National University NUR 510 Module 4 (pdf) | 2026/2027 | Advanced
Pathophysiology Q&A | Nursing
1. A 45-year-old patient with a history of polyuria, polydipsia, and polyphagia
presents with a random blood glucose of 320 mg/dL. Which of the following is
the most likely underlying pathophysiological mechanism?
A) Autoimmune destruction of pancreatic beta cells leading to absolute
insulin deficiency
B) Peripheral insulin resistance with relative insulin deficiency
C) Excessive production of glucagon by pancreatic alpha cells
D) Impaired glucose uptake due to glucocorticoid excess
Correct Answer: Autoimmune destruction of pancreatic beta cells leading to
absolute insulin deficiency
Rationale: The classic triad of polyuria, polydipsia, and polyphagia with a
markedly elevated random glucose suggests new-onset Type 1 diabetes
mellitus. This condition results from autoimmune destruction of pancreatic
beta cells, causing absolute insulin deficiency, distinguishing it from Type 2
diabetes which involves insulin resistance.
2. A 62-year-old patient with a history of hypertension and obesity presents
with fatigue and weight gain. Laboratory studies reveal a fasting glucose of
148 mg/dL and an HbA1c of 7.8%. Which pathophysiological process best
explains these findings?
A) Absolute insulin deficiency due to beta-cell destruction
B) Insulin resistance with compensatory hyperinsulinemia and eventual beta-
cell failure
C) Impaired glucose absorption from the gastrointestinal tract
D) Excessive hepatic glycogenolysis due to glucagon excess
,Correct Answer: Insulin resistance with compensatory hyperinsulinemia and
eventual beta-cell failure
Rationale: Type 2 diabetes mellitus is characterized by insulin resistance in
peripheral tissues, leading to compensatory hyperinsulinemia. Over time,
pancreatic beta cells fail to sustain this compensatory response, resulting in
hyperglycemia. This mechanism is strongly associated with obesity and
hypertension.
3. A patient with Type 1 diabetes mellitus presents with nausea, vomiting,
abdominal pain, and fruity odor on the breath. Arterial blood gas reveals a
pH of 7.20 and bicarbonate of 12 mEq/L. This clinical presentation is most
consistent with:
A) Hyperosmolar hyperglycemic state
B) Diabetic ketoacidosis
C) Lactic acidosis
D) Starvation ketosis
Correct Answer: Diabetic ketoacidosis
Rationale: Diabetic ketoacidosis (DKA) is a life-threatening complication of
Type 1 diabetes characterized by hyperglycemia, ketosis, and metabolic
acidosis. The fruity breath odor is due to acetone production. DKA results
from absolute insulin deficiency leading to increased lipolysis and ketone
body formation.
4. A 55-year-old patient with Type 2 diabetes mellitus presents with
confusion, lethargy, and a blood glucose of 680 mg/dL. Serum osmolality is
340 mOsm/kg, and no significant ketones are detected in the urine. This
presentation is most consistent with:
A) Diabetic ketoacidosis
B) Hyperosmolar hyperglycemic state
,C) Alcoholic ketoacidosis
D) Lactic acidosis
Correct Answer: Hyperosmolar hyperglycemic state
Rationale: Hyperosmolar hyperglycemic state (HHS) typically occurs in older
adults with Type 2 diabetes and is characterized by severe hyperglycemia,
hyperosmolality, and dehydration without significant ketosis. HHS results
from relative insulin deficiency and increased counterregulatory hormones,
leading to profound hyperglycemia and osmotic diuresis.
5. A 28-year-old female with a history of Graves' disease presents with
palpitations, heat intolerance, and weight loss despite increased appetite.
Which of the following best describes the underlying pathophysiology of this
condition?
