NSG 530 Exam 2 Actual Exam V3 | NSG 530 Advanced
Pathophysiology (NSG530 Exam 2) | Wilkes University
1. A patient with Chronic Kidney Disease (CKD) presents with secondary
hyperparathyroidism. Which pathophysiological sequence best explains this phenomenon?
A. Decreased vitamin D activation leads to hypocalcemia, stimulating the parathyroid
gland.
B. Increased renal excretion of phosphate causes a feedback loop to the thyroid gland.
C. Excessive magnesium retention inhibits the calcium-sensing receptors.
D. Hypernatremia directly triggers the release of parathyroid hormone to manage volume.
Answer: A
Rationale: In CKD, the kidneys fail to activate vitamin D (calcitriol), which is essential for
intestinal calcium absorption. The resulting hypocalcemia triggers the parathyroid glands
to overproduce PTH in an attempt to normalize serum calcium levels. Additionally,
phosphate retention in CKD further lowers serum calcium, compounding the stimulus for
parathyroid hyperplasia.
2. Which mechanism is primarily responsible for the development of ascites in a patient with
end-stage liver cirrhosis?
A. Increased capillary oncotic pressure within the portal vein.
B. Decreased lymphatic drainage from the peritoneal cavity.
C. Portal hypertension and decreased synthesis of serum albumin.
D. Increased systemic vascular resistance causing fluid shift.
Answer: C
Rationale: Cirrhosis leads to portal hypertension, which increases hydrostatic pressure in
the peritoneal capillaries. Simultaneously, the failing liver cannot synthesize sufficient
albumin, leading to decreased plasma oncotic pressure. These two forces combine to drive
fluid out of the vascular space and into the third space of the peritoneal cavity.
3. A 55-year-old male is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone
(SIADH). What is the primary electrolyte disturbance observed, and what is its underlying
cause?
A. Hypernatremia due to excessive sodium intake.
B. Hyponatremia due to dilutional effects of water retention.
C. Hypokalemia resulting from renal tubular acidosis.
,D. Hypercalcemia from bone resorption driven by ADH.
Answer: B
Rationale: SIADH involves the excessive release of ADH, which causes the kidneys to
reabsorb water despite normal or low plasma osmolality. This excess water retention
expands the extracellular fluid volume, leading to a dilutional hyponatremia. The body
attempts to compensate by excreting sodium in the urine, further lowering serum sodium
levels while maintaining a euvolemic state.
4. In the pathophysiology of Diabetic Ketoacidosis (DKA), which hormone deficiency is the
primary driver of metabolic acidosis?
A. Insulin
B. Cortisol
C. Glucagon
D. Aldosterone
Answer: A
Rationale: Insulin deficiency prevents glucose from entering cells, leading the body to
switch to fat metabolism for energy. This process results in the production of ketones
(acetoacetate and beta-hydroxybutyrate), which are acidic. The accumulation of these
ketoacids exceeds the body’s buffering capacity, resulting in a widened anion gap metabolic
acidosis.
5. A patient experiences a transient ischemic attack (TIA). What distinguishes the
pathophysiology of a TIA from that of an ischemic stroke?
A. The ischemic event in a TIA is brief and does not cause permanent infarction.
B. TIAs involve hemorrhagic transformations that resolve quickly.
C. TIAs are caused by venous rather than arterial occlusion.
D. Ischemic strokes always involve the circle of Willis, whereas TIAs do not.
Answer: A
Rationale: A TIA is characterized by a temporary blockage of blood flow to the brain that
resolves before permanent tissue death (infarction) occurs. By definition, clinical
symptoms resolve within 24 hours, though most resolve in less than an hour. In contrast,
an ischemic stroke results in permanent neuronal death due to prolonged oxygen and
nutrient deprivation.
6. Which pathophysiological process occurs in the early stages of Acute Respiratory Distress
Syndrome (ARDS)?
A. Endothelial damage leading to increased alveolar-capillary permeability.
, B. Increased compliance of the lung tissue due to surfactant overproduction.
