NUR 502 Exam 3: Advanced Pathophysiology -
St. Thomas University Updated and Latest
Questions and Correct Answers with Rationale
1. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which laboratory finding is most consistent with this condition?
A. Serum osmolality of 310 mOsm/kg
B. Serum sodium of 125 mEq/L
C. Urine specific gravity of 1.001
D. Hypernatremia and dehydration
Correct Answer: B
Rationale: SIADH results in excessive water reabsorption by the kidneys due to high levels
of ADH. This pathological process leads to dilutional hyponatremia and decreased serum
osmolality. Patients typically present with concentrated urine despite having fluid overload
in the intravascular space. The serum sodium level of 125 mEq/L clearly indicates
significant hyponatremia. Understanding this electrolyte imbalance is essential for
managing neurological risks in these patients.
2. Which mechanism best describes the development of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Increased glucose production by the liver
C. Autoimmune destruction of pancreatic beta cells
D. Chronic overconsumption of simple carbohydrates
Correct Answer: C
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute deficiency of insulin
production. This occurs because the immune system mistakenly attacks and destroys the
insulin-producing beta cells in the Islets of Langerhans. Genetic predisposition combined
with an environmental trigger is often hypothesized to initiate this autoimmune response.
Without insulin, glucose cannot enter cells for energy, leading to hyperglycemia and
ketoacidosis. This disease differs significantly from Type 2, which involves cellular
resistance to insulin.
3. A patient with Chronic Kidney Disease (CKD) presents with severe anemia. What is the
primary pathophysiological cause?
A. Chronic blood loss during hemodialysis
B. Inadequate intake of dietary iron
,C. Inadequate production of erythropoietin by the kidneys
D. Premature destruction of red blood cells
Correct Answer: C
Rationale: The kidneys play a vital role in hematology by secreting the hormone
erythropoietin. In advanced CKD, the renal peritubular cells are damaged and cannot
produce sufficient erythropoietin to stimulate the bone marrow. This lack of stimulation
results in a decrease in the production of red blood cells. Patients consequently develop
normochromic, normocytic anemia as renal function declines. Management often involves
the administration of synthetic erythropoiesis-stimulating agents.
4. What is the hallmark clinical manifestation of Nephrotic Syndrome?
A. Gross hematuria and hypertension
B. Elevated serum albumin levels
C. Increased glomerular filtration rate
D. Massive proteinuria exceeding 3.5g per day
Correct Answer: D
Rationale: Nephrotic syndrome is a clinical complex characterized by a significant increase
in glomerular permeability. The most defining feature is the loss of massive amounts of
protein into the urine. This loss leads to hypoalbuminemia, which reduces plasma oncotic
pressure and causes generalized edema. Hyperlipidemia also occurs as the liver increases
lipid synthesis to compensate for protein loss. Differentiation from nephritic syndrome is
critical as the latter focuses more on inflammation and hematuria.
5. Which condition is characterized by a ‘skip lesions’ pattern and transmural inflammation of
the bowel wall?
A. Ulcerative Colitis
B. Diverticulitis
C. Crohn’s Disease
D. Irritable Bowel Syndrome
Correct Answer: C
Rationale: Crohn’s disease is an idiopathic inflammatory bowel disorder that can affect
any part of the GI tract. Its pathology is unique because it involves skip lesions, where
healthy tissue is interspersed with diseased areas. The inflammation is transmural,
meaning it affects all layers of the intestinal wall. This full-thickness involvement often
leads to complications like fistulas and strictures. In contrast, ulcerative colitis is usually
limited to the mucosa of the colon and rectum.
, 6. A patient presents with tachycardia, weight loss, and exophthalmos. Which condition is
most likely?
A. Hashimoto’s Thyroiditis
B. Myxedema
C. Graves’ Disease
D. Cushing’s Syndrome
Correct Answer: C
Rationale: Graves’ disease is an autoimmune disorder that is the most common cause of
hyperthyroidism. Thyroid-stimulating immunoglobulins (TSI) mimic TSH and bind to
receptors, causing the overproduction of thyroid hormones. The clinical triad usually
includes hypermetabolism, goiter, and exophthalmos (bulging eyes). Exophthalmos occurs
due to inflammation and accumulation of connective tissue behind the orbits. Recognizing
these systemic manifestations is key to diagnosing thyrotoxicosis early.
7. Hepatic encephalopathy is primarily caused by the accumulation of which substance in the
blood?
A. Bilirubin
B. Ammonia
C. Albumin
D. Urea
Correct Answer: B
Rationale: When the liver is severely damaged, it can no longer convert ammonia into urea
for excretion. Ammonia is a byproduct of protein metabolism and is highly neurotoxic. As
levels rise, it crosses the blood-brain barrier and impairs neuronal function. This lead to
symptoms ranging from mild confusion to asterixis and eventually coma. Lactulose is
frequently used in treatment to help eliminate ammonia via the gut.
8. In the context of Acute Kidney Injury (AKI), which of the following is considered a prerenal
cause?
A. Acute tubular necrosis from nephrotoxins
B. Hypovolemic shock due to hemorrhage
C. Prostatic hypertrophy causing obstruction
D. Glomerulonephritis
Correct Answer: B
St. Thomas University Updated and Latest
Questions and Correct Answers with Rationale
1. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which laboratory finding is most consistent with this condition?
