Pathophysiology Nursing Exam – Complete
Exam 12 with Verified Answers (2026 Edition)
Question 1: A client is diagnosed with syndrome of inappropriate antidiuretic hormone (SIADH). Which
pathophysiological mechanism is responsible for the client's hyponatremia?
A) Excessive ADH secretion leading to water retention
B) Decreased ADH secretion leading to water loss
C) Excessive aldosterone secretion leading to sodium retention
D) Decreased aldosterone secretion leading to sodium loss
Answer: A) Excessive ADH secretion leading to water retention
Rationale: SIADH is characterized by excessive secretion of antidiuretic hormone (ADH), leading to water
retention and dilutional hyponatremia. The retained water dilutes the sodium concentration in the blood.
This condition is often caused by tumors (small cell lung cancer), central nervous system disorders, or
medications. The nurse should monitor for signs of hyponatremia, including confusion, seizures, and
coma.
Question 2: A client with chronic kidney disease develops metabolic acidosis. Which compensatory
mechanism does the body employ?
A) Hyperventilation to blow off CO2
B) Hypoventilation to retain CO2
C) Increased renal excretion of bicarbonate
D) Decreased renal excretion of hydrogen ions
Answer: A) Hyperventilation to blow off CO2
Rationale: In metabolic acidosis, the body compensates by hyperventilating (increasing respiratory rate)
to blow off CO2, which raises blood pH. This is called respiratory compensation. The respiratory system is
the first line of compensation for metabolic acidosis. Hypoventilation would worsen acidosis. Increased
renal excretion of bicarbonate and decreased renal excretion of hydrogen ions are not compensatory
mechanisms.
Question 3: A client with liver cirrhosis develops hepatic encephalopathy. Which substance is primarily
responsible for the neurological symptoms?
A) Ammonia
B) Bilirubin
C) Albumin
D) Globulin
,Answer: A) Ammonia
Rationale: Hepatic encephalopathy is caused by the accumulation of ammonia in the blood. The liver
normally converts ammonia to urea, which is excreted by the kidneys. In cirrhosis, the liver cannot
perform this function, leading to elevated ammonia levels. Ammonia crosses the blood-brain barrier and
causes neurological symptoms, including confusion, altered mental status, and coma.
Question 4: A client with type 1 diabetes develops diabetic ketoacidosis (DKA). Which metabolic change
leads to the development of ketoacidosis?
A) Increased fatty acid metabolism producing ketone bodies
B) Increased glucose metabolism producing lactic acid
C) Decreased fatty acid metabolism producing ketone bodies
D) Decreased glucose metabolism producing lactic acid
Answer: A) Increased fatty acid metabolism producing ketone bodies
Rationale: In DKA, the lack of insulin leads to increased fatty acid metabolism in the liver, producing
ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone). These ketone bodies are acids that
accumulate in the blood, causing metabolic acidosis. The nurse should monitor for signs of DKA,
including hyperglycemia, ketonuria, and Kussmaul respirations.
Question 5: A client with heart failure develops pulmonary edema. Which pathophysiological
mechanism is responsible for fluid accumulation in the lungs?
A) Increased left ventricular pressure transmitted to the pulmonary capillaries
B) Decreased left ventricular pressure transmitted to the pulmonary capillaries
C) Increased right ventricular pressure transmitted to the systemic circulation
D) Decreased right ventricular pressure transmitted to the systemic circulation
Answer: A) Increased left ventricular pressure transmitted to the pulmonary capillaries
Rationale: In heart failure, the left ventricle cannot pump blood effectively forward, leading to increased
left ventricular pressure. This pressure is transmitted backward to the left atrium, pulmonary veins, and
pulmonary capillaries, causing fluid to leak into the alveoli and resulting in pulmonary edema. The nurse
should monitor for signs of pulmonary edema, including dyspnea, crackles, and pink frothy sputum.
Question 6: A client with chronic obstructive pulmonary disease (COPD) develops cor pulmonale. Which
pathophysiological change leads to this complication?
