Assignment Level: Advanced

Difficulty: Advanced

Postgraduate self-assessment focused on Anti-GBM Disease. Complete all 10 questions to view detailed clinical explanations on the results page.

Anti-GBM Disease — Advanced

Advanced postgraduate nephrology self-assessment on Anti-GBM Disease. Difficulty: Advanced. Explanations are shown after quiz completion.

1 / 10

The defining pathogenic antibody in anti-GBM disease targets:

PLA2R

Double-stranded DNA

C3 nephritic factor

The alpha-3 chain of type IV collagen

Review the glomerular disease principles in this topic.

Correct: The alpha-3 chain of type IV collagen.

Autoantibodies commonly target the alpha-3 chain of type IV collagen in the GBM.

2 / 10

The classic kidney biopsy immunofluorescence pattern is:

Linear IgG staining along the GBM

Granular IgA mesangial staining

Full-house staining

No staining in all patients

Review the glomerular disease principles in this topic.

Correct: Linear IgG staining along the GBM.

Linear IgG staining reflects antibody binding along the glomerular basement membrane.

3 / 10

Anti-GBM disease may present with:

Only isolated nephrotic syndrome

Rapidly progressive GN with or without pulmonary hemorrhage

Chronic asymptomatic hypercalcemia

Pneumonia

Review the glomerular disease principles in this topic.

Correct: Rapidly progressive GN with or without pulmonary hemorrhage.

Pulmonary-renal syndrome is a severe and characteristic presentation, although renal-limited disease occurs.

4 / 10

When anti-GBM disease is strongly suspected, treatment should:

Wait several weeks for antibody results in all cases

Use ACE inhibitor alone

Begin urgently while confirmatory testing and biopsy are pursued

Avoid plasma exchange

Review the glomerular disease principles in this topic.

Correct: Begin urgently while confirmatory testing and biopsy are pursued.

Irreversible injury can progress rapidly; treatment is time-sensitive when clinical suspicion is high.

5 / 10

Standard initial treatment generally includes:

Diuretics alone

Antibiotics alone

Anticoagulation alone

Plasma exchange, glucocorticoids, and cyclophosphamide

Review the glomerular disease principles in this topic.

Correct: Plasma exchange, glucocorticoids, and cyclophosphamide.

The conventional regimen removes circulating antibody and suppresses new antibody production and inflammation.

6 / 10

Patients who are double-positive for ANCA and anti-GBM antibodies may have:

Features and relapse behavior requiring consideration of both diseases

No risk of relapse

Only membranous nephropathy

A benign serologic finding

Review the glomerular disease principles in this topic.

Correct: Features and relapse behavior requiring consideration of both diseases.

Double-positive disease can combine anti-GBM-type acute injury with ANCA-associated relapse risk.

7 / 10

Which biopsy feature predicts poor renal recovery in advanced anti-GBM disease?

A small number of cellular crescents only

Extensive crescents with global glomerulosclerosis and severe chronic scarring

Normal glomeruli

Mild mesangial expansion only

Review the glomerular disease principles in this topic.

Correct: Extensive crescents with global glomerulosclerosis and severe chronic scarring.

Extensive irreversible scarring and severe crescentic injury predict limited recovery.

8 / 10

In a patient with anti-GBM disease and life-threatening pulmonary hemorrhage, the urgent concern is:

Treatment of isolated hyperlipidemia

Avoidance of all immunosuppression

Control of pulmonary bleeding and preservation of kidney function

Routine outpatient observation

Review the glomerular disease principles in this topic.

Correct: Control of pulmonary bleeding and preservation of kidney function.

Pulmonary hemorrhage is life-threatening and requires urgent multidisciplinary management.

9 / 10

Before kidney transplantation after anti-GBM disease, clinicians generally seek:

Persistent high antibody levels

Active pulmonary hemorrhage

No immunologic assessment

Sustained seronegativity and clinical remission

Review the glomerular disease principles in this topic.

Correct: Sustained seronegativity and clinical remission.

Transplant timing is usually considered after antibodies have cleared and disease is clinically quiescent.

