Drug-Induced Kidney Injury Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Drug-Induced Kidney Injury. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Drug-Induced Kidney Injury Indian Medical PG Question 1: Which of the following contrast agents is PREFERRED in a patient with renal dysfunction for the prevention of contrast-induced nephropathy?
- A. Iso-osmolar contrast (Correct Answer)
- B. High osmolar contrast
- C. Ionic contrast
- D. Low osmolar contrast
Drug-Induced Kidney Injury Explanation: ***Iso-osmolar contrast***
- **Iso-osmolar contrast agents** (e.g., iodixanol) have an osmolality of ~290 mOsm/kg, which is identical to that of plasma.
- **This is the PREFERRED choice** in patients with renal dysfunction as multiple studies demonstrate the lowest risk of contrast-induced nephropathy (CIN).
- The iso-osmolar formulation minimizes osmotic stress on renal tubules and reduces the risk of acute kidney injury.
- **Current guidelines recommend iso-osmolar agents as first-line** in high-risk patients with pre-existing renal impairment.
*Low osmolar contrast*
- **Low osmolar contrast agents** have osmolality of 600-900 mOsm/kg, which is significantly lower than high osmolar agents but still 2-3 times higher than plasma.
- While **acceptable and safer than high osmolar agents**, they are not as optimal as iso-osmolar contrast for patients with renal dysfunction.
- These agents are widely used and represent a reasonable alternative when iso-osmolar agents are not available.
*High osmolar contrast*
- **High osmolar contrast agents** have osmolality >1400 mOsm/kg (about 5 times that of plasma).
- They carry the **highest risk of contrast-induced nephropathy** due to severe osmotic load and direct tubular toxicity.
- **Contraindicated or strongly avoided** in patients with pre-existing renal dysfunction.
*Ionic contrast*
- **Ionic contrast** refers to the chemical structure (dissociates into ions) rather than osmolality.
- Can be either high or low osmolar—the ionic nature alone does not determine renal safety.
- The critical factor for nephrotoxicity prevention is osmolality, not ionic charge.
Drug-Induced Kidney Injury Indian Medical PG Question 2: Which of the following drugs is associated with an untoward side effect of renal tubular damage?
- A. Cisplatin (Correct Answer)
- B. Streptozocin
- C. Methysergide
- D. Cyclophosphamide
Drug-Induced Kidney Injury Explanation: ***Cisplatin***
- **Cisplatin** is the **classic and most prominent example** of a drug causing **direct renal tubular damage**, specifically **acute tubular necrosis (ATN)**
- Nephrotoxicity is **dose-limiting** and occurs in up to 30% of patients, making it the hallmark side effect
- Mechanism: Direct toxic injury to proximal and distal tubular epithelial cells with mitochondrial dysfunction
- Results in reduced GFR, electrolyte disturbances (hypomagnesemia, hypokalemia), and potentially irreversible renal impairment
- **Most closely associated** with the term "renal tubular damage" in medical education
*Streptozocin*
- Streptozocin is also nephrotoxic and can cause proximal tubular dysfunction
- However, it manifests more specifically as **Fanconi syndrome** (glycosuria, phosphaturia, aminoaciduria) rather than the classic acute tubular necrosis pattern
- Its toxicity profile is more complex, affecting both pancreatic beta cells and renal tubules
- While it causes tubular dysfunction, it is **not the primary drug** associated with direct tubular damage in standard teaching
*Methysergide*
- Methysergide causes **retroperitoneal fibrosis**, not direct renal tubular damage
- Kidney injury occurs **indirectly** through ureteral obstruction and compression
- Does not cause intrinsic tubular cell injury
*Cyclophosphamide*
- Primary toxicity is **hemorrhagic cystitis** due to acrolein metabolite affecting the bladder
- Does not cause significant direct renal tubular damage
- Renal effects are minimal compared to bladder toxicity, which can be prevented with hydration and mesna
Drug-Induced Kidney Injury Indian Medical PG Question 3: The most common form of acute kidney injury is:
- A. Prerenal azotemia (Correct Answer)
- B. Acute tubular injury
- C. Acute interstitial nephritis
- D. Acute glomerular disease
Drug-Induced Kidney Injury Explanation: ***Prerenal azotemia***
- This is the most prevalent form of **acute kidney injury (AKI)**, accounting for approximately 50-60% of all cases [1].
