NURS 5315 Exam 4 V2 | NURS 5315
Advanced Pathophysiology | Actual Q&A
with Rationale (NURS5315 Exam 4) | The
University of Texas at Arlington
1. A patient presents with extreme polyuria and a urine specific gravity of 1.002. Which
pathophysiological mechanism is most likely responsible for this condition?
A. Insulin resistance in peripheral tissues
B. Excessive secretion of aldosterone
C. Deficiency of Antidiuretic Hormone (ADH) secretion
D. Hypersecretion of atrial natriuretic peptide
Answer: C
Rationale: Diabetes Insipidus (DI) is characterized by a deficiency of ADH or a decreased
renal response to it, preventing water reabsorption in the collecting ducts. This leads to the
excretion of large volumes of dilute urine, which is reflected in a very low specific gravity.
Clinical management focuses on fluid replacement and, in neurogenic cases, administration
of synthetic vasopressin.
2. In Syndrome of Inappropriate Antidiuretic Hormone (SIADH), which electrolyte imbalance
is the primary clinical concern?
A. Hyperkalemia
,B. Hyponatremia
C. Hypocalcemia
D. Hypernatremia
Answer: B
Rationale: SIADH involves excessive ADH secretion, which causes the kidneys to retain
water inappropriately, leading to dilutional hyponatremia. The expanded extracellular fluid
volume suppresses renin and aldosterone, further increasing sodium loss in the urine.
Severe hyponatremia can cause cerebral edema, resulting in seizures or coma if the sodium
level drops rapidly.
3. Which clinical manifestation is most characteristic of excessive cortisol production in
Cushing’s Syndrome?
A. Adipose tissue redistribution resulting in a moon face
B. Significant weight loss and hypotension
C. Hypoglycemia and increased insulin sensitivity
D. Hyperpigmentation of the skin and mucous membranes
Answer: A
Rationale: Cushing’s syndrome is caused by chronic exposure to excess glucocorticoids,
which alters fat metabolism and distribution. This leads to the classic physical findings of a
‘moon face,’ ‘buffalo hump,’ and central obesity with thin extremities. Additionally, cortisol
,has a glucose-sparing effect, which often leads to hyperglycemia and secondary diabetes
mellitus in these patients.
4. A patient with pheochromocytoma is likely to exhibit which of the following classic
symptom triads?
A. Bradycardia, hypotension, and lethargy
B. Hypertension, diaphoresis, and tachycardia
C. Polyuria, polydipsia, and polyphagia
D. Hyporeflexia, constipation, and cold intolerance
Answer: B
Rationale: Pheochromocytomas are catecholamine-secreting tumors of the adrenal
medulla that cause massive releases of epinephrine and norepinephrine. The resulting
sympathetic overactivity produces paroxysmal or sustained hypertension, palpitations, and
excessive sweating. Prompt diagnosis is critical because untreated pheochromocytoma can
lead to lethal cardiovascular events like stroke or myocardial infarction.
5. What is the primary underlying pathology in Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Resistance to insulin at the cellular level
C. Excessive glucagon secretion from alpha cells
D. Downregulation of insulin receptors in adipose tissue
, Answer: A
Rationale: Type 1 Diabetes Mellitus is an autoimmune disorder where T-cell mediated
destruction targets the insulin-producing beta cells in the Islets of Langerhans. This leads
to an absolute insulin deficiency, requiring exogenous insulin for survival and to prevent
ketoacidosis. Genetic predisposition and environmental triggers are thought to play
significant roles in the initiation of this immune response.
6. A patient with Grave’s Disease presents with bulging eyes. What is the correct term for this
and its cause?
A. Exophthalmos caused by orbital fat and muscle inflammation
B. Ptosis caused by cranial nerve palsy
C. Nystagmus caused by hyperthyroid encephalopathy
D. Mydriasis caused by sympathetic overstimulation
Answer: A
Rationale: Exophthalmos is a hallmark sign of Grave’s disease, an autoimmune form of
hyperthyroidism where TSH-receptor antibodies stimulate the thyroid. These antibodies
also react with antigens in the extraocular muscles and orbital fibroblasts, leading to
inflammation and edema. The resulting accumulation of connective tissue and fat pushes
the eyeball forward, potentially compromising vision if severe.
