NUR 641EA Exam 4 V1 | NUR 641EA Advanced
Pathophysiology and Pharmacology for Nurse
Educators | Actual Q&A with Rationale (NUR641EA
Exam 4) | Grand Canyon University
1. A patient is admitted with suspected Type 1 Diabetes Mellitus. Which of the following
clinical manifestations and pathophysiology findings are consistent with this diagnosis?
(Select All That Apply)
A. Polydipsia and polyuria
B. Destruction of pancreatic beta cells
C. Hyperinsulinemia due to peripheral resistance
D. Weight loss despite increased appetite
E. Ketosis-prone state
F. Acanthosis nigricans
Correct Answer: A, B, D, E
Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
typically resulting from autoimmune destruction of pancreatic beta cells. This lack of
insulin leads to hyperglycemia, osmotic diuresis (polyuria), and compensatory thirst
(polydipsia). Because cells cannot utilize glucose for energy, the body breaks down fats and
proteins, resulting in weight loss and the production of ketones, which can lead to
ketoacidosis. Acanthosis nigricans and hyperinsulinemia are more characteristic of Type 2
,Diabetes and insulin resistance rather than the absolute deficiency seen in Type 1. The
nurse educator must emphasize that these patients are dependent on exogenous insulin for
survival to prevent metabolic collapse. Diagnostic confirmation often involves testing for
autoantibodies such as GAD65.
2. Which laboratory finding is most definitive in distinguishing between Primary
Hypothyroidism and Secondary Hypothyroidism?
A. Free T4 levels
B. Thyroid Stimulating Hormone (TSH) level
C. Thyroid Peroxidase (TPO) antibodies
D. Serum Iodine levels
Correct Answer: B
Explanation: In primary hypothyroidism, the defect is in the thyroid gland itself, leading to
low T4 levels which trigger the pituitary to increase TSH production through a negative
feedback loop. Conversely, secondary hypothyroidism results from pituitary dysfunction,
where the TSH level will be inappropriately low or low-normal despite low circulating T4.
Understanding the hypothalamic-pituitary-thyroid axis is crucial for correctly interpreting
these thyroid function tests. Nurse educators should highlight that TSH is the most
sensitive screening tool for primary thyroid disorders. Treatment strategies differ
significantly depending on the level of the endocrine dysfunction.
,3. A patient presents with weight gain, truncal obesity, a ‘buffalo hump,’ and purple striae on
the abdomen. Which diagnostic test would the clinician anticipate to confirm Cushing’s
Syndrome?
A. 24-hour urinary free cortisol
B. Morning serum ACTH
C. Late-night salivary cortisol
D. All of the above may be used for initial screening
E. Low-dose dexamethasone suppression test
Correct Answer: D
Explanation: Cushing’s syndrome is characterized by chronic exposure to excess
glucocorticoids, and multiple tests are used to establish hypercortisolism. Initial screening
typically includes the 24-hour urinary free cortisol, late-night salivary cortisol, or the
overnight low-dose dexamethasone suppression test. The presence of physical signs like
truncal obesity and purple striae strongly suggests the diagnosis, but biochemical
confirmation is required before imaging. Once hypercortisolism is confirmed, ACTH levels
are then used to differentiate between ACTH-dependent and ACTH-independent causes.
Educator interventions should focus on the physiological implications of excess cortisol,
including hypertension and impaired glucose tolerance.
, 4. A patient with Diabetes Insipidus (DI) is receiving desmopressin. Which physiological
change indicates the medication is effective?
A. Decrease in urine specific gravity
B. Increase in serum sodium concentration
C. Decrease in urine output
D. Increase in serum osmolarity
Correct Answer: C
Explanation: Diabetes Insipidus involves a deficiency of or resistance to ADH, leading to
the excretion of large volumes of dilute urine. Desmopressin acts as an ADH analogue,
increasing water reabsorption in the collecting ducts of the kidneys. Effective treatment
results in decreased urine output and an increase in urine specific gravity as the urine
becomes more concentrated. Serum sodium and serum osmolarity should stabilize or
decrease toward normal ranges, not increase. Patients must be monitored closely for water
intoxication if fluid intake is not regulated alongside desmopressin therapy.
