NSG527 Midterm Exam Review Question Bank
(Latest 2026/2027 Edition) – Questions, Answers
& Detailed Rationales
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SECTION 1: Advanced Pathophysiology and Disease Processes
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Question 1
A 62-year-old patient with a 30-pack-year smoking history presents with dyspnea,
chronic cough, and barrel-shaped chest. Arterial blood gas analysis reveals pH 7.35,
PaCO₂ 52 mmHg, and HCO₃⁻ 30 mEq/L. Which pathophysiological process best
explains these findings?
A. Decreased surface area for gas exchange with chronic hypoventilation and renal
compensation
B. Increased alveolar-capillary membrane thickness causing acute respiratory alkalosis
C. Left ventricular failure leading to pulmonary edema and metabolic acidosis
D. Bronchial hyperreactivity causing episodic hypoxemia without CO₂ retention
Correct Answer:
A — Decreased surface area for gas exchange with chronic hypoventilation and renal
compensation
Rationale:
The findings are classic for chronic obstructive pulmonary disease (COPD) with
emphysema. The barrel chest indicates air trapping, while the elevated PaCO₂ with
compensated metabolic alkalosis reflects chronic hypoventilation. The kidneys
compensate by retaining bicarbonate. Option D is incorrect because bronchial
,hyperreactivity describes asthma, which typically presents with episodic symptoms and
normal or low PaCO₂ between attacks.
Question 2
A patient with type 2 diabetes mellitus presents with fasting blood glucose of 180
mg/dL, polyuria, and blurred vision. Which cellular mechanism primarily contributes to
the polyuria observed in this patient?
A. Osmotic diuresis due to glucose exceeding renal tubular reabsorption capacity
B. Decreased antidiuretic hormone secretion from posterior pituitary dysfunction
C. Increased proximal tubule sodium reabsorption causing water retention
D. Reduced glomerular filtration rate leading to concentrated urine output
Correct Answer:
A — Osmotic diuresis due to glucose exceeding renal tubular reabsorption capacity
Rationale:
When blood glucose exceeds approximately 180 mg/dL, the renal threshold for glucose
reabsorption is surpassed, causing glucosuria. The osmotic pull of glucose in the
tubules prevents water reabsorption, resulting in polyuria. Option B describes diabetes
insipidus, not diabetes mellitus. Option C is incorrect because increased sodium
reabsorption would decrease urine output, not increase it.
Question 3
A 45-year-old patient with hypertension is found to have a serum potassium level of 3.2
mEq/L while taking a thiazide diuretic. Which physiological mechanism explains this
electrolyte disturbance?
A. Increased distal tubular sodium delivery promoting potassium secretion via
aldosterone
B. Direct inhibition of the sodium-potassium ATPase pump in the collecting duct
C. Decreased glomerular filtration rate reducing potassium excretion
,D. Enhanced parathyroid hormone secretion increasing renal potassium wasting
Correct Answer:
A — Increased distal tubular sodium delivery promoting potassium secretion via
aldosterone
Rationale:
Thiazide diuretics inhibit sodium reabsorption in the distal convoluted tubule, increasing
sodium delivery to the collecting duct. This stimulates aldosterone-sensitive potassium
secretion. Option B describes digoxin toxicity, not thiazide mechanism. Option C is
incorrect because reduced GFR would decrease potassium excretion, potentially
causing hyperkalemia.
Question 4
A patient with chronic heart failure develops peripheral edema and ascites. Which
Starling force alteration is the primary contributor to this fluid accumulation?
A. Increased capillary hydrostatic pressure from elevated venous pressure
B. Decreased plasma oncotic pressure from hepatic synthetic dysfunction
C. Increased lymphatic drainage capacity overwhelming interstitial fluid removal
D. Decreased interstitial hydrostatic pressure from tissue compression
Correct Answer:
A — Increased capillary hydrostatic pressure from elevated venous pressure
Rationale:
In heart failure, impaired cardiac output leads to venous congestion and elevated
capillary hydrostatic pressure, which promotes fluid filtration into interstitial spaces.
While decreased oncotic pressure (Option B) can cause edema, it is not the primary
mechanism in uncomplicated heart failure. Option C is incorrect because lymphatic
drainage is typically overwhelmed, not enhanced.
Question 5
, A 58-year-old patient with atherosclerosis experiences sudden onset of chest pain
radiating to the left arm. ECG reveals ST-segment elevation in leads V1-V4. Which
pathophysiological event most likely initiated this acute coronary syndrome?
A. Plaque rupture with thrombus formation causing complete coronary occlusion
B. Vasospastic contraction of the coronary artery without underlying plaque disease
C. Progressive luminal narrowing from smooth muscle cell proliferation alone
D. Coronary artery dissection from connective tissue degeneration
Correct Answer:
A — Plaque rupture with thrombus formation causing complete coronary occlusion
Rationale:
ST-elevation myocardial infarction (STEMI) typically results from acute plaque rupture
exposing thrombogenic material, triggering platelet aggregation and thrombus
formation that completely occludes the coronary artery. Option B describes Prinzmetal's
angina, which causes transient ST changes without persistent elevation. Option C
describes stable angina pathophysiology, not acute infarction.
Question 6
A patient with cirrhosis develops asterixis and confusion. Laboratory studies reveal
elevated ammonia levels. Which hepatic dysfunction primarily contributes to this
neuropsychiatric presentation?
