NSG 530 Final Exam Actual Exam V2 | NSG 530 Advanced
Pathophysiology (NSG530 Final Exam) [PDF] | Wilkes University
1. A 68-year-old male with a history of heart failure presents with worsening dyspnea and
orthopnea. Physical examination reveals bilateral pulmonary crackles and peripheral edema.
Which compensatory mechanism is primarily responsible for the long-term maladaptive
remodeling of the myocardium in this patient?
A. Acute activation of the parasympathetic nervous system
B. Decreased production of endothelin-1
C. Increased secretion of atrial natriuretic peptide (ANP)
D. Chronic activation of the renin-angiotensin-aldosterone system (RAAS)
Answer: D
Rationale: The RAAS system is activated in response to decreased renal perfusion
commonly seen in heart failure. Chronic exposure to Angiotensin II and Aldosterone leads
to myocyte hypertrophy and interstitial fibrosis. This remodeling eventually decreases
cardiac compliance and worsens systolic and diastolic function.
2. A patient in the intensive care unit develops Acute Respiratory Distress Syndrome (ARDS).
The nurse practitioner notes a significant decrease in the PaO2 despite increasing the FiO2 to
80%. This clinical phenomenon is best explained by which pathophysiologic process?
A. Increased dead space ventilation
B. Hypoventilation due to sedation
C. Right-to-left intrapulmonary shunting
D. Increased diffusion capacity
Answer: C
Rationale: In ARDS, alveoli fill with fluid and proteinaceous material, preventing gas
exchange even when oxygen concentrations are high. Blood flows through these non-
ventilated areas without being oxygenated, a process known as shunting. This results in
refractory hypoxemia which is a hallmark of severe lung injury.
3. A 45-year-old female presents with a serum sodium level of 122 mEq/L and a low serum
osmolality. Further testing reveals high urine osmolality and high urine sodium. What is the
most likely underlying mechanism for this electrolyte imbalance?
A. Diabetes Insipidus
B. Deficiency of Aldosterone
,C. Excessive release of Antidiuretic Hormone (ADH)
D. Psychogenic polydipsia
Answer: C
Rationale: The Syndrome of Inappropriate Antidiuretic Hormone (SIADH) results in the
excessive reabsorption of water by the kidneys. This leads to dilutional hyponatremia and a
concentrated urine despite low serum osmolality. It is often associated with malignancies,
pulmonary disorders, or central nervous system injuries.
4. A patient with chronic kidney disease (CKD) presents with a serum potassium of 6.5 mEq/L
and peaked T-waves on EKG. Which process contributes most significantly to hyperkalemia in
advanced renal failure?
A. Reduced glomerular filtration and tubular secretion of potassium
B. Increased renal tubular secretion of potassium
C. Systemic metabolic alkalosis
D. Activation of the sodium-potassium ATPase pump
Answer: A
Rationale: As glomerular filtration rate (GFR) declines in CKD, the kidneys lose the ability
to effectively excrete potassium. Additionally, the decrease in distal tubule flow and
reduced responsiveness to aldosterone further impair potassium secretion. This
accumulation can lead to life-threatening cardiac arrhythmias if not addressed.
5. A 55-year-old male is evaluated for a possible ischemic stroke. Pathophysiologically, the
‘penumbra’ refers to which of the following?
A. Ischemic tissue that is potentially salvageable with timely reperfusion
B. The area of brain tissue that is hyperperfused
C. The core area of irreversible neuronal necrosis
D. The site where the cerebral artery is completely occluded
Answer: A
Rationale: The penumbra is the zone of hypoperfused tissue surrounding the central core
of an infarction. While blood flow is reduced, it is sufficient to maintain cellular integrity for
a limited time. Rapid intervention aims to restore flow to this area to prevent further
neuronal death.
6. In a patient with Type 1 Diabetes Mellitus experiencing Diabetic Ketoacidosis (DKA), which
metabolic abnormality is the primary driver of ketone body production?