10 / 10

The key distinction between anti-GBM disease and immune-complex GN is:

Linear antibody deposition versus granular immune-complex deposition

The presence of edema alone

Serum sodium concentration

Urine volume by itself

Review the glomerular disease principles in this topic.

Correct: Linear antibody deposition versus granular immune-complex deposition.

Immunofluorescence pattern is a major diagnostic discriminator, interpreted with clinical and serologic data.

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Difficulty: Advanced

Postgraduate self-assessment focused on ANCA-Associated Glomerulonephritis. Complete all 10 questions to view detailed clinical explanations on the results page.

ANCA-Associated Glomerulonephritis — Advanced

Advanced postgraduate nephrology self-assessment on ANCA-Associated Glomerulonephritis. Difficulty: Advanced. Explanations are shown after quiz completion.

1 / 10

The typical light-microscopy pattern of ANCA-associated GN is:

Full-house immune-complex GN in every case

Membranous nephropathy

Pauci-immune necrotizing and crescentic GN

Amyloid deposition

Review the glomerular disease principles in this topic.

Correct: Pauci-immune necrotizing and crescentic GN.

ANCA-associated GN usually shows pauci-immune necrotizing and crescentic lesions.

2 / 10

Which presentation is most suggestive of ANCA-associated vasculitis?

Isolated nephrotic syndrome without inflammation

Stable microscopic hematuria for decades

Uncomplicated edema

Pulmonary-renal syndrome with rapidly progressive GN

Review the glomerular disease principles in this topic.

Correct: Pulmonary-renal syndrome with rapidly progressive GN.

Pulmonary hemorrhage with rapidly progressive GN is a classic severe phenotype.

3 / 10

Which antibody is associated with granulomatosis with polyangiitis?

PR3-ANCA

Anti-PLA2R

Anti-dsDNA only

Anti-mitochondrial antibody

Review the glomerular disease principles in this topic.

Correct: PR3-ANCA.

PR3-ANCA is associated particularly with granulomatosis with polyangiitis, although phenotype and testing must be integrated.

4 / 10

Which antibody is more often associated with microscopic polyangiitis?

Anti-GBM only

MPO-ANCA

Anti-centromere

Anti-CCP

Review the glomerular disease principles in this topic.

Correct: MPO-ANCA.

MPO-ANCA is commonly associated with microscopic polyangiitis and renal-limited vasculitis.

5 / 10

A positive ANCA test without compatible clinical features should be:

Considered diagnostic in every patient

Ignored even with pulmonary hemorrhage

Interpreted cautiously and not treated as vasculitis by itself

Used to diagnose membranous nephropathy

Review the glomerular disease principles in this topic.

Correct: Interpreted cautiously and not treated as vasculitis by itself.

ANCA assays have imperfect specificity and require clinical and histologic correlation.

6 / 10

For severe newly diagnosed ANCA-associated vasculitis, induction generally combines:

ACE inhibitor alone

Anticoagulation alone

No immunosuppression

Glucocorticoids with rituximab or cyclophosphamide

Review the glomerular disease principles in this topic.

Correct: Glucocorticoids with rituximab or cyclophosphamide.

Severe disease requires remission-induction immunosuppression, with regimen selection individualized.

7 / 10

Plasma exchange may be considered in selected ANCA-associated vasculitis patients with:

Severe kidney failure or diffuse alveolar hemorrhage in carefully selected contexts

Mild isolated arthralgia only

Stable microscopic hematuria only

Normal kidney function and no organ threat

Review the glomerular disease principles in this topic.

Correct: Severe kidney failure or diffuse alveolar hemorrhage in carefully selected contexts.

Plasma exchange is not routine for all patients but may be considered in selected high-risk presentations.

8 / 10

Which finding indicates chronic irreversible renal damage on biopsy?

Only cellular crescents

Global glomerulosclerosis and interstitial fibrosis

Fresh fibrinoid necrosis

Mild mesangial hypercellularity alone

Review the glomerular disease principles in this topic.

Correct: Global glomerulosclerosis and interstitial fibrosis.

