NUR 546/NUR546 Exam 3 V3 | Advanced
Pathophysiology Q&A with Rationale |
William Paterson University
1. A 10-year-old child is diagnosed with Type 1 Diabetes Mellitus. What is the primary
pathophysiology behind this condition?
A. Insulin resistance in peripheral tissues
B. Hypersecretion of glucagon by alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Excessive dietary intake of simple sugars
Answer: C
Rationale: Type 1 Diabetes Mellitus involves an autoimmune-mediated destruction of the
insulin-producing beta cells in the pancreas. This process leads to an absolute deficiency of
insulin, making the patient dependent on exogenous insulin for survival. Without insulin,
glucose cannot enter the cells for energy, leading to systemic hyperglycemia and metabolic
disturbances.
2. Which clinical manifestation is most characteristic of Myxedema coma?
A. Hyperthermia and tachycardia
B. Rapid speech and hyper-reflexia
C. Hypotension and hypoventilation
,D. Diarrhea and weight loss
Answer: C
Rationale: Myxedema coma is a life-threatening complication of severe, untreated
hypothyroidism. It is characterized by extreme lethargy, hypothermia, and respiratory
depression leading to hypoventilation. Management requires immediate intravenous
thyroid hormone replacement and intensive supportive care to prevent cardiovascular
collapse.
3. A patient presents with a ‘buffalo hump,’ moon face, and central obesity. These findings
are most consistent with which endocrine disorder?
A. Cushing’s syndrome
B. Addison’s disease
C. Pheochromocytoma
D. Diabetes Insipidus
Answer: A
Rationale: Cushing’s syndrome results from prolonged exposure to excessively high levels
of cortisol, whether endogenous or exogenous. The classic physical features include a
redistribution of body fat, leading to a moon face and a fat pad between the shoulders
known as a buffalo hump. Other common symptoms include abdominal striae,
hypertension, and glucose intolerance.
, 4. In Syndrome of Inappropriate Antidiuretic Hormone (SIADH), what electrolyte imbalance is
primarily expected?
A. Hyperkalemia
B. Hyponatremia
C. Hypocalcemia
D. Hypernatremia
Answer: B
Rationale: SIADH involves the excessive release of antidiuretic hormone (ADH), which
causes the kidneys to retain water inappropriately. This excess water dilutes the sodium in
the extracellular fluid, resulting in dilutional hyponatremia. Patients often exhibit signs of
fluid overload without significant peripheral edema due to the intracellular shifts.
5. Exophthalmos (bulging eyes) is a distinctive feature of which autoimmune condition?
A. Hashimoto’s thyroiditis
B. Hypoparathyroidism
C. Graves’ disease
D. Acromegaly
Answer: C
Rationale: Graves’ disease is an autoimmune hyperthyroid condition caused by thyroid-
stimulating immunoglobulins. These antibodies bind to TSH receptors, causing the thyroid
Pathophysiology Q&A with Rationale |
William Paterson University
1. A 10-year-old child is diagnosed with Type 1 Diabetes Mellitus. What is the primary
pathophysiology behind this condition?
A. Insulin resistance in peripheral tissues
B. Hypersecretion of glucagon by alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Excessive dietary intake of simple sugars
Answer: C
Rationale: Type 1 Diabetes Mellitus involves an autoimmune-mediated destruction of the
insulin-producing beta cells in the pancreas. This process leads to an absolute deficiency of
insulin, making the patient dependent on exogenous insulin for survival. Without insulin,
glucose cannot enter the cells for energy, leading to systemic hyperglycemia and metabolic
disturbances.
2. Which clinical manifestation is most characteristic of Myxedema coma?
A. Hyperthermia and tachycardia
B. Rapid speech and hyper-reflexia
C. Hypotension and hypoventilation
,D. Diarrhea and weight loss
Answer: C
Rationale: Myxedema coma is a life-threatening complication of severe, untreated
hypothyroidism. It is characterized by extreme lethargy, hypothermia, and respiratory
depression leading to hypoventilation. Management requires immediate intravenous
thyroid hormone replacement and intensive supportive care to prevent cardiovascular
collapse.
3. A patient presents with a ‘buffalo hump,’ moon face, and central obesity. These findings
are most consistent with which endocrine disorder?
A. Cushing’s syndrome
B. Addison’s disease
C. Pheochromocytoma
D. Diabetes Insipidus
Answer: A
Rationale: Cushing’s syndrome results from prolonged exposure to excessively high levels
of cortisol, whether endogenous or exogenous. The classic physical features include a
redistribution of body fat, leading to a moon face and a fat pad between the shoulders
known as a buffalo hump. Other common symptoms include abdominal striae,
hypertension, and glucose intolerance.
, 4. In Syndrome of Inappropriate Antidiuretic Hormone (SIADH), what electrolyte imbalance is
primarily expected?
A. Hyperkalemia
B. Hyponatremia
C. Hypocalcemia
D. Hypernatremia
Answer: B
Rationale: SIADH involves the excessive release of antidiuretic hormone (ADH), which
causes the kidneys to retain water inappropriately. This excess water dilutes the sodium in
the extracellular fluid, resulting in dilutional hyponatremia. Patients often exhibit signs of
fluid overload without significant peripheral edema due to the intracellular shifts.
5. Exophthalmos (bulging eyes) is a distinctive feature of which autoimmune condition?
A. Hashimoto’s thyroiditis
B. Hypoparathyroidism
C. Graves’ disease
D. Acromegaly
Answer: C
Rationale: Graves’ disease is an autoimmune hyperthyroid condition caused by thyroid-
stimulating immunoglobulins. These antibodies bind to TSH receptors, causing the thyroid
