ultrasonography
- B. IVU
- C. Creatinine clearance
- D. DTPA renogram (Correct Answer)
Explanation: ***DTPA renogram*** - A **DTPA (diethylenetriamine pentaacetic acid) renogram** is a nuclear medicine study that assesses **renal blood flow**, **glomerular filtration**, and urinary drainage. It directly measures the function of each kidney by quantifying tracer uptake and excretion, making it ideal for diagnosing a non-functioning kidney in a child. - The test provides information on the **relative function** of each kidney and outflow obstruction, which is crucial for determining if a kidney is truly non-functioning rather than just poorly visualized. *Ultrasonography* - While ultrasound can visualize the **anatomy** of the kidney (size, shape, presence of hydronephrosis), it does not directly assess renal function. - It may show a small, atrophic, or poorly developed kidney, but cannot definitively determine if it is non-functioning without functional studies. *IVU (Intravenous Urogram)* - An **IVU** relies on the kidneys' ability to excrete contrast material, which is visualized by X-ray. If a kidney is non-functioning, it will not excrete the contrast, leading to non-visualization. - However, IVU exposes the child to **radiation** and **iodinated contrast**, and newer, safer, and more precise functional studies like renograms are preferred, especially in pediatric cases where radiation exposure should be minimized. *Creatinine clearance* - **Creatinine clearance** is a measure of overall **glomerular filtration rate (GFR)** for both kidneys combined. - It does not provide information on the individual function of each kidney, so it cannot diagnose a non-functioning unilateral kidney.
Question 10: At what glomerular filtration rate (GFR) is the term "end-stage renal disease (ESRD)" typically classified?
- A. less than 15% of normal (Correct Answer)
- B. 10%—25% of normal
- C. 15%—25% of normal
- D. 5%—10% of normal
Explanation: ***Less than 15% of normal*** - **End-stage renal disease (ESRD)** is defined by a **glomerular filtration rate (GFR)** that falls below **15 mL/min/1.73 m²**, which is approximately **less than 15% of normal function**. - At this stage, **renal replacement therapy** (dialysis or transplantation) is typically required to sustain life. *15%—25% of normal* - This GFR range (15-25 mL/min/1.73 m²) corresponds to **Stage 4 chronic kidney disease (CKD)**, which is severe but not yet formally "end-stage." - Patients in this stage require careful monitoring and management, but may not immediately need renal replacement therapy. *10%—25% of normal* - This range overlaps with both **severe CKD (Stage 4)** and the beginning of **ESRD (Stage 5)**, but it is not the precise definition for ESRD. - The critical threshold for ESRD is uniformly established as GFR below 15 mL/min/1.73 m². *5%—10% of normal* - While a GFR in this range certainly indicates **ESRD**, the official classification includes any GFR **below 15% of normal** (or below 15 mL/min/1.73 m²), making "less than 15%" the most accurate and inclusive answer. - This smaller range describes a more advanced state within ESRD, but not the general definition.
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