Chronic scarring limits reversibility and informs prognosis and treatment decisions.

9 / 10

A major complication of rituximab or cyclophosphamide therapy is:

Guaranteed nephrolithiasis

Immediate correction of anemia

Serious infection and treatment-related cytopenias

Complete elimination of relapse risk

Review the glomerular disease principles in this topic.

Correct: Serious infection and treatment-related cytopenias.

Immunosuppression requires infection prophylaxis, blood-count monitoring, and malignancy-risk counseling.

10 / 10

Maintenance therapy after remission in ANCA-associated vasculitis is intended to:

Continue induction-dose cyclophosphamide indefinitely

Stop all monitoring

Treat only hyperlipidemia

Reduce relapse risk with a less toxic immunosuppressive strategy

Review the glomerular disease principles in this topic.

Correct: Reduce relapse risk with a less toxic immunosuppressive strategy.

Maintenance therapy reduces relapse while limiting cumulative toxicity.

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Difficulty: Advanced

Postgraduate self-assessment focused on Lupus Nephritis. Complete all 10 questions to view detailed clinical explanations on the results page.

Lupus Nephritis — Advanced

Advanced postgraduate nephrology self-assessment on Lupus Nephritis. Difficulty: Advanced. Explanations are shown after quiz completion.

1 / 10

Which renal biopsy class is defined by diffuse involvement of more than half of glomeruli?

Class I lupus nephritis

Class IV lupus nephritis

Class II lupus nephritis

Class V only

Review the glomerular disease principles in this topic.

Correct: Class IV lupus nephritis.

Class IV lupus nephritis is diffuse proliferative disease, defined by involvement of more than half of the glomeruli. It may show endocapillary proliferation, necrosis, crescents, and subendothelial deposits, and it carries substantial risk of kidney dysfunction. Classes I and II are mesangial, while class V is membranous.

2 / 10

Which serologic pattern commonly supports active lupus nephritis?

Negative ANA with isolated hyperkalemia

High C3 and C4 with no symptoms

Rising anti-dsDNA with falling complement

Positive anti-GBM alone

Review the glomerular disease principles in this topic.

Correct: Rising anti-dsDNA with falling complement.

Active systemic lupus commonly produces rising anti-dsDNA titers and falling complement, particularly C3 and C4, although these markers are imperfect. They should be interpreted with proteinuria, urinary sediment, blood pressure, eGFR, and clinical context rather than used alone to diagnose renal activity.

3 / 10

Class V lupus nephritis most closely resembles:

Minimal-change disease only

Anti-GBM disease

Amyloidosis

Membranous nephropathy with subepithelial deposits

Review the glomerular disease principles in this topic.

Correct: Membranous nephropathy with subepithelial deposits.

Class V lupus nephritis is the membranous form of lupus nephritis, with subepithelial immune deposits and a nephrotic presentation being common. It can coexist with a proliferative class, in which case management must reflect the proliferative component and the overall clinical severity.

4 / 10

A patient with SLE develops rapidly rising creatinine, hematuria, and cellular casts. The priority is:

Prompt kidney biopsy and assessment for active proliferative lupus nephritis

Observation for one year

Treatment as uncomplicated cystitis

Diuretic withdrawal only

Review the glomerular disease principles in this topic.

Correct: Prompt kidney biopsy and assessment for active proliferative lupus nephritis.

Rapidly rising creatinine with hematuria and cellular casts is a kidney emergency pattern consistent with active proliferative lupus nephritis or another rapidly progressive GN. Kidney biopsy helps determine the class, activity, and chronicity and guides treatment; delaying evaluation risks preventable irreversible scarring.

5 / 10

Induction therapy for active proliferative lupus nephritis generally includes immunosuppression plus:

A statin alone

Glucocorticoids with a steroid-sparing agent such as mycophenolate or cyclophosphamide

Antibiotics alone

No kidney-directed therapy

Review the glomerular disease principles in this topic.

Correct: Glucocorticoids with a steroid-sparing agent such as mycophenolate or cyclophosphamide.