A) Autoimmune destruction of the thyroid gland leading to hormone
deficiency
B) Autoantibodies that stimulate the thyroid-stimulating hormone receptor,
causing excessive thyroid hormone production
C) A benign tumor of the pituitary gland secreting excess thyroid-stimulating
hormone
D) Dietary iodine deficiency leading to increased thyroid-stimulating
hormone secretion
Correct Answer: Autoantibodies that stimulate the thyroid-stimulating
hormone receptor, causing excessive thyroid hormone production
Rationale: Graves' disease is an autoimmune disorder caused by thyroid-
stimulating immunoglobulins (TSI) that bind to and activate the TSH receptor
on thyroid follicular cells. This results in unregulated production and release
of thyroid hormones, leading to hyperthyroidism.
, 6. A 35-year-old female presents with fatigue, cold intolerance, weight gain,
and constipation. Laboratory studies reveal elevated thyroid-stimulating
hormone (TSH) and low free T4 levels. This presentation is most consistent
with:
A) Graves' disease
B) Toxic multinodular goiter
C) Primary hypothyroidism
D) Euthyroid sick syndrome
Correct Answer: Primary hypothyroidism
Rationale: Primary hypothyroidism is characterized by elevated TSH and low
free T4, indicating a failure of the thyroid gland itself. The classic symptoms
include fatigue, cold intolerance, weight gain, and constipation, reflecting
decreased metabolic rate from thyroid hormone deficiency.
7. A 50-year-old patient with a known goiter presents with difficulty
swallowing and a sensation of neck fullness. Ultrasound reveals a solitary,
cold nodule on radioactive iodine scanning. Which of the following is the
most appropriate next step in management?
A) Fine-needle aspiration biopsy
B) Levothyroxine suppression therapy
C) Radioactive iodine ablation
D) Observation with repeat ultrasound in 6 months
Correct Answer: Fine-needle aspiration biopsy
Rationale: A solitary cold nodule has a higher risk of malignancy compared to
hot nodules. Fine-needle aspiration (FNA) biopsy is the gold standard for
evaluating thyroid nodules to differentiate benign from malignant lesions and
guide further management.
Pathophysiology Q&A | Nursing
1. A 45-year-old patient with a history of polyuria, polydipsia, and polyphagia
presents with a random blood glucose of 320 mg/dL. Which of the following is
the most likely underlying pathophysiological mechanism?
A) Autoimmune destruction of pancreatic beta cells leading to absolute
insulin deficiency
B) Peripheral insulin resistance with relative insulin deficiency
C) Excessive production of glucagon by pancreatic alpha cells
D) Impaired glucose uptake due to glucocorticoid excess
Correct Answer: Autoimmune destruction of pancreatic beta cells leading to
absolute insulin deficiency
Rationale: The classic triad of polyuria, polydipsia, and polyphagia with a
markedly elevated random glucose suggests new-onset Type 1 diabetes
mellitus. This condition results from autoimmune destruction of pancreatic
beta cells, causing absolute insulin deficiency, distinguishing it from Type 2
diabetes which involves insulin resistance.
2. A 62-year-old patient with a history of hypertension and obesity presents
with fatigue and weight gain. Laboratory studies reveal a fasting glucose of
148 mg/dL and an HbA1c of 7.8%. Which pathophysiological process best
explains these findings?
A) Absolute insulin deficiency due to beta-cell destruction
B) Insulin resistance with compensatory hyperinsulinemia and eventual beta-
cell failure
C) Impaired glucose absorption from the gastrointestinal tract
D) Excessive hepatic glycogenolysis due to glucagon excess
,Correct Answer: Insulin resistance with compensatory hyperinsulinemia and
eventual beta-cell failure
Rationale: Type 2 diabetes mellitus is characterized by insulin resistance in
peripheral tissues, leading to compensatory hyperinsulinemia. Over time,
pancreatic beta cells fail to sustain this compensatory response, resulting in
hyperglycemia. This mechanism is strongly associated with obesity and
hypertension.