- It results from **decreased renal perfusion**, leading to reduced glomerular filtration without direct damage to the kidney parenchyma [1].
*Acute tubular injury*
- This is an **intrinsic form of AKI** characterized by damage to the renal tubules, often due to ischemia or nephrotoxins [1].
- While common, it is usually a consequence of prolonged or severe prerenal AKI, and thus not the *most* common initial cause [1].
*Acute interstitial nephritis*
- This involves inflammation of the kidney's **interstitial tissue**, often triggered by **allergic reactions to medications** or infections [2].
- It represents a smaller percentage of AKI cases compared to prerenal causes.
*Acute glomerular disease*
- This form of AKI involves direct injury to the **glomeruli**, such as in glomerulonephritis [2].
- While serious, glomerular diseases are significantly less common as a cause of overall AKI compared to prerenal factors.
Drug-Induced Kidney Injury Indian Medical PG Question 4: A 52-year-old man was referred to the clinic due to increased abdominal girth. He is diagnosed with ascites by the presence of a fluid thrill and shifting dullness on percussion. After administering diuretic therapy, which nursing action would be most effective in ensuring safe care for this patient?
- A. Measuring serum potassium for hypokalemia
- B. Assessing the client for hypovolemia
- C. Measuring the client’s weight weekly
- D. Documenting precise intake and output (Correct Answer)
Drug-Induced Kidney Injury Explanation: ***Documenting precise intake and output***
- **Accurate intake and output (I&O)** monitoring helps track fluid balance and the effectiveness of diuretic therapy in reducing ascites [1].
- This data is crucial for adjusting diuretic dosages and preventing complications like **dehydration** or **fluid overload** [2].
*Measuring serum potassium for hypokalemia*
- While monitoring electrolytes is important, **hypokalemia** is a potential side effect of some diuretics, but not the *most effective* immediate nursing action for *safe care* post-diuretic administration for ascites [3].
- This is an important monitoring parameter, but not the primary action for overall safe care in this context.
*Assessing the client for hypovolemia*
- **Hypovolemia** is a risk with aggressive diuretic therapy, but frequently reassessing **I&O** provides more concrete data to *prevent* this complication rather than just *assessing* for it after it may have started [1].
- While important, focusing on the *outcome* rather than the *preventative measure* makes it less effective as a primary safe care action.
*Measuring the client’s weight weekly*
- **Weekly weight measurement** is a useful tool for tracking fluid shifts over time but is not immediate enough to ensure *safe care* after diuretic administration [3].
- **Daily weight measurements** or even more frequent monitoring might be warranted, but precise **I&O** provides real-time data for fluid balance decisions.
Drug-Induced Kidney Injury Indian Medical PG Question 5: Drug causing oliguria through prostaglandin inhibition is:
- A. Aspirin (Correct Answer)
- B. Montelukast
- C. Diazepam
- D. Acyclovir
Drug-Induced Kidney Injury Explanation: ***Aspirin***
- **Aspirin** and other **NSAIDs** cause oliguria by **inhibiting cyclooxygenase (COX)**, which reduces prostaglandin synthesis
- Prostaglandins (especially PGE2 and PGI2) normally maintain renal vasodilation and adequate glomerular filtration
- **Inhibition leads to**: Afferent arteriolar vasoconstriction → ↓ Renal blood flow → ↓ GFR → **Oliguria**
- **High-risk patients**: Pre-existing renal disease, heart failure, volume depletion, elderly
- This is a **hemodynamic/functional** renal impairment
*Montelukast*
- **Leukotriene receptor antagonist** used for asthma and allergic rhinitis
- Acts on airways, not kidneys
- No significant association with oliguria or renal dysfunction
*Diazepam*
- **Benzodiazepine** acting on CNS GABA receptors
- Used for anxiety, seizures, muscle relaxation
- No direct renal effects or oliguria association
*Acyclovir*
- **Antiviral drug** that can cause nephrotoxicity via **crystal formation** in renal tubules (crystal nephropathy)
- Can lead to acute kidney injury and oliguria, especially with rapid IV infusion or dehydration
- However, mechanism is **direct tubular toxicity**, NOT prostaglandin inhibition
- The question specifically asks for prostaglandin-mediated oliguria, making **Aspirin** the correct answer
Drug-Induced Kidney Injury Indian Medical PG Question 6: Which of the following drugs shows nephrotoxicity during administration?
