NSG 530 Final Exam Actual Exam V3 | NSG 530 Advanced
Pathophysiology (NSG530 Final Exam) [PDF] | Wilkes University
1. A 68-year-old male with a history of myocardial infarction undergoes a procedure to
restore blood flow to the ischemic myocardium. Shortly after, he experiences further tissue
damage. Which mechanism primarily drives this reperfusion injury?
A. Immediate restoration of normal ATP levels
B. Rapid intracellular accumulation of potassium ions
C. Decreased calcium influx into the mitochondria
D. Excessive production of reactive oxygen species (ROS)
Answer: D
Rationale: Reperfusion injury occurs when oxygen is reintroduced to ischemic tissues,
leading to the formation of reactive oxygen species. These free radicals damage cell
membranes through lipid peroxidation and trigger the opening of the mitochondrial
permeability transition pore. This process significantly exacerbates the initial injury caused
by the hypoxic state.
2. A 35-year-old female presents with fatigue and cold intolerance. Laboratory results show
high TSH and low free T4 levels. Which pathophysiological mechanism most likely accounts
for these findings?
A. Autoimmune destruction of thyroid follicles by T-cells and antibodies
B. Autonomous production of thyroid hormones by a nodule
C. Pituitary resistance to negative feedback by thyroid hormones
D. Excessive stimulation of TSH receptors by IgG antibodies
Answer: A
Rationale: The clinical picture describes Hashimoto’s thyroiditis, the most common cause
of primary hypothyroidism. It involves an autoimmune process where lymphocytes
infiltrate the thyroid, leading to follicle destruction. Consequently, low T4 levels fail to
inhibit the pituitary, resulting in compensatory elevations of TSH.
3. During a clinical evaluation, a 45-year-old patient with chronic kidney disease presents
with itchy skin and muscle cramps. Lab work reveals hypocalcemia and hyperphosphatemia.
What is the underlying cause of the secondary hyperparathyroidism in this patient?
A. Excessive intestinal absorption of calcium due to high vitamin D
B. Primary adenoma of the parathyroid gland
,C. Suppression of PTH secretion by elevated phosphorus levels
D. Decreased renal excretion of phosphate and impaired Vitamin D activation
Answer: D
Rationale: In chronic kidney disease, the kidneys fail to excrete phosphate, leading to
hyperphosphatemia. Furthermore, the loss of renal mass decreases the conversion of
Vitamin D to its active form, calcitriol. The resulting low serum calcium stimulates the
parathyroid glands to chronically oversecrete PTH, attempting to normalize calcium levels
at the expense of bone health.
4. A 22-year-old male presents with sudden onset shortness of breath and pleuritic chest
pain. A chest X-ray confirms a spontaneous pneumothorax. Which statement best describes
the pathophysiology of the lung collapse?
A. Equality between atmospheric pressure and intrapleural pressure
B. Increased negative pressure in the pleural space
C. Excessive surfactant production causing alveolar closure
D. Accumulation of transudative fluid in the pleural cavity
Answer: A
Rationale: A pneumothorax occurs when air enters the pleural space, which is normally
maintained at a negative pressure relative to the atmosphere. When a breach occurs, air
flows in until the intrapleural pressure equals atmospheric pressure. This loss of negative
pressure removes the force that keeps the lung expanded, resulting in elastic recoil and
collapse.
5. A 55-year-old patient with a long history of uncontrolled hypertension presents with signs
of left heart failure. An echocardiogram shows a thickened left ventricular wall. What cellular
process is responsible for this change?
A. Hyperplasia of myocardial cells
B. Metaplasia of the endocardium
C. Hypertrophy of cardiomyocytes
D. Dysplasia of the sarcomeres
Answer: C
Rationale: Cardiac muscle cells are permanent cells and do not undergo mitosis; therefore,
they cannot undergo hyperplasia. In response to the increased afterload of hypertension,
the cells increase in size and protein content to handle the work. This pathological
hypertrophy eventually leads to decreased compliance and heart failure.