Active proliferative lupus nephritis generally requires glucocorticoids plus an additional immunosuppressive agent such as mycophenolate or cyclophosphamide, with regimen selection based on severity, comorbidity, fertility considerations, and local protocols. Supportive care alone is inadequate for organ-threatening inflammation.

6 / 10

Hydroxychloroquine in SLE is generally used because it:

Directly removes immune deposits from glomeruli

Replaces all induction therapy

Reduces systemic disease activity and flare risk when appropriate

Treats hyperkalemia immediately

Review the glomerular disease principles in this topic.

Correct: Reduces systemic disease activity and flare risk when appropriate.

Hydroxychloroquine reduces lupus disease activity and flare risk and is generally continued unless contraindicated. It does not directly remove glomerular immune deposits or replace induction therapy for proliferative nephritis. Dose adjustment and ophthalmologic monitoring are important, especially in kidney impairment.

7 / 10

Which clinical feature increases concern for lupus nephritis progression?

Transient isolated headache

Normal urinalysis

Stable eGFR with absent albuminuria

Persistent proteinuria with active sediment and declining eGFR

Review the glomerular disease principles in this topic.

Correct: Persistent proteinuria with active sediment and declining eGFR.

Persistent proteinuria, active urinary sediment, hypertension, and falling eGFR together suggest ongoing renal injury and higher progression risk. A transient symptom or an isolated normal laboratory value does not exclude lupus nephritis, so trends and the complete renal assessment are essential.

8 / 10

A key safety issue during lupus nephritis immunosuppression is:

Infection prevention, vaccination planning, and reproductive counseling

Avoiding all blood tests

Ignoring leukopenia

Using live vaccines indiscriminately

Review the glomerular disease principles in this topic.

Correct: Infection prevention, vaccination planning, and reproductive counseling.

Immunosuppression increases the risk of bacterial, viral, and opportunistic infection and can affect fertility and pregnancy. Prevention includes vaccination planning, screening and prophylaxis when indicated, blood-count and liver monitoring, and shared reproductive counseling before therapy.

9 / 10

Repeat kidney biopsy may be useful in lupus nephritis when:

Every patient reaches remission

Clinical findings do not distinguish active inflammation from chronic scarring or relapse

Serum sodium changes by 1 mmol/L

There is isolated stable hypertension

Review the glomerular disease principles in this topic.

Correct: Clinical findings do not distinguish active inflammation from chronic scarring or relapse.

When worsening proteinuria or kidney function could represent active inflammation, chronic scarring, thrombotic microangiopathy, or a different lesion, repeat biopsy can clarify the mechanism. This distinction matters because active lesions may respond to immunosuppression, whereas chronic scarring is not reversed by escalating therapy.

10 / 10

Maintenance therapy after response in proliferative lupus nephritis commonly uses:

Indefinite high-dose cyclophosphamide in every patient

No therapy

Mycophenolate or an alternative maintenance immunosuppressant with ongoing monitoring

NSAIDs alone

Review the glomerular disease principles in this topic.

Correct: Mycophenolate or an alternative maintenance immunosuppressant with ongoing monitoring.

After induction response, maintenance treatment with mycophenolate or another appropriate immunosuppressant reduces relapse risk while limiting cumulative toxicity. Long-term care also includes hydroxychloroquine when appropriate, blood-pressure and proteinuria control, infection prevention, reproductive planning, and serial assessment of renal activity.

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Postgraduate self-assessment focused on Membranous Nephropathy. Complete all 10 questions to view detailed clinical explanations on the results page.

Membranous Nephropathy — Advanced

Advanced postgraduate nephrology self-assessment on Membranous Nephropathy. Difficulty: Advanced. Explanations are shown after quiz completion.

1 / 10

Which biopsy finding is characteristic of membranous nephropathy?

Subepithelial immune deposits with diffuse GBM thickening

Mesangial IgA deposits only

Linear IgG along the GBM in every case

Isolated crescents without deposits

Review the glomerular disease principles in this topic.

Correct: Subepithelial immune deposits with diffuse GBM thickening.