5. Which of the following is the hallmark pathophysiological feature of Graves’ disease?
A. Destruction of thyroid follicles by cytotoxic T-cells
B. Inadequate dietary iodine intake
C. Production of thyroid-stimulating immunoglobulins (TSI)
D. Benign adenoma of the anterior pituitary
Pathophysiology and Pharmacology for Nurse
Educators | Actual Q&A with Rationale (NUR641EA
Exam 4) | Grand Canyon University
1. A patient is admitted with suspected Type 1 Diabetes Mellitus. Which of the following
clinical manifestations and pathophysiology findings are consistent with this diagnosis?
(Select All That Apply)
A. Polydipsia and polyuria
B. Destruction of pancreatic beta cells
C. Hyperinsulinemia due to peripheral resistance
D. Weight loss despite increased appetite
E. Ketosis-prone state
F. Acanthosis nigricans
Correct Answer: A, B, D, E
Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
typically resulting from autoimmune destruction of pancreatic beta cells. This lack of
insulin leads to hyperglycemia, osmotic diuresis (polyuria), and compensatory thirst
(polydipsia). Because cells cannot utilize glucose for energy, the body breaks down fats and
proteins, resulting in weight loss and the production of ketones, which can lead to
ketoacidosis. Acanthosis nigricans and hyperinsulinemia are more characteristic of Type 2
,Diabetes and insulin resistance rather than the absolute deficiency seen in Type 1. The
nurse educator must emphasize that these patients are dependent on exogenous insulin for
survival to prevent metabolic collapse. Diagnostic confirmation often involves testing for
autoantibodies such as GAD65.
2. Which laboratory finding is most definitive in distinguishing between Primary
Hypothyroidism and Secondary Hypothyroidism?
A. Free T4 levels
B. Thyroid Stimulating Hormone (TSH) level
C. Thyroid Peroxidase (TPO) antibodies
D. Serum Iodine levels
Correct Answer: B
Explanation: In primary hypothyroidism, the defect is in the thyroid gland itself, leading to
low T4 levels which trigger the pituitary to increase TSH production through a negative
feedback loop. Conversely, secondary hypothyroidism results from pituitary dysfunction,
where the TSH level will be inappropriately low or low-normal despite low circulating T4.
Understanding the hypothalamic-pituitary-thyroid axis is crucial for correctly interpreting
these thyroid function tests. Nurse educators should highlight that TSH is the most
sensitive screening tool for primary thyroid disorders. Treatment strategies differ
significantly depending on the level of the endocrine dysfunction.
,3. A patient presents with weight gain, truncal obesity, a ‘buffalo hump,’ and purple striae on
the abdomen. Which diagnostic test would the clinician anticipate to confirm Cushing’s
Syndrome?
A. 24-hour urinary free cortisol
B. Morning serum ACTH
C. Late-night salivary cortisol
D. All of the above may be used for initial screening
E. Low-dose dexamethasone suppression test
Correct Answer: D
Explanation: Cushing’s syndrome is characterized by chronic exposure to excess
glucocorticoids, and multiple tests are used to establish hypercortisolism. Initial screening
typically includes the 24-hour urinary free cortisol, late-night salivary cortisol, or the
overnight low-dose dexamethasone suppression test. The presence of physical signs like
truncal obesity and purple striae strongly suggests the diagnosis, but biochemical
confirmation is required before imaging. Once hypercortisolism is confirmed, ACTH levels
are then used to differentiate between ACTH-dependent and ACTH-independent causes.
Educator interventions should focus on the physiological implications of excess cortisol,
including hypertension and impaired glucose tolerance.
, 4. A patient with Diabetes Insipidus (DI) is receiving desmopressin. Which physiological
change indicates the medication is effective?
A. Decrease in urine specific gravity
B. Increase in serum sodium concentration
C. Decrease in urine output
D. Increase in serum osmolarity
Correct Answer: C
Explanation: Diabetes Insipidus involves a deficiency of or resistance to ADH, leading to
the excretion of large volumes of dilute urine. Desmopressin acts as an ADH analogue,
increasing water reabsorption in the collecting ducts of the kidneys. Effective treatment
results in decreased urine output and an increase in urine specific gravity as the urine
becomes more concentrated. Serum sodium and serum osmolarity should stabilize or
decrease toward normal ranges, not increase. Patients must be monitored closely for water
intoxication if fluid intake is not regulated alongside desmopressin therapy.
5. Which of the following is the hallmark pathophysiological feature of Graves’ disease?
A. Destruction of thyroid follicles by cytotoxic T-cells
B. Inadequate dietary iodine intake
C. Production of thyroid-stimulating immunoglobulins (TSI)
D. Benign adenoma of the anterior pituitary