, 6. A patient presents with widespread small hemorrhages, oozing from IV sites, and multi-
organ failure. Laboratory tests show prolonged PT/PTT and very low fibrinogen. What is the
primary triggering event in Disseminated Intravascular Coagulation (DIC)?
A. Isolated deficiency of Factor VIII
B. Systemic release of tissue factor into the circulation
C. Excessive production of Vitamin K in the liver
D. Inhibition of the fibrinolytic pathway
Answer: B
Rationale: DIC is characterized by the systemic activation of the coagulation cascade,
usually triggered by the massive release of tissue factor. This leads to widespread
microvascular thrombosis, which consumes clotting factors and platelets. Subsequent
activation of fibrinolysis leads to the degradation of clots and severe bleeding.
7. A 60-year-old smoker presents with a chronic cough and productive sputum for the past
three years. Pulmonary function tests show a decreased FEV1/FVC ratio. What is the hallmark
of chronic bronchitis pathophysiology?
A. Hypertrophy of mucus-secreting glands in the large airways
B. Destruction of the alveolar walls and loss of elastic recoil
C. Reversible bronchospasm triggered by allergens
D. Genetic deficiency of alpha-1 antitrypsin
Answer: A
Rationale: Chronic bronchitis is defined clinically by a productive cough lasting at least 3
months for 2 consecutive years. The underlying pathology involves the hypertrophy of
bronchial mucous glands and an increase in goblet cells, leading to excessive mucus
production. This differs from emphysema, which primarily involves the destruction of the
distal airspaces.
8. A child presents with a high fever, severe headache, and a positive Brudzinski sign. Lumbar
puncture shows high protein, low glucose, and many neutrophils. Which organism is the most
likely culprit for this inflammatory response?
A. Neisseria meningitidis
B. Enterovirus
C. Cryptococcus neoformans
D. Mycobacterium tuberculosis
Answer: A
Pathophysiology (NSG530 Final Exam) [PDF] | Wilkes University
1. A 68-year-old male with a history of myocardial infarction undergoes a procedure to
restore blood flow to the ischemic myocardium. Shortly after, he experiences further tissue
damage. Which mechanism primarily drives this reperfusion injury?
A. Immediate restoration of normal ATP levels
B. Rapid intracellular accumulation of potassium ions
C. Decreased calcium influx into the mitochondria
D. Excessive production of reactive oxygen species (ROS)
Answer: D
Rationale: Reperfusion injury occurs when oxygen is reintroduced to ischemic tissues,
leading to the formation of reactive oxygen species. These free radicals damage cell
membranes through lipid peroxidation and trigger the opening of the mitochondrial
permeability transition pore. This process significantly exacerbates the initial injury caused
by the hypoxic state.
2. A 35-year-old female presents with fatigue and cold intolerance. Laboratory results show
high TSH and low free T4 levels. Which pathophysiological mechanism most likely accounts
for these findings?
A. Autoimmune destruction of thyroid follicles by T-cells and antibodies
B. Autonomous production of thyroid hormones by a nodule
C. Pituitary resistance to negative feedback by thyroid hormones
D. Excessive stimulation of TSH receptors by IgG antibodies
Answer: A
Rationale: The clinical picture describes Hashimoto’s thyroiditis, the most common cause
of primary hypothyroidism. It involves an autoimmune process where lymphocytes
infiltrate the thyroid, leading to follicle destruction. Consequently, low T4 levels fail to
inhibit the pituitary, resulting in compensatory elevations of TSH.
3. During a clinical evaluation, a 45-year-old patient with chronic kidney disease presents
with itchy skin and muscle cramps. Lab work reveals hypocalcemia and hyperphosphatemia.
What is the underlying cause of the secondary hyperparathyroidism in this patient?