- A. Azathioprine
- B. Tacrolimus (Correct Answer)
- C. Mycophenolate mofetil
- D. Leflunomide
Drug-Induced Kidney Injury Explanation: ***Tacrolimus***
- **Tacrolimus** is a calcineurin inhibitor and a well-known cause of **nephrotoxicity**, which can manifest as acute kidney injury or chronic renal dysfunction [1], [4].
- Its mechanism involves vasoconstriction of afferent arterioles and direct tubular toxicity, leading to reduced glomerular filtration.
*Azathioprine*
- **Azathioprine** is an immunosuppressant primarily associated with **bone marrow suppression** (leukopenia, thrombocytopenia) and **hepatotoxicity**, not typically nephrotoxicity [2].
- While it can cause renal impairment in rare cases, it is not a primary mechanism of action.
*Mycophenolate mofetil*
- **Mycophenolate mofetil (MMF)** is an immunosuppressant that primarily causes **gastrointestinal side effects** (diarrhea, nausea) and **myelosuppression**.
- It is generally considered **renal-sparing** and is often used in situations where calcineurin inhibitors are contraindicated due to nephrotoxicity.
*Leflunomide*
- **Leflunomide** is an immunosuppressant used in rheumatoid arthritis, known for causing **hepatotoxicity**, **hypertension**, and **teratogenicity** [3].
- While it can affect various organ systems, direct and significant nephrotoxicity is not a prominent adverse effect.
Drug-Induced Kidney Injury Indian Medical PG Question 7: Which of the following drugs is associated with untoward side effect of renal tubular damage?
- A. Streptozotocin
- B. Methysergide
- C. Cyclophosphamide
- D. Cisplatin (Correct Answer)
Drug-Induced Kidney Injury Explanation: ***Cisplatin***
- **Cisplatin** is a platinum-based chemotherapy drug well-known for its dose-limiting nephrotoxicity, primarily causing **renal tubular damage**.
- Its mechanism involves direct DNA damage within renal tubular cells, leading to **acute tubular necrosis** if not managed with aggressive hydration and other protective measures.
*Streptozotocin*
- **Streptozotocin** is an alkylating agent primarily used in treating **pancreatic neuroendocrine tumors**; its main toxicity is typically to pancreatic beta cells (leading to hypoglycemia) and to the liver.
- While it can be nephrotoxic, its predominant and most recognized untoward side effect is not renal tubular damage, but rather **pancreatic beta-cell destruction**.
*Methysergide*
- **Methysergide** is an ergot alkaloid used for **migraine prophylaxis** but is largely discontinued due to severe side effects like **retroperitoneal fibrosis**.
- Renal damage in the context of methysergide is typically due to this fibrosis compressing the ureters, rather than direct tubular toxicity.
*Cyclophosphamide*
- **Cyclophosphamide** is an alkylating agent known for its immunosuppressive and chemotherapeutic effects; its major side effects include **hemorrhagic cystitis** and myelosuppression.
- While high doses can cause nephrotoxicity, its primary and most feared renal-related toxicity is hemorrhagic cystitis, not direct tubular damage as seen with cisplatin.
Drug-Induced Kidney Injury Indian Medical PG Question 8: Which drug is least likely to cause exanthematous skin eruptions?
- A. Phenytoin
- B. Ampicillin
- C. Phenylbutazone
- D. Hydrocortisone (Correct Answer)
Drug-Induced Kidney Injury Explanation: ***Hydrocortisone***
- **Corticosteroids** like hydrocortisone are **anti-inflammatory** and immunosuppressive agents.