Membranous nephropathy is defined by diffuse capillary-wall thickening caused by subepithelial immune deposits. On electron microscopy the deposits lie outside the GBM, while light microscopy shows thickened loops and immunofluorescence shows granular immunoglobulin and complement. Mesangial-only disease, linear staining, and isolated crescents indicate different or additional processes.

2 / 10

The most useful circulating antigen-specific test in primary membranous nephropathy is:

Anti-GBM antibody

Anti-PLA2R antibody

Anti-dsDNA antibody

ANCA

Review the glomerular disease principles in this topic.

Correct: Anti-PLA2R antibody.

Anti-PLA2R antibodies are the principal disease-specific circulating marker for primary membranous nephropathy. A positive result supports the diagnosis in the right clinical setting and can help follow immunologic activity, but it does not eliminate the need to consider secondary disease, especially when clinical features are atypical.

3 / 10

A major complication of nephrotic membranous nephropathy is:

Central diabetes insipidus

Severe respiratory alkalosis

Venous thromboembolism

Community-acquired pneumonia

Review the glomerular disease principles in this topic.

Correct: Venous thromboembolism.

Nephrotic membranous nephropathy produces urinary loss of anticoagulant proteins and platelet-hypercoagulability, with risk amplified by severe hypoalbuminemia. Deep-vein thrombosis, pulmonary embolism, and renal-vein thrombosis are important complications; the risk should be assessed alongside bleeding risk before prophylaxis.

4 / 10

Before labeling membranous nephropathy primary, clinicians should evaluate for:

Adrenal insufficiency

Only urinary obstruction

No secondary causes if PLA2R is positive

Secondary causes including malignancy, infection, drugs, and autoimmune disease

Review the glomerular disease principles in this topic.

Correct: Secondary causes including malignancy, infection, drugs, and autoimmune disease.

Membranous nephropathy may be secondary to malignancy, hepatitis B or C, autoimmune disease such as lupus, or medication exposure. The evaluation should be guided by age, symptoms, examination, serology, imaging, and medication history. A PLA2R result is helpful but is not a substitute for clinical assessment of secondary causes.

5 / 10

The immunofluorescence pattern in membranous nephropathy is typically:

Granular IgG and C3 along capillary walls

Linear IgG only

Exclusive C1q in tubules

No staining in all cases

Review the glomerular disease principles in this topic.

Correct: Granular IgG and C3 along capillary walls.

Granular capillary-wall staining for IgG and C3 reflects immune-complex deposition along the subepithelial side of the glomerular capillary wall. This contrasts with the smooth linear IgG pattern of anti-GBM disease and the dominant IgA or C3 patterns seen in other glomerular diseases.

6 / 10

An advanced risk assessment for membranous nephropathy should integrate:

Serum sodium alone

Proteinuria, eGFR, serum albumin, antibody status, and disease trajectory

Urine color alone

Body weight without kidney data

Review the glomerular disease principles in this topic.

Correct: Proteinuria, eGFR, serum albumin, antibody status, and disease trajectory.

Risk assessment is dynamic. Persistent proteinuria, reduced eGFR, low albumin, high or persistent anti-PLA2R activity, and an unfavorable trajectory identify patients at greater risk of progression and may support immunosuppression. No single measurement, including antibody status alone, captures total risk.

7 / 10

Which treatment principle is appropriate for all patients with membranous nephropathy?

Immediate cytotoxic therapy for every patient

Avoidance of renin-angiotensin system blockade in all cases

Optimized supportive care including blood-pressure and proteinuria management

No thrombosis assessment

Review the glomerular disease principles in this topic.

Correct: Optimized supportive care including blood-pressure and proteinuria management.

Supportive therapy is required regardless of whether immunosuppression is used. It includes blood-pressure and proteinuria reduction, lipid management, edema treatment, vaccination and infection-risk assessment, and individualized thrombosis evaluation. Immunosuppression is reserved for patients whose risk-benefit profile justifies it.