A. Excessive intestinal absorption of calcium due to high vitamin D
B. Primary adenoma of the parathyroid gland
,C. Suppression of PTH secretion by elevated phosphorus levels
D. Decreased renal excretion of phosphate and impaired Vitamin D activation
Answer: D
Rationale: In chronic kidney disease, the kidneys fail to excrete phosphate, leading to
hyperphosphatemia. Furthermore, the loss of renal mass decreases the conversion of
Vitamin D to its active form, calcitriol. The resulting low serum calcium stimulates the
parathyroid glands to chronically oversecrete PTH, attempting to normalize calcium levels
at the expense of bone health.
4. A 22-year-old male presents with sudden onset shortness of breath and pleuritic chest
pain. A chest X-ray confirms a spontaneous pneumothorax. Which statement best describes
the pathophysiology of the lung collapse?
A. Equality between atmospheric pressure and intrapleural pressure
B. Increased negative pressure in the pleural space
C. Excessive surfactant production causing alveolar closure
D. Accumulation of transudative fluid in the pleural cavity
Answer: A
Rationale: A pneumothorax occurs when air enters the pleural space, which is normally
maintained at a negative pressure relative to the atmosphere. When a breach occurs, air
flows in until the intrapleural pressure equals atmospheric pressure. This loss of negative
pressure removes the force that keeps the lung expanded, resulting in elastic recoil and
collapse.
5. A 55-year-old patient with a long history of uncontrolled hypertension presents with signs
of left heart failure. An echocardiogram shows a thickened left ventricular wall. What cellular
process is responsible for this change?
A. Hyperplasia of myocardial cells
B. Metaplasia of the endocardium
C. Hypertrophy of cardiomyocytes
D. Dysplasia of the sarcomeres
Answer: C
Rationale: Cardiac muscle cells are permanent cells and do not undergo mitosis; therefore,
they cannot undergo hyperplasia. In response to the increased afterload of hypertension,
the cells increase in size and protein content to handle the work. This pathological
hypertrophy eventually leads to decreased compliance and heart failure.
, 6. A patient presents with widespread small hemorrhages, oozing from IV sites, and multi-
organ failure. Laboratory tests show prolonged PT/PTT and very low fibrinogen. What is the
primary triggering event in Disseminated Intravascular Coagulation (DIC)?
A. Isolated deficiency of Factor VIII
B. Systemic release of tissue factor into the circulation
C. Excessive production of Vitamin K in the liver
D. Inhibition of the fibrinolytic pathway
Answer: B
Rationale: DIC is characterized by the systemic activation of the coagulation cascade,
usually triggered by the massive release of tissue factor. This leads to widespread
microvascular thrombosis, which consumes clotting factors and platelets. Subsequent
activation of fibrinolysis leads to the degradation of clots and severe bleeding.
7. A 60-year-old smoker presents with a chronic cough and productive sputum for the past
three years. Pulmonary function tests show a decreased FEV1/FVC ratio. What is the hallmark
of chronic bronchitis pathophysiology?
A. Hypertrophy of mucus-secreting glands in the large airways
B. Destruction of the alveolar walls and loss of elastic recoil
C. Reversible bronchospasm triggered by allergens
D. Genetic deficiency of alpha-1 antitrypsin
Answer: A
Rationale: Chronic bronchitis is defined clinically by a productive cough lasting at least 3
months for 2 consecutive years. The underlying pathology involves the hypertrophy of
bronchial mucous glands and an increase in goblet cells, leading to excessive mucus
production. This differs from emphysema, which primarily involves the destruction of the
distal airspaces.
8. A child presents with a high fever, severe headache, and a positive Brudzinski sign. Lumbar
puncture shows high protein, low glucose, and many neutrophils. Which organism is the most
likely culprit for this inflammatory response?
A. Neisseria meningitidis
B. Enterovirus
C. Cryptococcus neoformans
D. Mycobacterium tuberculosis
Answer: A