C. Bronchoconstriction caused by parasympathetic overactivity.
D. Decreased pulmonary artery pressure due to vasodilation.
Answer: A
Rationale: The early or exudative phase of ARDS is characterized by damage to the
alveolar-capillary membrane. This injury allows protein-rich fluid to leak into the alveoli,
leading to pulmonary edema and impaired gas exchange. This inflammatory response also
inactivates surfactant, further contributing to alveolar collapse and severe hypoxia.
7. What is the primary pathophysiological defect in Myasthenia Gravis?
A. Autoimmune destruction of acetylcholine receptors at the neuromuscular junction.
B. Destruction of the anterior horn cells in the spinal cord.
C. Demyelination of the peripheral nerves.
D. Excessive release of dopamine in the basal ganglia.
Answer: A
Rationale: Myasthenia Gravis is an autoimmune disorder where antibodies (typically IgG)
attack and destroy nicotinic acetylcholine receptors at the postsynaptic neuromuscular
junction. This reduction in available receptors prevents effective muscle depolarization
despite adequate acetylcholine release. The clinical hallmark is fluctuating muscle
weakness that worsens with repetitive use.
8. Which of the following describes the ‘ischemic penumbra’ in the context of an acute
stroke?
A. The area of the brain that has already undergone irreversible necrosis.
B. A region of viable but functionally impaired tissue surrounding the necrotic core.
C. The site of the initial arterial rupture in a hemorrhagic stroke.
D. The collateral circulation that prevents any damage from occurring.
Answer: B
Rationale: The ischemic penumbra refers to the zone of tissue surrounding the central
core of an infarction. While blood flow to the penumbra is reduced, it remains sufficient to
maintain cellular integrity for a short period. Rapid reperfusion strategies aim to save this
tissue before it progresses to irreversible injury and joins the necrotic core.
9. How does the body compensate for the metabolic acidosis found in patients with stage 4
Chronic Kidney Disease?
A. Decreasing the respiratory rate to retain carbon dioxide.
Pathophysiology (NSG530 Exam 2) | Wilkes University
1. A patient with Chronic Kidney Disease (CKD) presents with secondary
hyperparathyroidism. Which pathophysiological sequence best explains this phenomenon?
A. Decreased vitamin D activation leads to hypocalcemia, stimulating the parathyroid
gland.
B. Increased renal excretion of phosphate causes a feedback loop to the thyroid gland.
C. Excessive magnesium retention inhibits the calcium-sensing receptors.
D. Hypernatremia directly triggers the release of parathyroid hormone to manage volume.
Answer: A
Rationale: In CKD, the kidneys fail to activate vitamin D (calcitriol), which is essential for
intestinal calcium absorption. The resulting hypocalcemia triggers the parathyroid glands
to overproduce PTH in an attempt to normalize serum calcium levels. Additionally,
phosphate retention in CKD further lowers serum calcium, compounding the stimulus for
parathyroid hyperplasia.
2. Which mechanism is primarily responsible for the development of ascites in a patient with
end-stage liver cirrhosis?
A. Increased capillary oncotic pressure within the portal vein.
B. Decreased lymphatic drainage from the peritoneal cavity.
C. Portal hypertension and decreased synthesis of serum albumin.
D. Increased systemic vascular resistance causing fluid shift.
Answer: C
Rationale: Cirrhosis leads to portal hypertension, which increases hydrostatic pressure in
the peritoneal capillaries. Simultaneously, the failing liver cannot synthesize sufficient
albumin, leading to decreased plasma oncotic pressure. These two forces combine to drive
fluid out of the vascular space and into the third space of the peritoneal cavity.
3. A 55-year-old male is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone
(SIADH). What is the primary electrolyte disturbance observed, and what is its underlying
cause?
A. Hypernatremia due to excessive sodium intake.
B. Hyponatremia due to dilutional effects of water retention.
C. Hypokalemia resulting from renal tubular acidosis.
,D. Hypercalcemia from bone resorption driven by ADH.