A. Serum osmolality of 310 mOsm/kg
B. Serum sodium of 125 mEq/L
C. Urine specific gravity of 1.001
D. Hypernatremia and dehydration
Correct Answer: B
Rationale: SIADH results in excessive water reabsorption by the kidneys due to high levels
of ADH. This pathological process leads to dilutional hyponatremia and decreased serum
osmolality. Patients typically present with concentrated urine despite having fluid overload
in the intravascular space. The serum sodium level of 125 mEq/L clearly indicates
significant hyponatremia. Understanding this electrolyte imbalance is essential for
managing neurological risks in these patients.
2. Which mechanism best describes the development of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Increased glucose production by the liver
C. Autoimmune destruction of pancreatic beta cells
D. Chronic overconsumption of simple carbohydrates
Correct Answer: C
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute deficiency of insulin
production. This occurs because the immune system mistakenly attacks and destroys the
insulin-producing beta cells in the Islets of Langerhans. Genetic predisposition combined
with an environmental trigger is often hypothesized to initiate this autoimmune response.
Without insulin, glucose cannot enter cells for energy, leading to hyperglycemia and
ketoacidosis. This disease differs significantly from Type 2, which involves cellular
resistance to insulin.
3. A patient with Chronic Kidney Disease (CKD) presents with severe anemia. What is the
primary pathophysiological cause?
A. Chronic blood loss during hemodialysis
B. Inadequate intake of dietary iron
,C. Inadequate production of erythropoietin by the kidneys
D. Premature destruction of red blood cells
Correct Answer: C
Rationale: The kidneys play a vital role in hematology by secreting the hormone
erythropoietin. In advanced CKD, the renal peritubular cells are damaged and cannot
produce sufficient erythropoietin to stimulate the bone marrow. This lack of stimulation
results in a decrease in the production of red blood cells. Patients consequently develop
normochromic, normocytic anemia as renal function declines. Management often involves
the administration of synthetic erythropoiesis-stimulating agents.
4. What is the hallmark clinical manifestation of Nephrotic Syndrome?
A. Gross hematuria and hypertension
B. Elevated serum albumin levels
C. Increased glomerular filtration rate
D. Massive proteinuria exceeding 3.5g per day
Correct Answer: D
Rationale: Nephrotic syndrome is a clinical complex characterized by a significant increase
in glomerular permeability. The most defining feature is the loss of massive amounts of
protein into the urine. This loss leads to hypoalbuminemia, which reduces plasma oncotic
pressure and causes generalized edema. Hyperlipidemia also occurs as the liver increases
lipid synthesis to compensate for protein loss. Differentiation from nephritic syndrome is
critical as the latter focuses more on inflammation and hematuria.
5. Which condition is characterized by a ‘skip lesions’ pattern and transmural inflammation of
the bowel wall?
A. Ulcerative Colitis
B. Diverticulitis
C. Crohn’s Disease
D. Irritable Bowel Syndrome
Correct Answer: C
Rationale: Crohn’s disease is an idiopathic inflammatory bowel disorder that can affect
any part of the GI tract. Its pathology is unique because it involves skip lesions, where
healthy tissue is interspersed with diseased areas. The inflammation is transmural,
meaning it affects all layers of the intestinal wall. This full-thickness involvement often
leads to complications like fistulas and strictures. In contrast, ulcerative colitis is usually
limited to the mucosa of the colon and rectum.
, 6. A patient presents with tachycardia, weight loss, and exophthalmos. Which condition is
most likely?
A. Hashimoto’s Thyroiditis
B. Myxedema
C. Graves’ Disease
D. Cushing’s Syndrome
Correct Answer: C
Rationale: Graves’ disease is an autoimmune disorder that is the most common cause of
hyperthyroidism. Thyroid-stimulating immunoglobulins (TSI) mimic TSH and bind to
receptors, causing the overproduction of thyroid hormones. The clinical triad usually
includes hypermetabolism, goiter, and exophthalmos (bulging eyes). Exophthalmos occurs
due to inflammation and accumulation of connective tissue behind the orbits. Recognizing
these systemic manifestations is key to diagnosing thyrotoxicosis early.
7. Hepatic encephalopathy is primarily caused by the accumulation of which substance in the
blood?
A. Bilirubin
B. Ammonia
C. Albumin
D. Urea
Correct Answer: B
Rationale: When the liver is severely damaged, it can no longer convert ammonia into urea
for excretion. Ammonia is a byproduct of protein metabolism and is highly neurotoxic. As
levels rise, it crosses the blood-brain barrier and impairs neuronal function. This lead to
symptoms ranging from mild confusion to asterixis and eventually coma. Lactulose is
frequently used in treatment to help eliminate ammonia via the gut.
8. In the context of Acute Kidney Injury (AKI), which of the following is considered a prerenal
cause?
A. Acute tubular necrosis from nephrotoxins
B. Hypovolemic shock due to hemorrhage
C. Prostatic hypertrophy causing obstruction
D. Glomerulonephritis
Correct Answer: B