A) Pulmonary hypertension causing right ventricular hypertrophy
B) Pulmonary hypotension causing right ventricular atrophy
C) Systemic hypertension causing left ventricular hypertrophy
D) Systemic hypotension causing left ventricular atrophy
,Answer: A) Pulmonary hypertension causing right ventricular hypertrophy
Rationale: Cor pulmonale is right-sided heart failure caused by pulmonary hypertension. In COPD, chronic
hypoxemia causes pulmonary vasoconstriction, leading to increased pulmonary vascular resistance and
pulmonary hypertension. The right ventricle must work harder to pump blood against this increased
resistance, leading to right ventricular hypertrophy and eventually failure.
Question 7: A client with acute pancreatitis develops hypocalcemia. Which pathophysiological
mechanism is responsible?
A) Binding of calcium to fatty acids in necrotic fat tissue (saponification)
B) Decreased production of parathyroid hormone (PTH)
C) Increased renal excretion of calcium
D) Decreased dietary intake of calcium
Answer: A) Binding of calcium to fatty acids in necrotic fat tissue (saponification)
Rationale: In acute pancreatitis, necrotic fat tissue releases fatty acids, which bind to calcium ions,
forming calcium soaps (saponification). This reduces ionized calcium in the blood, causing hypocalcemia.
The nurse should monitor for signs of hypocalcemia, including muscle twitching, tetany, and Chvostek's
sign.
Question 8: A client with sepsis develops disseminated intravascular coagulation (DIC). Which
pathophysiological mechanism is responsible for the bleeding and clotting?
A) Excessive activation of the coagulation cascade leading to consumption of clotting factors and
platelets
B) Decreased activation of the coagulation cascade leading to increased clotting factors and platelets
C) Excessive activation of the fibrinolytic system leading to decreased clotting factors
D) Decreased activation of the fibrinolytic system leading to increased clotting factors
Answer: A) Excessive activation of the coagulation cascade leading to consumption of clotting factors
and platelets
Rationale: DIC is characterized by widespread activation of the coagulation cascade, leading to the
formation of microvascular thrombi. This consumes clotting factors and platelets, leading to bleeding.
Sepsis triggers the release of inflammatory cytokines that activate the coagulation system. The nurse
should monitor for signs of bleeding, thrombosis, and organ dysfunction.
Question 9: A client with chronic kidney disease develops hyperphosphatemia. Which
pathophysiological mechanism is responsible?
A) Decreased renal excretion of phosphate
B) Increased renal excretion of phosphate
, C) Decreased dietary intake of phosphate
D) Increased parathyroid hormone (PTH) levels
Answer: A) Decreased renal excretion of phosphate
Rationale: In chronic kidney disease, the kidneys cannot excrete phosphate effectively, leading to
hyperphosphatemia. Decreased renal excretion is the primary mechanism. Increased renal excretion and
decreased dietary intake would lead to hypophosphatemia. Increased PTH levels are a response to
hyperphosphatemia and hypocalcemia, not the cause.
Question 10: A client with asthma experiences an acute exacerbation. Which pathophysiological change
occurs during an asthma attack?
A) Bronchoconstriction, inflammation, and mucus production
B) Bronchodilation and decreased airway resistance
C) Alveolar collapse and decreased lung compliance
D) Destruction of alveolar walls and decreased elastic recoil
Answer: A) Bronchoconstriction, inflammation, and mucus production
Rationale: An asthma exacerbation is characterized by bronchoconstriction, airway inflammation, and
increased mucus production. These changes narrow the airways, increase airway resistance, and make
breathing difficult. Bronchodilation would improve symptoms. Alveolar collapse and destruction of
alveolar walls are characteristic of other respiratory conditions.
Question 11: A client with type 2 diabetes develops peripheral neuropathy. Which pathophysiological
mechanism is responsible?
A) Microvascular damage causing ischemia to peripheral nerves
B) Direct toxic effect of glucose on nerve cells
C) Immune-mediated destruction of nerve cells
D) Vitamin B12 deficiency due to diabetic diet
Answer: A) Microvascular damage causing ischemia to peripheral nerves
Rationale: Diabetic peripheral neuropathy is caused by microvascular damage leading to ischemia of the
peripheral nerves. Hyperglycemia damages small blood vessels that supply the nerves, leading to
impaired nerve function. The nurse should assess for signs of neuropathy, including numbness, tingling,
and pain in the extremities, and provide education on foot care to prevent complications.
Question 12: A client with heart failure develops atrial fibrillation. Which pathophysiological mechanism
is responsible for this arrhythmia?