A. Excessive insulin levels leading to glucose storage
, B. Glucagon deficiency inhibiting lipolysis
C. Insulin deficiency and increased counter-regulatory hormones
D. Reduced levels of free fatty acids in the blood
Answer: C
Rationale: Absolute insulin deficiency prevents glucose from entering cells, shifting the
body toward fat metabolism. Counter-regulatory hormones like glucagon and cortisol
stimulate the breakdown of adipose tissue into free fatty acids. These fatty acids travel to
the liver where they are converted into acidic ketone bodies, leading to metabolic acidosis.
7. A 30-year-old female presents with weight loss, heat intolerance, and exophthalmos. Labs
show a suppressed TSH and elevated free T4. What is the primary immunologic mechanism of
this disease?
A. Autoantibodies that stimulate the TSH receptor
B. Destruction of the thyroid gland by T-cells
C. Antibodies that block iodine uptake
D. Hypersecretion of TSH by the pituitary gland
Answer: A
Rationale: Graves’ disease is characterized by the production of thyroid-stimulating
immunoglobulins (TSI). These autoantibodies bind to and activate the TSH receptors on
thyroid follicular cells, bypassing the normal feedback loop. This results in the
overproduction of thyroid hormones and the classic symptoms of hyperthyroidism.
8. A patient with cirrhosis develops significant ascites. Which factor is the primary driver of
fluid accumulation in the peritoneal cavity?
A. Increased plasma oncotic pressure
B. Decreased portal venous pressure
C. Inhibition of the renin-angiotensin-aldosterone system
D. Decreased serum albumin levels and portal hypertension
Answer: D
Rationale: Cirrhosis leads to scarring of the liver, which increases resistance to blood flow
in the portal vein, causing portal hypertension. Simultaneously, the damaged liver produces
less albumin, leading to decreased plasma oncotic pressure. These two factors, combined
with renal sodium retention, facilitate the leakage of fluid into the abdominal cavity.
Pathophysiology (NSG530 Final Exam) [PDF] | Wilkes University
1. A 68-year-old male with a history of heart failure presents with worsening dyspnea and
orthopnea. Physical examination reveals bilateral pulmonary crackles and peripheral edema.
Which compensatory mechanism is primarily responsible for the long-term maladaptive
remodeling of the myocardium in this patient?
A. Acute activation of the parasympathetic nervous system
B. Decreased production of endothelin-1
C. Increased secretion of atrial natriuretic peptide (ANP)
D. Chronic activation of the renin-angiotensin-aldosterone system (RAAS)
Answer: D
Rationale: The RAAS system is activated in response to decreased renal perfusion
commonly seen in heart failure. Chronic exposure to Angiotensin II and Aldosterone leads
to myocyte hypertrophy and interstitial fibrosis. This remodeling eventually decreases
cardiac compliance and worsens systolic and diastolic function.
2. A patient in the intensive care unit develops Acute Respiratory Distress Syndrome (ARDS).
The nurse practitioner notes a significant decrease in the PaO2 despite increasing the FiO2 to
80%. This clinical phenomenon is best explained by which pathophysiologic process?
A. Increased dead space ventilation
B. Hypoventilation due to sedation
C. Right-to-left intrapulmonary shunting
D. Increased diffusion capacity
Answer: C
Rationale: In ARDS, alveoli fill with fluid and proteinaceous material, preventing gas
exchange even when oxygen concentrations are high. Blood flows through these non-
ventilated areas without being oxygenated, a process known as shunting. This results in
refractory hypoxemia which is a hallmark of severe lung injury.
3. A 45-year-old female presents with a serum sodium level of 122 mEq/L and a low serum
osmolality. Further testing reveals high urine osmolality and high urine sodium. What is the
most likely underlying mechanism for this electrolyte imbalance?