8 / 10

A patient with primary membranous nephropathy and severe nephrotic syndrome develops acute flank pain and hematuria. Consider:

Pulmonary hemorrhage

Isolated cystitis only

Hyperthyroidism

Renal-vein thrombosis

Review the glomerular disease principles in this topic.

Correct: Renal-vein thrombosis.

Severe nephrotic syndrome is strongly associated with venous thromboembolism, including renal-vein thrombosis. Acute flank pain, hematuria, or sudden deterioration should prompt urgent evaluation rather than attribution to uncomplicated edema. Imaging and anticoagulation decisions must account for kidney function and bleeding risk.

9 / 10

Which finding would favor secondary rather than primary membranous nephropathy?

A systemic lupus phenotype with positive disease-specific serology

Isolated PLA2R positivity without other features

Stable blood pressure

No medication exposure

Review the glomerular disease principles in this topic.

Correct: A systemic lupus phenotype with positive disease-specific serology.

Systemic lupus features, hypocomplementemia, disease-specific autoantibodies, medication exposure, infection, and malignancy clues favor secondary membranous nephropathy. Primary disease is more likely when the clinical context and immunopathology support it, but no isolated finding should override the full evaluation.

10 / 10

When monitoring membranous nephropathy, a falling anti-PLA2R titer may indicate:

Immediate irreversible kidney failure

Immunologic remission preceding reduction in proteinuria

New anti-GBM disease by definition

Resolution of all secondary risks

Review the glomerular disease principles in this topic.

Correct: Immunologic remission preceding reduction in proteinuria.

A falling anti-PLA2R titer often represents immunologic response and may precede a measurable fall in proteinuria by months. It is therefore useful for monitoring, but it does not prove complete clinical remission; albuminuria, serum albumin, eGFR, and complications still require follow-up.

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Advanced nephrology self-assessment icon

Cardiorenal Syndrome — Advanced

Difficulty: Advanced

Postgraduate nephrology self-assessment with 10 single-best-answer MCQs. Explanations are shown after quiz completion.

Cardiorenal Syndrome — Advanced

Postgraduate nephrology self-assessment on Cardiorenal Syndrome. Difficulty: Advanced. Explanations are shown after quiz completion.

1 / 10

Type 1 cardiorenal syndrome refers to:

Chronic kidney disease causing chronic anemia only

Acute cardiac dysfunction causing acute kidney injury

Primary liver failure causing edema

Isolated urinary obstruction

Review the key principles in this topic.

Correct: Acute cardiac dysfunction causing acute kidney injury.

Type 1 cardiorenal syndrome is acute worsening of cardiac function leading to acute kidney injury.

2 / 10

In acute decompensated heart failure with congestion, the kidney injury is often driven by:

Only low dietary protein

High serum albumin

Venous congestion and increased renal interstitial pressure

Primary hyperthyroidism

Review the key principles in this topic.

Correct: Venous congestion and increased renal interstitial pressure.

Renal venous congestion and elevated intra-abdominal pressure can reduce effective renal perfusion and filtration.

3 / 10

A rise in creatinine during effective decongestion should be interpreted with:

An automatic diagnosis of tubular necrosis

The assumption that all diuresis must stop

Serum sodium alone

The overall congestion status and clinical response

Review the key principles in this topic.

Correct: The overall congestion status and clinical response.

Modest creatinine changes during successful decongestion do not always represent harmful structural injury.

4 / 10

Which biomarker pattern most strongly suggests hemoconcentration during decongestion?

Rising hematocrit and albumin with weight loss

Falling hematocrit with weight gain

Stable weight with severe edema

High amylase only

Review the key principles in this topic.

Correct: Rising hematocrit and albumin with weight loss.

Hemoconcentration can accompany effective fluid removal and should be interpreted alongside symptoms and perfusion.

5 / 10

A patient with heart failure and CKD has persistent congestion despite loop diuretic therapy. A reasonable strategy is:

Stop all diuretics immediately

Assess adherence, dose, absorption, and consider sequential nephron blockade

Give unlimited free water

Use NSAIDs to improve renal blood flow

Review the key principles in this topic.