A. Impaired urea cycle function with shunting of portal blood past hepatocytes
B. Excessive glucagon secretion stimulating hepatic glycogenolysis
C. Decreased bile acid synthesis causing fat malabsorption and vitamin deficiency
D. Increased albumin production leading to hyperviscosity syndrome
Correct Answer:
A — Impaired urea cycle function with shunting of portal blood past hepatocytes
Rationale:
(Latest 2026/2027 Edition) – Questions, Answers
& Detailed Rationales
──────────────────────────────
SECTION 1: Advanced Pathophysiology and Disease Processes
──────────────────────────────
Question 1
A 62-year-old patient with a 30-pack-year smoking history presents with dyspnea,
chronic cough, and barrel-shaped chest. Arterial blood gas analysis reveals pH 7.35,
PaCO₂ 52 mmHg, and HCO₃⁻ 30 mEq/L. Which pathophysiological process best
explains these findings?
A. Decreased surface area for gas exchange with chronic hypoventilation and renal
compensation
B. Increased alveolar-capillary membrane thickness causing acute respiratory alkalosis
C. Left ventricular failure leading to pulmonary edema and metabolic acidosis
D. Bronchial hyperreactivity causing episodic hypoxemia without CO₂ retention
Correct Answer:
A — Decreased surface area for gas exchange with chronic hypoventilation and renal
compensation
Rationale:
The findings are classic for chronic obstructive pulmonary disease (COPD) with
emphysema. The barrel chest indicates air trapping, while the elevated PaCO₂ with
compensated metabolic alkalosis reflects chronic hypoventilation. The kidneys
compensate by retaining bicarbonate. Option D is incorrect because bronchial
,hyperreactivity describes asthma, which typically presents with episodic symptoms and
normal or low PaCO₂ between attacks.
Question 2
A patient with type 2 diabetes mellitus presents with fasting blood glucose of 180
mg/dL, polyuria, and blurred vision. Which cellular mechanism primarily contributes to
the polyuria observed in this patient?
A. Osmotic diuresis due to glucose exceeding renal tubular reabsorption capacity
B. Decreased antidiuretic hormone secretion from posterior pituitary dysfunction
C. Increased proximal tubule sodium reabsorption causing water retention
D. Reduced glomerular filtration rate leading to concentrated urine output
Correct Answer:
A — Osmotic diuresis due to glucose exceeding renal tubular reabsorption capacity
Rationale:
When blood glucose exceeds approximately 180 mg/dL, the renal threshold for glucose
reabsorption is surpassed, causing glucosuria. The osmotic pull of glucose in the
tubules prevents water reabsorption, resulting in polyuria. Option B describes diabetes
insipidus, not diabetes mellitus. Option C is incorrect because increased sodium
reabsorption would decrease urine output, not increase it.
Question 3
A 45-year-old patient with hypertension is found to have a serum potassium level of 3.2
mEq/L while taking a thiazide diuretic. Which physiological mechanism explains this
electrolyte disturbance?
A. Increased distal tubular sodium delivery promoting potassium secretion via
aldosterone
B. Direct inhibition of the sodium-potassium ATPase pump in the collecting duct
C. Decreased glomerular filtration rate reducing potassium excretion
,D. Enhanced parathyroid hormone secretion increasing renal potassium wasting
Correct Answer:
A — Increased distal tubular sodium delivery promoting potassium secretion via
aldosterone
Rationale:
Thiazide diuretics inhibit sodium reabsorption in the distal convoluted tubule, increasing
sodium delivery to the collecting duct. This stimulates aldosterone-sensitive potassium
secretion. Option B describes digoxin toxicity, not thiazide mechanism. Option C is
incorrect because reduced GFR would decrease potassium excretion, potentially
causing hyperkalemia.
Question 4
A patient with chronic heart failure develops peripheral edema and ascites. Which
Starling force alteration is the primary contributor to this fluid accumulation?
A. Increased capillary hydrostatic pressure from elevated venous pressure
B. Decreased plasma oncotic pressure from hepatic synthetic dysfunction
C. Increased lymphatic drainage capacity overwhelming interstitial fluid removal
D. Decreased interstitial hydrostatic pressure from tissue compression
Correct Answer:
A — Increased capillary hydrostatic pressure from elevated venous pressure
Rationale:
In heart failure, impaired cardiac output leads to venous congestion and elevated
capillary hydrostatic pressure, which promotes fluid filtration into interstitial spaces.
While decreased oncotic pressure (Option B) can cause edema, it is not the primary
mechanism in uncomplicated heart failure. Option C is incorrect because lymphatic
drainage is typically overwhelmed, not enhanced.
Question 5
, A 58-year-old patient with atherosclerosis experiences sudden onset of chest pain
radiating to the left arm. ECG reveals ST-segment elevation in leads V1-V4. Which
pathophysiological event most likely initiated this acute coronary syndrome?
A. Plaque rupture with thrombus formation causing complete coronary occlusion
B. Vasospastic contraction of the coronary artery without underlying plaque disease
C. Progressive luminal narrowing from smooth muscle cell proliferation alone
D. Coronary artery dissection from connective tissue degeneration
Correct Answer:
A — Plaque rupture with thrombus formation causing complete coronary occlusion
Rationale:
ST-elevation myocardial infarction (STEMI) typically results from acute plaque rupture
exposing thrombogenic material, triggering platelet aggregation and thrombus
formation that completely occludes the coronary artery. Option B describes Prinzmetal's
angina, which causes transient ST changes without persistent elevation. Option C
describes stable angina pathophysiology, not acute infarction.
Question 6
A patient with cirrhosis develops asterixis and confusion. Laboratory studies reveal
elevated ammonia levels. Which hepatic dysfunction primarily contributes to this
neuropsychiatric presentation?
A. Impaired urea cycle function with shunting of portal blood past hepatocytes
B. Excessive glucagon secretion stimulating hepatic glycogenolysis
C. Decreased bile acid synthesis causing fat malabsorption and vitamin deficiency
D. Increased albumin production leading to hyperviscosity syndrome
Correct Answer:
A — Impaired urea cycle function with shunting of portal blood past hepatocytes
Rationale:
