NURS 611 Exam 4 V1 | NURS 611
Advanced Pathophysiology | Maryville
University of St. Louis | 2026 Q&A with
Rationale (Maryville NURS611 Exam 4
2026)
1. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which of the following laboratory results is most consistent with this diagnosis?
A. Serum sodium 128 mEq/L
B. Serum osmolality 310 mOsm/kg
C. Urine specific gravity 1.001
D. Hypernatremia and dehydration
Correct Answer: A
Rationale: SIADH involves the excessive release of antidiuretic hormone, which causes the
kidneys to reabsorb too much water. This process leads to dilutional hyponatremia and a
decrease in serum osmolality. Patients typically present with concentrated urine and
expanded extracellular fluid volume without edema.
2. Which pathophysiological mechanism explains the polyuria observed in patients with
Diabetes Insipidus?
A. High serum glucose levels causing osmotic diuresis
,B. Inadequate ADH production or renal response to ADH
C. Increased glomerular filtration rate (GFR)
D. Excessive intake of oral fluids
Correct Answer: B
Rationale: Diabetes Insipidus is characterized by an insufficiency of ADH (neurogenic) or a
lack of renal response to ADH (nephrogenic). Without the action of ADH on the distal
tubules and collecting ducts, the kidneys cannot concentrate urine. This results in the
excretion of large volumes of dilute urine and subsequent polydipsia.
3. A patient presents with weight gain, moon face, and a ‘buffalo hump.’ Which hormonal
imbalance is the primary cause of these symptoms?
A. Excessive secretion of cortisol
B. Deficiency of aldosterone
C. Hypersecretion of growth hormone
D. Insulin resistance and hypoglycemia
Correct Answer: A
Rationale: Cushing syndrome is caused by prolonged exposure to high levels of cortisol,
whether endogenous or exogenous. The classic physical signs include truncal obesity,
moon facies, and a cervical fat pad known as a buffalo hump. Cortisol excess also leads to
glucose intolerance and protein wasting in the extremities.
, 4. What is the primary underlying cause of Type 1 Diabetes Mellitus?
A. Peripheral insulin resistance in muscle cells
B. Excessive glucagon secretion from alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Chronic inflammation of the exocrine pancreas
Correct Answer: C
Rationale: Type 1 Diabetes Mellitus results from a T-cell mediated autoimmune attack on
the insulin-producing beta cells of the pancreas. This destruction leads to an absolute
insulin deficiency, necessitating lifelong exogenous insulin replacement. The disease often
presents acutely in childhood or adolescence with symptoms like polyuria and weight loss.
5. A patient has a Goiter and exophthalmos. The lab reports low TSH and high Free T4. Which
condition is most likely?
A. Hashimoto Thyroiditis
B. Myxedema Coma
C. Graves Disease
D. Secondary Hypothyroidism
Correct Answer: C
Rationale: Graves disease is an autoimmune disorder where thyroid-stimulating
immunoglobulins (TSI) bind to and activate TSH receptors. This leads to hyperthyroidism,
Advanced Pathophysiology | Maryville
University of St. Louis | 2026 Q&A with
Rationale (Maryville NURS611 Exam 4
2026)
1. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which of the following laboratory results is most consistent with this diagnosis?
A. Serum sodium 128 mEq/L
B. Serum osmolality 310 mOsm/kg
C. Urine specific gravity 1.001
D. Hypernatremia and dehydration
Correct Answer: A
Rationale: SIADH involves the excessive release of antidiuretic hormone, which causes the
kidneys to reabsorb too much water. This process leads to dilutional hyponatremia and a
decrease in serum osmolality. Patients typically present with concentrated urine and
expanded extracellular fluid volume without edema.
2. Which pathophysiological mechanism explains the polyuria observed in patients with
Diabetes Insipidus?
A. High serum glucose levels causing osmotic diuresis
,B. Inadequate ADH production or renal response to ADH
C. Increased glomerular filtration rate (GFR)
D. Excessive intake of oral fluids
Correct Answer: B
Rationale: Diabetes Insipidus is characterized by an insufficiency of ADH (neurogenic) or a
lack of renal response to ADH (nephrogenic). Without the action of ADH on the distal
tubules and collecting ducts, the kidneys cannot concentrate urine. This results in the
excretion of large volumes of dilute urine and subsequent polydipsia.
3. A patient presents with weight gain, moon face, and a ‘buffalo hump.’ Which hormonal
imbalance is the primary cause of these symptoms?
A. Excessive secretion of cortisol
B. Deficiency of aldosterone
C. Hypersecretion of growth hormone
D. Insulin resistance and hypoglycemia
Correct Answer: A
Rationale: Cushing syndrome is caused by prolonged exposure to high levels of cortisol,
whether endogenous or exogenous. The classic physical signs include truncal obesity,
moon facies, and a cervical fat pad known as a buffalo hump. Cortisol excess also leads to
glucose intolerance and protein wasting in the extremities.
, 4. What is the primary underlying cause of Type 1 Diabetes Mellitus?
A. Peripheral insulin resistance in muscle cells
B. Excessive glucagon secretion from alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Chronic inflammation of the exocrine pancreas
Correct Answer: C
Rationale: Type 1 Diabetes Mellitus results from a T-cell mediated autoimmune attack on
the insulin-producing beta cells of the pancreas. This destruction leads to an absolute
insulin deficiency, necessitating lifelong exogenous insulin replacement. The disease often
presents acutely in childhood or adolescence with symptoms like polyuria and weight loss.
5. A patient has a Goiter and exophthalmos. The lab reports low TSH and high Free T4. Which
condition is most likely?
A. Hashimoto Thyroiditis
B. Myxedema Coma
C. Graves Disease
D. Secondary Hypothyroidism
Correct Answer: C
Rationale: Graves disease is an autoimmune disorder where thyroid-stimulating
immunoglobulins (TSI) bind to and activate TSH receptors. This leads to hyperthyroidism,
