1
NUR 2063 / NUR2063: Essentials of Pathophysiology
— Exam 2
Advanced Comprehensive Question Bank
Latest
v2.0
2025/2026
Curriculum | Rasmussen University
EXAM FOCUS AREAS
This advanced question bank integrates Fluid & Electrolyte Imbalances, Acid-Base Regulation,
Endocrine Disorders, Hematologic Disorders, Immunologic Disorders, Gastrointestinal
Disorders, Renal/Urinary Disorders, Cellular Regulation, Genetics, Inflammation/Immune
Responses, Neurological Disorders, Cardiovascular Disorders, and Respiratory Disorders with
emphasis on complex clinical scenarios, multi-system interactions, and advanced
pathophysiological concepts.
SECTION 1: FLUID & ELECTROLYTE IMBALANCES — ADVANCED
1. A 68-year-old patient with a history of heart failure and cirrhosis presents with generalized
edema, ascites, and jugular venous distension. Serum albumin is 2.1 g/dL (normal: 3.5–5.0),
and serum sodium is 128 mEq/L. Which combination of pathophysiological mechanisms best
explains this presentation?
A) Increased capillary hydrostatic pressure + decreased plasma oncotic pressure + dilutional
hyponatremia
B) Decreased capillary hydrostatic pressure + increased plasma oncotic pressure +
hypernatremia
C) Increased capillary permeability + increased plasma oncotic pressure + hypervolemia
D) Decreased capillary permeability + decreased plasma oncotic pressure + hyperosmolarity
- detailed 100% correctanswer :- A — Heart failure increases capillary hydrostatic
pressure (backward failure), cirrhosis decreases plasma oncotic pressure (reduced albumin
synthesis), and SIADH/water retention (common in heart failure and cirrhosis) causes dilutional
hyponatremia, collectively driving fluid into the interstitial space and creating third-space
accumulation.
, 2
2. A patient with small cell lung cancer presents with serum sodium of 112 mEq/L, serum
osmolality of 248 mOsm/kg, and urine osmolality of 600 mOsm/kg. The nurse understands
that the ectopic production of which substance is most likely responsible?
A) Atrial natriuretic peptide
B) Arginine vasopressin (ADH)
C) Aldosterone
D) Renin
- detailed 100% correctanswer :- B — Small cell lung cancer is the most common
cause of ectopic ADH secretion (SIADH), causing water retention, dilutional hyponatremia, low
serum osmolality, and inappropriately concentrated urine.
3. A 52-year-old patient with a history of alcohol use disorder presents with muscle weakness,
tremors, and paresthesias. Laboratory findings reveal serum magnesium of 1.2 mEq/L,
potassium of 3.0 mEq/L, and calcium of 7.8 mg/dL. Which of the following electrolyte
imbalances is the primary driver of the patient's hypocalcemia?
A) Hypermagnesemia
B) Hypomagnesemia
C) Hyperkalemia
D) Hyponatremia
- detailed 100% correctanswer :- B — Hypomagnesemia impairs PTH secretion and
causes end-organ resistance to PTH, leading to hypocalcemia. The triad of hypomagnesemia,
hypokalemia, and hypocalcemia is common in chronic alcoholism and refeeding syndrome.
4. A patient with severe vomiting has arterial blood gas results: pH 7.50, PaCO2 48, HCO3 34.
What is the primary compensatory mechanism occurring in this patient?
A) Hyperventilation to increase CO2 elimination
B) Renal retention of bicarbonate
C) Hypoventilation to retain CO2
D) Increased renal excretion of bicarbonate
- detailed 100% correctanswer :- C — Vomiting causes loss of gastric acid (HCl),
leading to metabolic alkalosis (elevated pH and HCO3). The respiratory system compensates by
, 3
hypoventilation, retaining CO2 (elevated PaCO2), which shifts the bicarbonate-carbonic acid
ratio toward normal.
5. A patient with chronic kidney disease (Stage 4) has serum potassium of 6.2 mEq/L, calcium
of 7.2 mg/dL, and phosphorus of 6.8 mg/dL. Which of the following ECG changes would the
nurse most likely observe?
A) Prominent U waves and ST depression
B) Tall peaked T waves and widened QRS complex
C) Prolonged QT interval
D) Flattened T waves with ST depression
- detailed 100% correctanswer :- B — Hyperkalemia (K >5.5) causes tall peaked T
waves initially, progressing to widened QRS complex, PR prolongation, and eventually sine wave
pattern and ventricular fibrillation. The concurrent hypocalcemia (low calcium) would cause QT
prolongation, but hyperkalemia typically shortens QT.
6. A patient is receiving total parenteral nutrition (TPN) and develops a serum phosphate level
of 1.8 mg/dL. Which of the following is the most concerning complication of this electrolyte
imbalance?