A) Atrial stretch causing electrical instability
B) Decreased cardiac output causing ischemia of the conduction system
Exam 12 with Verified Answers (2026 Edition)
Question 1: A client is diagnosed with syndrome of inappropriate antidiuretic hormone (SIADH). Which
pathophysiological mechanism is responsible for the client's hyponatremia?
A) Excessive ADH secretion leading to water retention
B) Decreased ADH secretion leading to water loss
C) Excessive aldosterone secretion leading to sodium retention
D) Decreased aldosterone secretion leading to sodium loss
Answer: A) Excessive ADH secretion leading to water retention
Rationale: SIADH is characterized by excessive secretion of antidiuretic hormone (ADH), leading to water
retention and dilutional hyponatremia. The retained water dilutes the sodium concentration in the blood.
This condition is often caused by tumors (small cell lung cancer), central nervous system disorders, or
medications. The nurse should monitor for signs of hyponatremia, including confusion, seizures, and
coma.
Question 2: A client with chronic kidney disease develops metabolic acidosis. Which compensatory
mechanism does the body employ?
A) Hyperventilation to blow off CO2
B) Hypoventilation to retain CO2
C) Increased renal excretion of bicarbonate
D) Decreased renal excretion of hydrogen ions
Answer: A) Hyperventilation to blow off CO2
Rationale: In metabolic acidosis, the body compensates by hyperventilating (increasing respiratory rate)
to blow off CO2, which raises blood pH. This is called respiratory compensation. The respiratory system is
the first line of compensation for metabolic acidosis. Hypoventilation would worsen acidosis. Increased
renal excretion of bicarbonate and decreased renal excretion of hydrogen ions are not compensatory
mechanisms.
Question 3: A client with liver cirrhosis develops hepatic encephalopathy. Which substance is primarily
responsible for the neurological symptoms?
A) Ammonia
B) Bilirubin
C) Albumin
D) Globulin
,Answer: A) Ammonia
Rationale: Hepatic encephalopathy is caused by the accumulation of ammonia in the blood. The liver
normally converts ammonia to urea, which is excreted by the kidneys. In cirrhosis, the liver cannot
perform this function, leading to elevated ammonia levels. Ammonia crosses the blood-brain barrier and
causes neurological symptoms, including confusion, altered mental status, and coma.
Question 4: A client with type 1 diabetes develops diabetic ketoacidosis (DKA). Which metabolic change
leads to the development of ketoacidosis?
A) Increased fatty acid metabolism producing ketone bodies
B) Increased glucose metabolism producing lactic acid
C) Decreased fatty acid metabolism producing ketone bodies
D) Decreased glucose metabolism producing lactic acid
Answer: A) Increased fatty acid metabolism producing ketone bodies
Rationale: In DKA, the lack of insulin leads to increased fatty acid metabolism in the liver, producing
ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone). These ketone bodies are acids that
accumulate in the blood, causing metabolic acidosis. The nurse should monitor for signs of DKA,
including hyperglycemia, ketonuria, and Kussmaul respirations.
Question 5: A client with heart failure develops pulmonary edema. Which pathophysiological
mechanism is responsible for fluid accumulation in the lungs?
A) Increased left ventricular pressure transmitted to the pulmonary capillaries
B) Decreased left ventricular pressure transmitted to the pulmonary capillaries
C) Increased right ventricular pressure transmitted to the systemic circulation
D) Decreased right ventricular pressure transmitted to the systemic circulation
Answer: A) Increased left ventricular pressure transmitted to the pulmonary capillaries
Rationale: In heart failure, the left ventricle cannot pump blood effectively forward, leading to increased
left ventricular pressure. This pressure is transmitted backward to the left atrium, pulmonary veins, and
pulmonary capillaries, causing fluid to leak into the alveoli and resulting in pulmonary edema. The nurse
should monitor for signs of pulmonary edema, including dyspnea, crackles, and pink frothy sputum.
Question 6: A client with chronic obstructive pulmonary disease (COPD) develops cor pulmonale. Which
pathophysiological change leads to this complication?
A) Pulmonary hypertension causing right ventricular hypertrophy
B) Pulmonary hypotension causing right ventricular atrophy
C) Systemic hypertension causing left ventricular hypertrophy
D) Systemic hypotension causing left ventricular atrophy
,Answer: A) Pulmonary hypertension causing right ventricular hypertrophy
Rationale: Cor pulmonale is right-sided heart failure caused by pulmonary hypertension. In COPD, chronic
hypoxemia causes pulmonary vasoconstriction, leading to increased pulmonary vascular resistance and
pulmonary hypertension. The right ventricle must work harder to pump blood against this increased
resistance, leading to right ventricular hypertrophy and eventually failure.