- They are commonly used to **treat allergic reactions** and skin eruptions, making them highly unlikely to cause exanthematous eruptions themselves.
*Phenytoin*
- **Anticonvulsant** medications like phenytoin are frequently associated with various **drug-induced skin reactions**, including exanthematous eruptions.
- It is a common cause of **drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome**, which manifests with a widespread rash.
*Ampicillin*
- **Antibiotics**, particularly **aminopenicillins** like ampicillin, are well-known triggers for **maculopapular rashes** and other exanthematous eruptions.
- The incidence of ampicillin-induced rash is notably higher, especially in patients with **viral infections** like infectious mononucleosis.
*Phenylbutazone*
- This **non-steroidal anti-inflammatory drug (NSAID)** has a documented history of causing severe cutaneous adverse reactions, including **exanthematous eruptions**.
- Due to its potential for serious side effects, such as **aplastic anemia** and severe skin reactions, its use is now highly restricted.
Drug-Induced Kidney Injury Indian Medical PG Question 9: Ulipristal acetate (progesterone receptor modulator) should not be prescribed as emergency contraceptive in women with
- A. liver dysfunction (Correct Answer)
- B. glaucoma
- C. coagulopathy
- D. kidney failure
Drug-Induced Kidney Injury Explanation: ***Correct: liver dysfunction***
- **Ulipristal acetate** is extensively metabolized in the **liver** by the CYP450 enzyme system, predominantly CYP3A4.
- In individuals with **severe hepatic impairment**, the metabolism of ulipristal acetate can be impaired, leading to increased plasma concentrations and potential adverse effects.
- **Severe liver dysfunction** is a documented contraindication in product labeling.
*Incorrect: glaucoma*
- There is **no known contraindication** for ulipristal acetate use in individuals with **glaucoma**.
- Its mechanism of action primarily involves progesterone receptors and does not directly impact intraocular pressure.
*Incorrect: coagulopathy*
- Ulipristal acetate does **not significantly affect blood coagulation** parameters or platelet function.
- It is not contraindicated in individuals with **coagulopathy**, unlike some estrogen-containing contraceptives.
*Incorrect: kidney failure*
- While urinary excretion of ulipristal acetate metabolites occurs, the **primary elimination pathway is fecal** (approximately 90%).
- **Kidney failure** is not considered a contraindication, and dose adjustments are generally not required.
Drug-Induced Kidney Injury Indian Medical PG Question 10: Most common cause of postoperative renal failure:
- A. Decreased renal perfusion (Correct Answer)
- B. Toxicity of anesthetic drugs
- C. Toxicity of antibiotics
- D. None of the options
Drug-Induced Kidney Injury Explanation: **Decreased renal perfusion**
- **Hypovolemia** and **hypotension** during or after surgery are frequent causes of reduced blood flow to the kidneys, leading to **ischemic injury**.
- This inadequate perfusion results in **acute tubular necrosis (ATN)**, which is the most common intrinsic cause of postoperative acute renal failure.
- Accounts for the majority (50-80%) of postoperative acute kidney injury cases.
*Toxicity of anesthetic drugs*
- While some anesthetic agents, particularly older ones, could be nephrotoxic, modern anesthetics are generally **well-tolerated** by the kidneys and rarely cause direct renal failure.
- **Nephrotoxicity** from anesthetic drugs is an uncommon cause compared to the widespread issue of inadequate renal perfusion during surgical stress.
*Toxicity of antibiotics*
- Certain antibiotics, such as **aminoglycosides** (e.g., gentamicin) and **vancomycin**, are known to be nephrotoxic. However, their use is often monitored, and renal failure due to antibiotic toxicity is less common and often preventable compared to hypovolemia.
- **Antibiotic-induced nephrotoxicity** typically presents with ATN but is not the most frequent cause in the general postoperative population.
*None of the options*
- This option is incorrect because **decreased renal perfusion** is, in fact, a widely recognized and leading cause of postoperative renal failure.
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