Answer: B
Rationale: SIADH involves the excessive release of ADH, which causes the kidneys to
reabsorb water despite normal or low plasma osmolality. This excess water retention
expands the extracellular fluid volume, leading to a dilutional hyponatremia. The body
attempts to compensate by excreting sodium in the urine, further lowering serum sodium
levels while maintaining a euvolemic state.
4. In the pathophysiology of Diabetic Ketoacidosis (DKA), which hormone deficiency is the
primary driver of metabolic acidosis?
A. Insulin
B. Cortisol
C. Glucagon
D. Aldosterone
Answer: A
Rationale: Insulin deficiency prevents glucose from entering cells, leading the body to
switch to fat metabolism for energy. This process results in the production of ketones
(acetoacetate and beta-hydroxybutyrate), which are acidic. The accumulation of these
ketoacids exceeds the body’s buffering capacity, resulting in a widened anion gap metabolic
acidosis.
5. A patient experiences a transient ischemic attack (TIA). What distinguishes the
pathophysiology of a TIA from that of an ischemic stroke?
A. The ischemic event in a TIA is brief and does not cause permanent infarction.
B. TIAs involve hemorrhagic transformations that resolve quickly.
C. TIAs are caused by venous rather than arterial occlusion.
D. Ischemic strokes always involve the circle of Willis, whereas TIAs do not.
Answer: A
Rationale: A TIA is characterized by a temporary blockage of blood flow to the brain that
resolves before permanent tissue death (infarction) occurs. By definition, clinical
symptoms resolve within 24 hours, though most resolve in less than an hour. In contrast,
an ischemic stroke results in permanent neuronal death due to prolonged oxygen and
nutrient deprivation.
6. Which pathophysiological process occurs in the early stages of Acute Respiratory Distress
Syndrome (ARDS)?
A. Endothelial damage leading to increased alveolar-capillary permeability.
, B. Increased compliance of the lung tissue due to surfactant overproduction.
C. Bronchoconstriction caused by parasympathetic overactivity.
D. Decreased pulmonary artery pressure due to vasodilation.
Answer: A
Rationale: The early or exudative phase of ARDS is characterized by damage to the
alveolar-capillary membrane. This injury allows protein-rich fluid to leak into the alveoli,
leading to pulmonary edema and impaired gas exchange. This inflammatory response also
inactivates surfactant, further contributing to alveolar collapse and severe hypoxia.
7. What is the primary pathophysiological defect in Myasthenia Gravis?
A. Autoimmune destruction of acetylcholine receptors at the neuromuscular junction.
B. Destruction of the anterior horn cells in the spinal cord.
C. Demyelination of the peripheral nerves.
D. Excessive release of dopamine in the basal ganglia.
Answer: A
Rationale: Myasthenia Gravis is an autoimmune disorder where antibodies (typically IgG)
attack and destroy nicotinic acetylcholine receptors at the postsynaptic neuromuscular
junction. This reduction in available receptors prevents effective muscle depolarization
despite adequate acetylcholine release. The clinical hallmark is fluctuating muscle
weakness that worsens with repetitive use.
8. Which of the following describes the ‘ischemic penumbra’ in the context of an acute
stroke?
A. The area of the brain that has already undergone irreversible necrosis.
B. A region of viable but functionally impaired tissue surrounding the necrotic core.
C. The site of the initial arterial rupture in a hemorrhagic stroke.
D. The collateral circulation that prevents any damage from occurring.
Answer: B
Rationale: The ischemic penumbra refers to the zone of tissue surrounding the central
core of an infarction. While blood flow to the penumbra is reduced, it remains sufficient to
maintain cellular integrity for a short period. Rapid reperfusion strategies aim to save this
tissue before it progresses to irreversible injury and joins the necrotic core.
9. How does the body compensate for the metabolic acidosis found in patients with stage 4
Chronic Kidney Disease?
A. Decreasing the respiratory rate to retain carbon dioxide.