7. Which finding in the cerebrospinal fluid (CSF) is most indicative of bacterial meningitis?
A. Elevated glucose and low protein
Advanced Pathophysiology | Actual Q&A
with Rationale (NURS5315 Exam 4) | The
University of Texas at Arlington
1. A patient presents with extreme polyuria and a urine specific gravity of 1.002. Which
pathophysiological mechanism is most likely responsible for this condition?
A. Insulin resistance in peripheral tissues
B. Excessive secretion of aldosterone
C. Deficiency of Antidiuretic Hormone (ADH) secretion
D. Hypersecretion of atrial natriuretic peptide
Answer: C
Rationale: Diabetes Insipidus (DI) is characterized by a deficiency of ADH or a decreased
renal response to it, preventing water reabsorption in the collecting ducts. This leads to the
excretion of large volumes of dilute urine, which is reflected in a very low specific gravity.
Clinical management focuses on fluid replacement and, in neurogenic cases, administration
of synthetic vasopressin.
2. In Syndrome of Inappropriate Antidiuretic Hormone (SIADH), which electrolyte imbalance
is the primary clinical concern?
A. Hyperkalemia
,B. Hyponatremia
C. Hypocalcemia
D. Hypernatremia
Answer: B
Rationale: SIADH involves excessive ADH secretion, which causes the kidneys to retain
water inappropriately, leading to dilutional hyponatremia. The expanded extracellular fluid
volume suppresses renin and aldosterone, further increasing sodium loss in the urine.
Severe hyponatremia can cause cerebral edema, resulting in seizures or coma if the sodium
level drops rapidly.
3. Which clinical manifestation is most characteristic of excessive cortisol production in
Cushing’s Syndrome?
A. Adipose tissue redistribution resulting in a moon face
B. Significant weight loss and hypotension
C. Hypoglycemia and increased insulin sensitivity
D. Hyperpigmentation of the skin and mucous membranes
Answer: A
Rationale: Cushing’s syndrome is caused by chronic exposure to excess glucocorticoids,
which alters fat metabolism and distribution. This leads to the classic physical findings of a
‘moon face,’ ‘buffalo hump,’ and central obesity with thin extremities. Additionally, cortisol
,has a glucose-sparing effect, which often leads to hyperglycemia and secondary diabetes
mellitus in these patients.
4. A patient with pheochromocytoma is likely to exhibit which of the following classic
symptom triads?
A. Bradycardia, hypotension, and lethargy
B. Hypertension, diaphoresis, and tachycardia
C. Polyuria, polydipsia, and polyphagia
D. Hyporeflexia, constipation, and cold intolerance
Answer: B
Rationale: Pheochromocytomas are catecholamine-secreting tumors of the adrenal
medulla that cause massive releases of epinephrine and norepinephrine. The resulting
sympathetic overactivity produces paroxysmal or sustained hypertension, palpitations, and
excessive sweating. Prompt diagnosis is critical because untreated pheochromocytoma can
lead to lethal cardiovascular events like stroke or myocardial infarction.
5. What is the primary underlying pathology in Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Resistance to insulin at the cellular level
C. Excessive glucagon secretion from alpha cells
D. Downregulation of insulin receptors in adipose tissue
, Answer: A
Rationale: Type 1 Diabetes Mellitus is an autoimmune disorder where T-cell mediated
destruction targets the insulin-producing beta cells in the Islets of Langerhans. This leads
to an absolute insulin deficiency, requiring exogenous insulin for survival and to prevent
ketoacidosis. Genetic predisposition and environmental triggers are thought to play
significant roles in the initiation of this immune response.
6. A patient with Grave’s Disease presents with bulging eyes. What is the correct term for this
and its cause?
A. Exophthalmos caused by orbital fat and muscle inflammation
B. Ptosis caused by cranial nerve palsy
C. Nystagmus caused by hyperthyroid encephalopathy
D. Mydriasis caused by sympathetic overstimulation
Answer: A
Rationale: Exophthalmos is a hallmark sign of Grave’s disease, an autoimmune form of
hyperthyroidism where TSH-receptor antibodies stimulate the thyroid. These antibodies
also react with antigens in the extraocular muscles and orbital fibroblasts, leading to
inflammation and edema. The resulting accumulation of connective tissue and fat pushes
the eyeball forward, potentially compromising vision if severe.
7. Which finding in the cerebrospinal fluid (CSF) is most indicative of bacterial meningitis?
A. Elevated glucose and low protein
