Comprehensive Clinical Examination:
Acute Kidney Injury (AKI)
Module 1: AKI Overview & Pathophysiology
Question 1:
A 68-year-old male with a history of hypertension is
admitted with acute illness. Which of the following best
defines Acute Kidney Injury (AKI)?
A) A gradual, irreversible loss of nephron function over
months to years.
B) An abrupt (within 48 hours) reduction in kidney
function defined by elevated serum creatinine or
oliguria.
C) Isolated proteinuria without changes in glomerular
filtration rate.
D) Chronic glomerular sclerosis leading to end-stage
renal disease.
Correct Answer: B
Rationale: AKI is characterized by a rapid decline in
renal function occurring over hours to days, leading to
retention of nitrogenous wastes and electrolyte
imbalances.
Question 2:
,Question 2 scenario: In assessing a patient with
suspected prerenal AKI, what primary
pathophysiological mechanism is responsible?
A) Direct cellular toxicity to the tubular epithelium from
contrast media.
B) Obstruction of the urinary flow at the level of the
ureters.
C) Decreased effective arterial blood volume leading to
renal hypoperfusion without cellular necrosis.
D) Immune-complex deposition within the glomerular
basement membrane.
Correct Answer: C
Rationale: Prerenal AKI is caused by decreased renal
perfusion (e.g., volume depletion, heart failure), where
the parenchyma remains structurally intact initially.
Question 3:
Question 3 scenario: Which laboratory finding is most
characteristic of intrinsic acute tubular necrosis (ATN)
versus prerenal azotemia?
A) Urine sodium > 40 mEq/L and FeNa > 2%
B) Urine sodium < 20 mEq/L and FeNa < 1%
C) Elevated serum albumin with normal creatinine
D) High urine specific gravity (>1.030) with
concentrated urine
,Correct Answer: A
Rationale: In ATN, damaged tubules lose the ability to
reabsorb sodium, resulting in high fractional excretion
of sodium (FeNa > 2%) and elevated urine sodium (> 40
mEq/L).
Question 4:
Question 4 scenario: A patient presents with acute
bilateral flank pain, anuria, and prostatic enlargement.
This clinical presentation points toward which type of
AKI?
A) Prerenal azotemia
B) Acute interstitial nephritis
C) Postrenal (obstructive) AKI
D) Acute glomerulonephritis
Correct Answer: C
Rationale: Postrenal AKI results from urinary tract
obstruction (such as BPH, stones, or tumors),
presenting classically with sudden anuria or alternating
oliguria/polyuria and flank pain.
Question 5:
A 68-year-old male with a history of hypertension is
admitted with acute illness. Which of the following best
defines Acute Kidney Injury (AKI)?
, A) A gradual, irreversible loss of nephron function over
months to years.
B) An abrupt (within 48 hours) reduction in kidney
function defined by elevated serum creatinine or
oliguria.
C) Isolated proteinuria without changes in glomerular
filtration rate.
D) Chronic glomerular sclerosis leading to end-stage
renal disease.
Correct Answer: B
Rationale: AKI is characterized by a rapid decline in
renal function occurring over hours to days, leading to
retention of nitrogenous wastes and electrolyte
imbalances.
Question 6:
Question 6 scenario: In assessing a patient with
suspected prerenal AKI, what primary
pathophysiological mechanism is responsible?
A) Direct cellular toxicity to the tubular epithelium from
contrast media.
B) Obstruction of the urinary flow at the level of the
ureters.
C) Decreased effective arterial blood volume leading to
renal hypoperfusion without cellular necrosis.
Acute Kidney Injury (AKI)
Module 1: AKI Overview & Pathophysiology
Question 1:
A 68-year-old male with a history of hypertension is
admitted with acute illness. Which of the following best
defines Acute Kidney Injury (AKI)?
A) A gradual, irreversible loss of nephron function over
months to years.
B) An abrupt (within 48 hours) reduction in kidney
function defined by elevated serum creatinine or
oliguria.
C) Isolated proteinuria without changes in glomerular
filtration rate.
D) Chronic glomerular sclerosis leading to end-stage
renal disease.
Correct Answer: B
Rationale: AKI is characterized by a rapid decline in
renal function occurring over hours to days, leading to
retention of nitrogenous wastes and electrolyte
imbalances.
Question 2:
,Question 2 scenario: In assessing a patient with
suspected prerenal AKI, what primary
pathophysiological mechanism is responsible?
A) Direct cellular toxicity to the tubular epithelium from
contrast media.
B) Obstruction of the urinary flow at the level of the
ureters.
C) Decreased effective arterial blood volume leading to
renal hypoperfusion without cellular necrosis.
D) Immune-complex deposition within the glomerular
basement membrane.
Correct Answer: C
Rationale: Prerenal AKI is caused by decreased renal
perfusion (e.g., volume depletion, heart failure), where
the parenchyma remains structurally intact initially.
Question 3:
Question 3 scenario: Which laboratory finding is most
characteristic of intrinsic acute tubular necrosis (ATN)
versus prerenal azotemia?
A) Urine sodium > 40 mEq/L and FeNa > 2%
B) Urine sodium < 20 mEq/L and FeNa < 1%
C) Elevated serum albumin with normal creatinine
D) High urine specific gravity (>1.030) with
concentrated urine
,Correct Answer: A
Rationale: In ATN, damaged tubules lose the ability to
reabsorb sodium, resulting in high fractional excretion
of sodium (FeNa > 2%) and elevated urine sodium (> 40
mEq/L).
Question 4:
Question 4 scenario: A patient presents with acute
bilateral flank pain, anuria, and prostatic enlargement.
This clinical presentation points toward which type of
AKI?
A) Prerenal azotemia
B) Acute interstitial nephritis
C) Postrenal (obstructive) AKI
D) Acute glomerulonephritis
Correct Answer: C
Rationale: Postrenal AKI results from urinary tract
obstruction (such as BPH, stones, or tumors),
presenting classically with sudden anuria or alternating
oliguria/polyuria and flank pain.
Question 5:
A 68-year-old male with a history of hypertension is
admitted with acute illness. Which of the following best
defines Acute Kidney Injury (AKI)?
, A) A gradual, irreversible loss of nephron function over
months to years.
B) An abrupt (within 48 hours) reduction in kidney
function defined by elevated serum creatinine or
oliguria.
C) Isolated proteinuria without changes in glomerular
filtration rate.
D) Chronic glomerular sclerosis leading to end-stage
renal disease.
Correct Answer: B
Rationale: AKI is characterized by a rapid decline in
renal function occurring over hours to days, leading to
retention of nitrogenous wastes and electrolyte
imbalances.
Question 6:
Question 6 scenario: In assessing a patient with
suspected prerenal AKI, what primary
pathophysiological mechanism is responsible?
A) Direct cellular toxicity to the tubular epithelium from
contrast media.
B) Obstruction of the urinary flow at the level of the
ureters.
C) Decreased effective arterial blood volume leading to
renal hypoperfusion without cellular necrosis.