A. Diabetes Insipidus
B. Deficiency of Aldosterone
,C. Excessive release of Antidiuretic Hormone (ADH)
D. Psychogenic polydipsia
Answer: C
Rationale: The Syndrome of Inappropriate Antidiuretic Hormone (SIADH) results in the
excessive reabsorption of water by the kidneys. This leads to dilutional hyponatremia and a
concentrated urine despite low serum osmolality. It is often associated with malignancies,
pulmonary disorders, or central nervous system injuries.
4. A patient with chronic kidney disease (CKD) presents with a serum potassium of 6.5 mEq/L
and peaked T-waves on EKG. Which process contributes most significantly to hyperkalemia in
advanced renal failure?
A. Reduced glomerular filtration and tubular secretion of potassium
B. Increased renal tubular secretion of potassium
C. Systemic metabolic alkalosis
D. Activation of the sodium-potassium ATPase pump
Answer: A
Rationale: As glomerular filtration rate (GFR) declines in CKD, the kidneys lose the ability
to effectively excrete potassium. Additionally, the decrease in distal tubule flow and
reduced responsiveness to aldosterone further impair potassium secretion. This
accumulation can lead to life-threatening cardiac arrhythmias if not addressed.
5. A 55-year-old male is evaluated for a possible ischemic stroke. Pathophysiologically, the
‘penumbra’ refers to which of the following?
A. Ischemic tissue that is potentially salvageable with timely reperfusion
B. The area of brain tissue that is hyperperfused
C. The core area of irreversible neuronal necrosis
D. The site where the cerebral artery is completely occluded
Answer: A
Rationale: The penumbra is the zone of hypoperfused tissue surrounding the central core
of an infarction. While blood flow is reduced, it is sufficient to maintain cellular integrity for
a limited time. Rapid intervention aims to restore flow to this area to prevent further
neuronal death.
6. In a patient with Type 1 Diabetes Mellitus experiencing Diabetic Ketoacidosis (DKA), which
metabolic abnormality is the primary driver of ketone body production?
A. Excessive insulin levels leading to glucose storage
, B. Glucagon deficiency inhibiting lipolysis
C. Insulin deficiency and increased counter-regulatory hormones
D. Reduced levels of free fatty acids in the blood
Answer: C
Rationale: Absolute insulin deficiency prevents glucose from entering cells, shifting the
body toward fat metabolism. Counter-regulatory hormones like glucagon and cortisol
stimulate the breakdown of adipose tissue into free fatty acids. These fatty acids travel to
the liver where they are converted into acidic ketone bodies, leading to metabolic acidosis.
7. A 30-year-old female presents with weight loss, heat intolerance, and exophthalmos. Labs
show a suppressed TSH and elevated free T4. What is the primary immunologic mechanism of
this disease?
A. Autoantibodies that stimulate the TSH receptor
B. Destruction of the thyroid gland by T-cells
C. Antibodies that block iodine uptake
D. Hypersecretion of TSH by the pituitary gland
Answer: A
Rationale: Graves’ disease is characterized by the production of thyroid-stimulating
immunoglobulins (TSI). These autoantibodies bind to and activate the TSH receptors on
thyroid follicular cells, bypassing the normal feedback loop. This results in the
overproduction of thyroid hormones and the classic symptoms of hyperthyroidism.
8. A patient with cirrhosis develops significant ascites. Which factor is the primary driver of
fluid accumulation in the peritoneal cavity?
A. Increased plasma oncotic pressure
B. Decreased portal venous pressure
C. Inhibition of the renin-angiotensin-aldosterone system
D. Decreased serum albumin levels and portal hypertension
Answer: D
Rationale: Cirrhosis leads to scarring of the liver, which increases resistance to blood flow
in the portal vein, causing portal hypertension. Simultaneously, the damaged liver produces
less albumin, leading to decreased plasma oncotic pressure. These two factors, combined
with renal sodium retention, facilitate the leakage of fluid into the abdominal cavity.