A) Cardiac arrhythmias
B) Respiratory muscle weakness and diaphragmatic fatigue
C) Seizures
D) Acute kidney injury
- detailed 100% correctanswer :- B — Hypophosphatemia (<2.5) causes ATP
depletion, impairing diaphragmatic contractility and leading to respiratory muscle weakness,
potentially causing respiratory failure. This is especially critical in patients receiving TPN who
develop refeeding syndrome.
7. A 45-year-old patient with severe burns develops hyponatremia with a serum sodium of
120 mEq/L. Which of the following best explains the pathophysiology of hyponatremia in this
patient?
A) Excessive sodium loss through the burn wound
B) Sodium shift into cells due to insulin release
, 4
C) ADH-mediated water retention due to hypovolemia
D) Decreased sodium intake
- detailed 100% correctanswer :- C — In severe burns, hypovolemia triggers
baroreceptor-mediated ADH release, causing water retention and dilutional hyponatremia.
Additionally, burn wounds lose sodium-rich fluid, but the primary mechanism is ADH-driven
water retention.
8. A patient with hyperaldosteronism (Conn's syndrome) has hypertension, hypokalemia, and
metabolic alkalosis. Which of the following pathophysiological mechanisms explains the
metabolic alkalosis?
A) Increased renal excretion of hydrogen ions
B) Decreased renal excretion of bicarbonate
C) Increased gastrointestinal loss of hydrogen ions
D) Respiratory compensation for metabolic acidosis
- detailed 100% correctanswer :- A — Aldosterone promotes sodium reabsorption in
exchange for potassium and hydrogen ion excretion in the collecting duct. Increased hydrogen
ion excretion leads to metabolic alkalosis (loss of acid = relative bicarbonate gain).
9. A patient receiving lithium therapy presents with polyuria, polydipsia, and serum sodium of
152 mEq/L. Which pathophysiological mechanism is most likely responsible?
A) Lithium-induced SIADH
B) Lithium-induced nephrogenic diabetes insipidus
C) Lithium-induced hyperglycemia causing osmotic diuresis
D) Lithium-induced pancreatitis
- detailed 100% correctanswer :- B — Lithium inhibits the renal response to ADH in
the collecting duct, causing nephrogenic diabetes insipidus, leading to large-volume dilute
urine, polydipsia, hypernatremia, and hyperosmolality.
10. A patient has the following laboratory findings: serum sodium 140 mEq/L, serum
osmolality 310 mOsm/kg, urine osmolality 850 mOsm/kg, urine sodium 20 mEq/L. Which of
the following best describes the clinical picture?
NUR 2063 / NUR2063: Essentials of Pathophysiology
— Exam 2
Advanced Comprehensive Question Bank
Latest
v2.0
2025/2026
Curriculum | Rasmussen University
EXAM FOCUS AREAS
This advanced question bank integrates Fluid & Electrolyte Imbalances, Acid-Base Regulation,
Endocrine Disorders, Hematologic Disorders, Immunologic Disorders, Gastrointestinal
Disorders, Renal/Urinary Disorders, Cellular Regulation, Genetics, Inflammation/Immune
Responses, Neurological Disorders, Cardiovascular Disorders, and Respiratory Disorders with
emphasis on complex clinical scenarios, multi-system interactions, and advanced
pathophysiological concepts.
SECTION 1: FLUID & ELECTROLYTE IMBALANCES — ADVANCED
1. A 68-year-old patient with a history of heart failure and cirrhosis presents with generalized
edema, ascites, and jugular venous distension. Serum albumin is 2.1 g/dL (normal: 3.5–5.0),
and serum sodium is 128 mEq/L. Which combination of pathophysiological mechanisms best
explains this presentation?
A) Increased capillary hydrostatic pressure + decreased plasma oncotic pressure + dilutional
hyponatremia
B) Decreased capillary hydrostatic pressure + increased plasma oncotic pressure +
hypernatremia
C) Increased capillary permeability + increased plasma oncotic pressure + hypervolemia
D) Decreased capillary permeability + decreased plasma oncotic pressure + hyperosmolarity
- detailed 100% correctanswer :- A — Heart failure increases capillary hydrostatic
pressure (backward failure), cirrhosis decreases plasma oncotic pressure (reduced albumin
synthesis), and SIADH/water retention (common in heart failure and cirrhosis) causes dilutional
hyponatremia, collectively driving fluid into the interstitial space and creating third-space
accumulation.
, 2
2. A patient with small cell lung cancer presents with serum sodium of 112 mEq/L, serum
osmolality of 248 mOsm/kg, and urine osmolality of 600 mOsm/kg. The nurse understands
that the ectopic production of which substance is most likely responsible?
A) Atrial natriuretic peptide
B) Arginine vasopressin (ADH)
C) Aldosterone
D) Renin
- detailed 100% correctanswer :- B — Small cell lung cancer is the most common
cause of ectopic ADH secretion (SIADH), causing water retention, dilutional hyponatremia, low
serum osmolality, and inappropriately concentrated urine.