Correct: Assess adherence, dose, absorption, and consider sequential nephron blockade.

Persistent congestion requires assessment of loop diuretic delivery and, when appropriate, additional natriuretic strategies with monitoring.

6 / 10

Which medication class can worsen renal perfusion in selected congested patients and should be reviewed?

Topical moisturizers

Inhaled saline

NSAIDs

Routine vitamins

Review the key principles in this topic.

Correct: NSAIDs.

NSAIDs can impair renal vasodilation and sodium excretion and may worsen both heart failure and kidney function.

7 / 10

In chronic cardiorenal syndrome, a key management principle is:

Treat the creatinine in isolation

Avoid blood-pressure control

Ignore albuminuria

Treat both cardiac disease and modifiable kidney risk factors

Review the key principles in this topic.

Correct: Treat both cardiac disease and modifiable kidney risk factors.

Cardiorenal care requires integrated management of congestion, cardiac function, blood pressure, diabetes, albuminuria, and medication safety.

8 / 10

Which finding suggests true hypoperfusion rather than isolated congestion?

Hypotension with cool extremities and altered mentation

Warm extremities with improving dyspnea

Weight loss and improved edema

Stable blood pressure with better exercise tolerance

Review the key principles in this topic.

Correct: Hypotension with cool extremities and altered mentation.

Clinical signs of shock or hypoperfusion require urgent reassessment of diuresis, cardiac output, and vasoactive support.

9 / 10

SGLT2 inhibitors in appropriate heart failure and CKD patients generally:

Cause nephrotic syndrome in all patients

Reduce heart-failure and kidney disease progression risk

Replace all diuretics

Are used only for hypernatremia

Review the key principles in this topic.

Correct: Reduce heart-failure and kidney disease progression risk.

SGLT2 inhibitors provide cardiorenal protection in appropriate patients, although initiation requires attention to volume status and contraindications.

10 / 10

When evaluating worsening kidney function during heart-failure treatment, the clinician should first:

Assume irreversible CKD

Stop all guideline-directed therapy

Assess volume status, hemodynamics, medications, and obstruction

Ignore urine findings

Review the key principles in this topic.

Correct: Assess volume status, hemodynamics, medications, and obstruction.

Worsening kidney function has multiple possible causes and should be evaluated using clinical, laboratory, medication, and imaging data.

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Advanced MCQs for Nephrologists

Apply advanced acid–base reasoning to mixed disorders, anion-gap analysis, renal tubular physiology, toxicology, and complex metabolic disturbances.

Acid–Base Disorders — Advanced

Difficulty: Advanced

Test advanced clinical reasoning in mixed acid–base disorders, anion-gap analysis, renal tubular physiology, toxicology, and complex metabolic disturbances. This quiz contains 10 single-best-answer questions. Explanations are shown after quiz completion.

1 / 10

A patient has Na 140, Cl 100, HCO3 12 mEq/L, and albumin 4.0 g/dL. Which interpretation is most accurate?

High-anion-gap metabolic acidosis with an anion gap of 28 mEq/L

Normal-anion-gap metabolic acidosis with an anion gap of 12 mEq/L

Metabolic alkalosis with an anion gap of 28 mEq/L

Respiratory acidosis with complete compensation

The anion gap is 140 − (100 + 12) = 28 mEq/L, indicating a high-anion-gap metabolic acidosis. Albumin is normal, so no albumin correction is required.

2 / 10

A patient with diabetic ketoacidosis has Na 140, Cl 90, and HCO3 10 mEq/L. What does the delta ratio most strongly suggest?

A concurrent metabolic alkalosis or chronic respiratory acidosis

A pure high-anion-gap metabolic acidosis

A concurrent normal-anion-gap metabolic acidosis only

Primary respiratory alkalosis without metabolic disease

The AG is 40 and the delta ratio is approximately (40−12)/(24−10)=2.0, suggesting an additional metabolic alkalosis or chronic respiratory acidosis rather than a pure ketoacidosis.

3 / 10

For a patient with metabolic acidosis and HCO3 of 10 mEq/L, Winter’s expected PCO2 is approximately 23 ± 2 mmHg. The measured PCO2 is 38 mmHg. What is the best interpretation?

