HSC 4558 Exam 3V1 | HSC 4558 Pathophysiology II | Actual Q&A with
Rationale (HSC4558 Exam 3) | University of Central Florida
1. A patient presents with low serum sodium levels, high urine osmolality, and symptoms of
water intoxication. Which condition is most likely responsible for these findings?
A. Hypoparathyroidism
B. Diabetes Insipidus
C. Cushing Syndrome
D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Explanation: SIADH involves the excessive release of ADH, leading to water retention and
dilutional hyponatremia. The kidneys continue to excrete concentrated urine despite low
serum osmolality. This pathophysiology is the opposite of Diabetes Insipidus, where there
is a lack of ADH effect.
2. Which of the following is considered a pre-renal cause of Acute Kidney Injury (AKI)?
A. Acute tubular necrosis
B. Benign prostatic hyperplasia
C. Severe dehydration and hypovolemia
D. Glomerulonephritis
Answer: C
Explanation: Pre-renal AKI is caused by factors that decrease systemic blood flow to the
kidneys, such as hypovolemia or heart failure. This reduction in perfusion leads to a
decreased glomerular filtration rate without initial damage to the parenchyma. In contrast,
intra-renal causes involve direct damage to kidney tissues, while post-renal causes involve
obstruction.
3. In the context of liver cirrhosis, what is the primary pathophysiological mechanism leading
to the development of esophageal varices?
A. Hypoalbuminemia
B. Portal hypertension
C. Increased ammonia levels
D. Decreased clotting factors
,Answer: B
Explanation: Portal hypertension occurs when blood flow through the liver is obstructed
by fibrotic tissue, increasing pressure in the portal vein. This pressure forces blood into
collateral vessels, such as those in the esophagus, causing them to become thin-walled and
dilated. These varices are highly prone to rupture, which constitutes a medical emergency.
4. A patient is diagnosed with Peptic Ulcer Disease (PUD). Which organism is most commonly
associated with the breakdown of the mucosal barrier in this condition?
A. Escherichia coli
B. Helicobacter pylori
C. Clostridium difficile
D. Staphylococcus aureus
Answer: B
Explanation: Helicobacter pylori is a gram-negative bacterium that colonizes the gastric
mucosa and secretes urease to survive the acidic environment. This colonization triggers
an inflammatory response that degrades the protective mucus layer of the stomach.
Without this protection, gastric acid and pepsin cause ulceration of the underlying tissue.
5. Which clinical manifestation is characteristic of Graves’ disease due to the stimulation of
TSH receptors by autoantibodies?
A. Weight gain
B. Myxedema
C. Exophthalmos
D. Bradycardia
Answer: C
Explanation: Graves’ disease is an autoimmune form of hyperthyroidism where antibodies
mimic TSH and overstimulate the thyroid gland. Exophthalmos, or bulging eyes, results
from inflammation and fat accumulation in the retro-orbital space. Other symptoms
include heat intolerance, tachycardia, and weight loss due to a hypermetabolic state.
6. What is the primary underlying cause of Hashimoto’s Thyroiditis?
A. Iodine deficiency
B. Pituitary adenoma
C. Autoimmune destruction of the thyroid gland
D. Excessive intake of thyroid medication
Answer: C
, Explanation: Hashimoto’s Thyroiditis is the most common cause of hypothyroidism in
iodine-sufficient regions. It involves a chronic autoimmune process where lymphocytes
infiltrate and destroy thyroid follicles. This leads to a gradual decline in thyroid hormone
production and a compensatory rise in TSH levels.
7. Which of the following metabolic disturbances is a hallmark of Diabetic Ketoacidosis
(DKA)?
A. Respiratory alkalosis
B. Hypoglycemia
C. Hypernatremia
D. Anion gap metabolic acidosis
Answer: D
Explanation: DKA occurs primarily in Type 1 diabetics when a lack of insulin forces the
body to metabolize fats for energy, producing ketones. The accumulation of acetoacetic and
beta-hydroxybutyric acids leads to a significant drop in blood pH. This results in an
increased anion gap and often triggers Kussmaul respirations as the body attempts to
compensate by blowing off CO2.
8. A patient with Addison’s disease is at risk for an adrenal crisis. What is the metabolic
hallmark of this condition?
A. Hyperglycemia and hypertension
B. Hypernatremia and hypokalemia
C. Hypotension and hyperkalemia
D. Hypoglycemia and hyperkalemia
Answer: C
Explanation: Addison’s disease is characterized by the insufficient production of cortisol
and aldosterone from the adrenal cortex. A lack of aldosterone leads to sodium wasting
(hyponatremia) and potassium retention (hyperkalemia), alongside severe fluid loss. This
combination causes profound hypotension and cardiovascular collapse during an adrenal
crisis.