Question 7: A client with acute pancreatitis develops hypocalcemia. Which pathophysiological
mechanism is responsible?
A) Binding of calcium to fatty acids in necrotic fat tissue (saponification)
B) Decreased production of parathyroid hormone (PTH)
C) Increased renal excretion of calcium
D) Decreased dietary intake of calcium
Answer: A) Binding of calcium to fatty acids in necrotic fat tissue (saponification)
Rationale: In acute pancreatitis, necrotic fat tissue releases fatty acids, which bind to calcium ions,
forming calcium soaps (saponification). This reduces ionized calcium in the blood, causing hypocalcemia.
The nurse should monitor for signs of hypocalcemia, including muscle twitching, tetany, and Chvostek's
sign.
Question 8: A client with sepsis develops disseminated intravascular coagulation (DIC). Which
pathophysiological mechanism is responsible for the bleeding and clotting?
A) Excessive activation of the coagulation cascade leading to consumption of clotting factors and
platelets
B) Decreased activation of the coagulation cascade leading to increased clotting factors and platelets
C) Excessive activation of the fibrinolytic system leading to decreased clotting factors
D) Decreased activation of the fibrinolytic system leading to increased clotting factors
Answer: A) Excessive activation of the coagulation cascade leading to consumption of clotting factors
and platelets
Rationale: DIC is characterized by widespread activation of the coagulation cascade, leading to the
formation of microvascular thrombi. This consumes clotting factors and platelets, leading to bleeding.
Sepsis triggers the release of inflammatory cytokines that activate the coagulation system. The nurse
should monitor for signs of bleeding, thrombosis, and organ dysfunction.
Question 9: A client with chronic kidney disease develops hyperphosphatemia. Which
pathophysiological mechanism is responsible?
A) Decreased renal excretion of phosphate
B) Increased renal excretion of phosphate
, C) Decreased dietary intake of phosphate
D) Increased parathyroid hormone (PTH) levels
Answer: A) Decreased renal excretion of phosphate
Rationale: In chronic kidney disease, the kidneys cannot excrete phosphate effectively, leading to
hyperphosphatemia. Decreased renal excretion is the primary mechanism. Increased renal excretion and
decreased dietary intake would lead to hypophosphatemia. Increased PTH levels are a response to
hyperphosphatemia and hypocalcemia, not the cause.
Question 10: A client with asthma experiences an acute exacerbation. Which pathophysiological change
occurs during an asthma attack?
A) Bronchoconstriction, inflammation, and mucus production
B) Bronchodilation and decreased airway resistance
C) Alveolar collapse and decreased lung compliance
D) Destruction of alveolar walls and decreased elastic recoil
Answer: A) Bronchoconstriction, inflammation, and mucus production
Rationale: An asthma exacerbation is characterized by bronchoconstriction, airway inflammation, and
increased mucus production. These changes narrow the airways, increase airway resistance, and make
breathing difficult. Bronchodilation would improve symptoms. Alveolar collapse and destruction of
alveolar walls are characteristic of other respiratory conditions.
Question 11: A client with type 2 diabetes develops peripheral neuropathy. Which pathophysiological
mechanism is responsible?
A) Microvascular damage causing ischemia to peripheral nerves
B) Direct toxic effect of glucose on nerve cells
C) Immune-mediated destruction of nerve cells
D) Vitamin B12 deficiency due to diabetic diet
Answer: A) Microvascular damage causing ischemia to peripheral nerves
Rationale: Diabetic peripheral neuropathy is caused by microvascular damage leading to ischemia of the
peripheral nerves. Hyperglycemia damages small blood vessels that supply the nerves, leading to
impaired nerve function. The nurse should assess for signs of neuropathy, including numbness, tingling,
and pain in the extremities, and provide education on foot care to prevent complications.
Question 12: A client with heart failure develops atrial fibrillation. Which pathophysiological mechanism
is responsible for this arrhythmia?
A) Atrial stretch causing electrical instability
B) Decreased cardiac output causing ischemia of the conduction system