3. A 52-year-old patient with a history of alcohol use disorder presents with muscle weakness,
tremors, and paresthesias. Laboratory findings reveal serum magnesium of 1.2 mEq/L,
potassium of 3.0 mEq/L, and calcium of 7.8 mg/dL. Which of the following electrolyte
imbalances is the primary driver of the patient's hypocalcemia?
A) Hypermagnesemia
B) Hypomagnesemia
C) Hyperkalemia
D) Hyponatremia
- detailed 100% correctanswer :- B — Hypomagnesemia impairs PTH secretion and
causes end-organ resistance to PTH, leading to hypocalcemia. The triad of hypomagnesemia,
hypokalemia, and hypocalcemia is common in chronic alcoholism and refeeding syndrome.
4. A patient with severe vomiting has arterial blood gas results: pH 7.50, PaCO2 48, HCO3 34.
What is the primary compensatory mechanism occurring in this patient?
A) Hyperventilation to increase CO2 elimination
B) Renal retention of bicarbonate
C) Hypoventilation to retain CO2
D) Increased renal excretion of bicarbonate
- detailed 100% correctanswer :- C — Vomiting causes loss of gastric acid (HCl),
leading to metabolic alkalosis (elevated pH and HCO3). The respiratory system compensates by
, 3
hypoventilation, retaining CO2 (elevated PaCO2), which shifts the bicarbonate-carbonic acid
ratio toward normal.
5. A patient with chronic kidney disease (Stage 4) has serum potassium of 6.2 mEq/L, calcium
of 7.2 mg/dL, and phosphorus of 6.8 mg/dL. Which of the following ECG changes would the
nurse most likely observe?
A) Prominent U waves and ST depression
B) Tall peaked T waves and widened QRS complex
C) Prolonged QT interval
D) Flattened T waves with ST depression
- detailed 100% correctanswer :- B — Hyperkalemia (K >5.5) causes tall peaked T
waves initially, progressing to widened QRS complex, PR prolongation, and eventually sine wave
pattern and ventricular fibrillation. The concurrent hypocalcemia (low calcium) would cause QT
prolongation, but hyperkalemia typically shortens QT.
6. A patient is receiving total parenteral nutrition (TPN) and develops a serum phosphate level
of 1.8 mg/dL. Which of the following is the most concerning complication of this electrolyte
imbalance?
A) Cardiac arrhythmias
B) Respiratory muscle weakness and diaphragmatic fatigue
C) Seizures
D) Acute kidney injury
- detailed 100% correctanswer :- B — Hypophosphatemia (<2.5) causes ATP
depletion, impairing diaphragmatic contractility and leading to respiratory muscle weakness,
potentially causing respiratory failure. This is especially critical in patients receiving TPN who
develop refeeding syndrome.
7. A 45-year-old patient with severe burns develops hyponatremia with a serum sodium of
120 mEq/L. Which of the following best explains the pathophysiology of hyponatremia in this
patient?
A) Excessive sodium loss through the burn wound
B) Sodium shift into cells due to insulin release
, 4
C) ADH-mediated water retention due to hypovolemia
D) Decreased sodium intake
- detailed 100% correctanswer :- C — In severe burns, hypovolemia triggers
baroreceptor-mediated ADH release, causing water retention and dilutional hyponatremia.
Additionally, burn wounds lose sodium-rich fluid, but the primary mechanism is ADH-driven
water retention.
8. A patient with hyperaldosteronism (Conn's syndrome) has hypertension, hypokalemia, and
metabolic alkalosis. Which of the following pathophysiological mechanisms explains the
metabolic alkalosis?
A) Increased renal excretion of hydrogen ions
B) Decreased renal excretion of bicarbonate
C) Increased gastrointestinal loss of hydrogen ions
D) Respiratory compensation for metabolic acidosis
- detailed 100% correctanswer :- A — Aldosterone promotes sodium reabsorption in
exchange for potassium and hydrogen ion excretion in the collecting duct. Increased hydrogen
ion excretion leads to metabolic alkalosis (loss of acid = relative bicarbonate gain).
9. A patient receiving lithium therapy presents with polyuria, polydipsia, and serum sodium of
152 mEq/L. Which pathophysiological mechanism is most likely responsible?
A) Lithium-induced SIADH
B) Lithium-induced nephrogenic diabetes insipidus
C) Lithium-induced hyperglycemia causing osmotic diuresis
D) Lithium-induced pancreatitis
- detailed 100% correctanswer :- B — Lithium inhibits the renal response to ADH in
the collecting duct, causing nephrogenic diabetes insipidus, leading to large-volume dilute
urine, polydipsia, hypernatremia, and hyperosmolality.
10. A patient has the following laboratory findings: serum sodium 140 mEq/L, serum
osmolality 310 mOsm/kg, urine osmolality 850 mOsm/kg, urine sodium 20 mEq/L. Which of
the following best describes the clinical picture?