Concurrent primary respiratory acidosis

Concurrent primary respiratory alkalosis

Appropriate respiratory compensation

Concurrent metabolic alkalosis

A measured PCO2 substantially above Winter’s expected range indicates an additional primary respiratory acidosis.

4 / 10

A patient has severe metabolic alkalosis, urine chloride 8 mEq/L, and a history of repeated vomiting. Which mechanism and treatment are most appropriate?

Chloride depletion with volume contraction; saline and potassium repletion

Mineralocorticoid excess; immediate acetazolamide alone

Advanced renal failure; hypertonic saline

Primary respiratory alkalosis; controlled hypoventilation

Low urine chloride in this context indicates chloride-responsive, volume-contraction alkalosis. Isotonic saline and potassium chloride address the maintenance mechanisms.

5 / 10

A malnourished patient with short-bowel syndrome develops episodic confusion and high-anion-gap metabolic acidosis after carbohydrate intake. Which metabolite is most likely responsible?

D-lactate

Beta-hydroxybutyrate only

Formate

Oxalate

Short-bowel syndrome can permit colonic bacterial production and absorption of D-lactate, causing episodic neurologic symptoms and high-anion-gap acidosis.

6 / 10

A patient using large amounts of toluene-containing solvent develops hypokalemic hyperchloremic metabolic acidosis with a positive urine anion gap and hippuric acid in urine. Which renal lesion is most likely?

Distal renal tubular acidosis with impaired ammonium excretion

Proximal renal tubular acidosis from bicarbonate wasting only

Type 4 renal tubular acidosis from hypoaldosteronism

No renal tubular disorder; this is isolated lactic acidosis

Toluene metabolism produces hippurate and can cause distal RTA, hypokalemia, and impaired urinary ammonium excretion; the positive urine anion gap supports low NH4+ excretion.

7 / 10

A patient with suspected proximal renal tubular acidosis has a plasma bicarbonate of 14 mEq/L and urine pH 5.0. Which statement is most accurate?

The urine can be appropriately acidified once plasma bicarbonate is depleted

A urine pH below 5.5 excludes proximal RTA

The finding proves distal RTA

The patient must have type 4 RTA

In proximal RTA, urine pH can fall below 5.5 after plasma bicarbonate falls below the reduced reabsorptive threshold; bicarbonate wasting is the primary defect.

8 / 10

A patient presents after salicylate overdose with pH 7.45, PCO2 20 mmHg, and HCO3 14 mEq/L. Which acid–base disorder is most likely?

A mixed respiratory alkalosis and high-anion-gap metabolic acidosis

A simple compensated metabolic acidosis

A simple compensated respiratory alkalosis

A mixed respiratory acidosis and metabolic alkalosis

Salicylates stimulate respiratory drive causing respiratory alkalosis and impair oxidative metabolism, producing a concurrent high-anion-gap metabolic acidosis.

9 / 10

A patient receiving massive transfusion develops worsening metabolic acidosis, rising total calcium, and impaired citrate metabolism in severe liver failure. Which mechanism best explains the acid–base disturbance?

Accumulation of citrate and its metabolites due to impaired hepatic clearance

Loss of gastric hydrochloric acid

Excess renal ammonium excretion

Primary increase in distal hydrogen secretion

Citrate accumulates when hepatic metabolism is impaired; citrate chelates calcium and may contribute to metabolic disturbances during massive transfusion.

10 / 10

A patient with persistent hyperchloremic metabolic acidosis has urine pH 6.5, positive urine anion gap, and no diarrhea. Which diagnosis is most likely?

Distal renal tubular acidosis

Proximal renal tubular acidosis with complete bicarbonate depletion

Gastrointestinal bicarbonate loss

Isolated respiratory alkalosis

A persistently high urine pH with positive urine anion gap indicates impaired ammonium excretion and inability to acidify urine, supporting distal RTA.

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Assignment Level: Advanced

Cardiorenal Syndrome — Advanced

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