9. Which clinical feature is most diagnostic of Cushing’s Syndrome?
A. Hyperpigmentation of the skin
B. Central obesity and a ‘buffalo hump’
C. Hypotension
D. Weight loss
Rationale (HSC4558 Exam 3) | University of Central Florida
1. A patient presents with low serum sodium levels, high urine osmolality, and symptoms of
water intoxication. Which condition is most likely responsible for these findings?
A. Hypoparathyroidism
B. Diabetes Insipidus
C. Cushing Syndrome
D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Explanation: SIADH involves the excessive release of ADH, leading to water retention and
dilutional hyponatremia. The kidneys continue to excrete concentrated urine despite low
serum osmolality. This pathophysiology is the opposite of Diabetes Insipidus, where there
is a lack of ADH effect.
2. Which of the following is considered a pre-renal cause of Acute Kidney Injury (AKI)?
A. Acute tubular necrosis
B. Benign prostatic hyperplasia
C. Severe dehydration and hypovolemia
D. Glomerulonephritis
Answer: C
Explanation: Pre-renal AKI is caused by factors that decrease systemic blood flow to the
kidneys, such as hypovolemia or heart failure. This reduction in perfusion leads to a
decreased glomerular filtration rate without initial damage to the parenchyma. In contrast,
intra-renal causes involve direct damage to kidney tissues, while post-renal causes involve
obstruction.
3. In the context of liver cirrhosis, what is the primary pathophysiological mechanism leading
to the development of esophageal varices?
A. Hypoalbuminemia
B. Portal hypertension
C. Increased ammonia levels
D. Decreased clotting factors
,Answer: B
Explanation: Portal hypertension occurs when blood flow through the liver is obstructed
by fibrotic tissue, increasing pressure in the portal vein. This pressure forces blood into
collateral vessels, such as those in the esophagus, causing them to become thin-walled and
dilated. These varices are highly prone to rupture, which constitutes a medical emergency.
4. A patient is diagnosed with Peptic Ulcer Disease (PUD). Which organism is most commonly
associated with the breakdown of the mucosal barrier in this condition?
A. Escherichia coli
B. Helicobacter pylori
C. Clostridium difficile
D. Staphylococcus aureus
Answer: B
Explanation: Helicobacter pylori is a gram-negative bacterium that colonizes the gastric
mucosa and secretes urease to survive the acidic environment. This colonization triggers
an inflammatory response that degrades the protective mucus layer of the stomach.
Without this protection, gastric acid and pepsin cause ulceration of the underlying tissue.
5. Which clinical manifestation is characteristic of Graves’ disease due to the stimulation of
TSH receptors by autoantibodies?
A. Weight gain
B. Myxedema
C. Exophthalmos
D. Bradycardia
Answer: C
Explanation: Graves’ disease is an autoimmune form of hyperthyroidism where antibodies
mimic TSH and overstimulate the thyroid gland. Exophthalmos, or bulging eyes, results
from inflammation and fat accumulation in the retro-orbital space. Other symptoms
include heat intolerance, tachycardia, and weight loss due to a hypermetabolic state.
6. What is the primary underlying cause of Hashimoto’s Thyroiditis?
A. Iodine deficiency
B. Pituitary adenoma
C. Autoimmune destruction of the thyroid gland
D. Excessive intake of thyroid medication
Answer: C
, Explanation: Hashimoto’s Thyroiditis is the most common cause of hypothyroidism in
iodine-sufficient regions. It involves a chronic autoimmune process where lymphocytes
infiltrate and destroy thyroid follicles. This leads to a gradual decline in thyroid hormone
production and a compensatory rise in TSH levels.
7. Which of the following metabolic disturbances is a hallmark of Diabetic Ketoacidosis
(DKA)?
A. Respiratory alkalosis
B. Hypoglycemia
C. Hypernatremia
D. Anion gap metabolic acidosis
Answer: D
Explanation: DKA occurs primarily in Type 1 diabetics when a lack of insulin forces the
body to metabolize fats for energy, producing ketones. The accumulation of acetoacetic and
beta-hydroxybutyric acids leads to a significant drop in blood pH. This results in an
increased anion gap and often triggers Kussmaul respirations as the body attempts to
compensate by blowing off CO2.
8. A patient with Addison’s disease is at risk for an adrenal crisis. What is the metabolic
hallmark of this condition?
A. Hyperglycemia and hypertension
B. Hypernatremia and hypokalemia
C. Hypotension and hyperkalemia
D. Hypoglycemia and hyperkalemia
Answer: C
Explanation: Addison’s disease is characterized by the insufficient production of cortisol
and aldosterone from the adrenal cortex. A lack of aldosterone leads to sodium wasting
(hyponatremia) and potassium retention (hyperkalemia), alongside severe fluid loss. This
combination causes profound hypotension and cardiovascular collapse during an adrenal
crisis.
9. Which clinical feature is most diagnostic of Cushing’s Syndrome?
A. Hyperpigmentation of the skin
B. Central obesity and a ‘buffalo hump’
C. Hypotension
D. Weight loss