3. A patient with Type 1 diabetes mellitus presents with nausea, vomiting,
abdominal pain, and fruity odor on the breath. Arterial blood gas reveals a
pH of 7.20 and bicarbonate of 12 mEq/L. This clinical presentation is most
consistent with:
A) Hyperosmolar hyperglycemic state
B) Diabetic ketoacidosis
C) Lactic acidosis
D) Starvation ketosis
Correct Answer: Diabetic ketoacidosis
Rationale: Diabetic ketoacidosis (DKA) is a life-threatening complication of
Type 1 diabetes characterized by hyperglycemia, ketosis, and metabolic
acidosis. The fruity breath odor is due to acetone production. DKA results
from absolute insulin deficiency leading to increased lipolysis and ketone
body formation.
4. A 55-year-old patient with Type 2 diabetes mellitus presents with
confusion, lethargy, and a blood glucose of 680 mg/dL. Serum osmolality is
340 mOsm/kg, and no significant ketones are detected in the urine. This
presentation is most consistent with:
A) Diabetic ketoacidosis
B) Hyperosmolar hyperglycemic state
,C) Alcoholic ketoacidosis
D) Lactic acidosis
Correct Answer: Hyperosmolar hyperglycemic state
Rationale: Hyperosmolar hyperglycemic state (HHS) typically occurs in older
adults with Type 2 diabetes and is characterized by severe hyperglycemia,
hyperosmolality, and dehydration without significant ketosis. HHS results
from relative insulin deficiency and increased counterregulatory hormones,
leading to profound hyperglycemia and osmotic diuresis.
5. A 28-year-old female with a history of Graves' disease presents with
palpitations, heat intolerance, and weight loss despite increased appetite.
Which of the following best describes the underlying pathophysiology of this
condition?
A) Autoimmune destruction of the thyroid gland leading to hormone
deficiency
B) Autoantibodies that stimulate the thyroid-stimulating hormone receptor,
causing excessive thyroid hormone production
C) A benign tumor of the pituitary gland secreting excess thyroid-stimulating
hormone
D) Dietary iodine deficiency leading to increased thyroid-stimulating
hormone secretion
Correct Answer: Autoantibodies that stimulate the thyroid-stimulating
hormone receptor, causing excessive thyroid hormone production
Rationale: Graves' disease is an autoimmune disorder caused by thyroid-
stimulating immunoglobulins (TSI) that bind to and activate the TSH receptor
on thyroid follicular cells. This results in unregulated production and release
of thyroid hormones, leading to hyperthyroidism.
, 6. A 35-year-old female presents with fatigue, cold intolerance, weight gain,
and constipation. Laboratory studies reveal elevated thyroid-stimulating
hormone (TSH) and low free T4 levels. This presentation is most consistent
with:
A) Graves' disease
B) Toxic multinodular goiter
C) Primary hypothyroidism
D) Euthyroid sick syndrome
Correct Answer: Primary hypothyroidism
Rationale: Primary hypothyroidism is characterized by elevated TSH and low
free T4, indicating a failure of the thyroid gland itself. The classic symptoms
include fatigue, cold intolerance, weight gain, and constipation, reflecting
decreased metabolic rate from thyroid hormone deficiency.
7. A 50-year-old patient with a known goiter presents with difficulty
swallowing and a sensation of neck fullness. Ultrasound reveals a solitary,
cold nodule on radioactive iodine scanning. Which of the following is the
most appropriate next step in management?
A) Fine-needle aspiration biopsy
B) Levothyroxine suppression therapy
C) Radioactive iodine ablation
D) Observation with repeat ultrasound in 6 months
Correct Answer: Fine-needle aspiration biopsy
Rationale: A solitary cold nodule has a higher risk of malignancy compared to
hot nodules. Fine-needle aspiration (FNA) biopsy is the gold standard for
evaluating thyroid nodules to differentiate benign from malignant lesions and
guide further management.
