NURS 231/NURS231 Module 6 V3 |
Pathophysiology Q&A with Rationale | Portage
Learning
1. A patient presents with low serum sodium, high urine osmolarity, and clinical signs of fluid
overload without edema. Which endocrine disorder is most likely responsible?
A. Diabetes Insipidus
B. Cushing’s Syndrome
C. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
D. Hashimoto’s Thyroiditis
Correct Answer: C
Explanation: SIADH is characterized by the excessive release of ADH, which leads to water
retention and dilutional hyponatremia. The kidneys continue to excrete sodium despite the
low serum levels, resulting in high urine osmolarity. This condition is often associated with
ectopic hormone production from tumors or CNS disorders.
2. Which clinical manifestation is a hallmark sign of Graves’ Disease that distinguishes it from
other forms of hyperthyroidism?
A. Exophthalmos
B. Weight loss
C. Tachycardia
,D. Heat intolerance
Correct Answer: A
Explanation: Exophthalmos, or bulging of the eyes, is specific to Graves’ Disease due to
autoimmune-mediated inflammation of the extraocular muscles. While tachycardia and
weight loss occur in most hyperthyroid states, they are not specific to the autoimmune
etiology of Graves’. This condition involves antibodies that stimulate the TSH receptor,
leading to diffuse thyroid enlargement.
3. In Type 1 Diabetes Mellitus, what is the primary pathophysiological mechanism leading to
hyperglycemia?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive glucagon production by alpha cells
D. Increased glucose absorption in the small intestine
Correct Answer: A
Explanation: Type 1 Diabetes is an autoimmune condition where the body’s immune
system attacks and destroys the insulin-producing beta cells in the Islets of Langerhans.
This results in an absolute insulin deficiency, requiring exogenous insulin for survival.
Without insulin, glucose cannot enter the cells, leading to severe hyperglycemia and
potential ketoacidosis.
, 4. A patient with a history of chronic corticosteroid use for rheumatoid arthritis stops their
medication abruptly. Which condition are they at highest risk for developing?
A. Cushing’s Disease
B. Acute Adrenal Crisis (Addisonian Crisis)
C. Thyroid Storm
D. Pheochromocytoma
Correct Answer: B
Explanation: Chronic exogenous steroid use suppresses the hypothalamic-pituitary-
adrenal (HPA) axis, causing the adrenal cortex to atrophy. Abrupt withdrawal leaves the
body without sufficient cortisol to handle physiological stress, leading to a life-threatening
crisis. Symptoms include severe hypotension, electrolyte imbalances, and vascular collapse.
5. Which laboratory finding is most consistent with primary hypothyroidism?
A. Low TSH and Low T4
B. High TSH and Low T4
C. High TSH and High T4
D. Low TSH and High T4
Correct Answer: B
Explanation: In primary hypothyroidism, the thyroid gland fails to produce sufficient T4
despite stimulation. This lack of negative feedback causes the anterior pituitary to secrete
Pathophysiology Q&A with Rationale | Portage
Learning
1. A patient presents with low serum sodium, high urine osmolarity, and clinical signs of fluid
overload without edema. Which endocrine disorder is most likely responsible?
A. Diabetes Insipidus
B. Cushing’s Syndrome
C. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
D. Hashimoto’s Thyroiditis
Correct Answer: C
Explanation: SIADH is characterized by the excessive release of ADH, which leads to water
retention and dilutional hyponatremia. The kidneys continue to excrete sodium despite the
low serum levels, resulting in high urine osmolarity. This condition is often associated with
ectopic hormone production from tumors or CNS disorders.
2. Which clinical manifestation is a hallmark sign of Graves’ Disease that distinguishes it from
other forms of hyperthyroidism?
A. Exophthalmos
B. Weight loss
C. Tachycardia
,D. Heat intolerance
Correct Answer: A
Explanation: Exophthalmos, or bulging of the eyes, is specific to Graves’ Disease due to
autoimmune-mediated inflammation of the extraocular muscles. While tachycardia and
weight loss occur in most hyperthyroid states, they are not specific to the autoimmune
etiology of Graves’. This condition involves antibodies that stimulate the TSH receptor,
leading to diffuse thyroid enlargement.
3. In Type 1 Diabetes Mellitus, what is the primary pathophysiological mechanism leading to
hyperglycemia?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive glucagon production by alpha cells
D. Increased glucose absorption in the small intestine
Correct Answer: A
Explanation: Type 1 Diabetes is an autoimmune condition where the body’s immune
system attacks and destroys the insulin-producing beta cells in the Islets of Langerhans.
This results in an absolute insulin deficiency, requiring exogenous insulin for survival.
Without insulin, glucose cannot enter the cells, leading to severe hyperglycemia and
potential ketoacidosis.
, 4. A patient with a history of chronic corticosteroid use for rheumatoid arthritis stops their
medication abruptly. Which condition are they at highest risk for developing?
A. Cushing’s Disease
B. Acute Adrenal Crisis (Addisonian Crisis)
C. Thyroid Storm
D. Pheochromocytoma
Correct Answer: B
Explanation: Chronic exogenous steroid use suppresses the hypothalamic-pituitary-
adrenal (HPA) axis, causing the adrenal cortex to atrophy. Abrupt withdrawal leaves the
body without sufficient cortisol to handle physiological stress, leading to a life-threatening
crisis. Symptoms include severe hypotension, electrolyte imbalances, and vascular collapse.
5. Which laboratory finding is most consistent with primary hypothyroidism?
A. Low TSH and Low T4
B. High TSH and Low T4
C. High TSH and High T4
D. Low TSH and High T4
Correct Answer: B
Explanation: In primary hypothyroidism, the thyroid gland fails to produce sufficient T4
despite stimulation. This lack of negative feedback causes the anterior pituitary to secrete
