NURS 6501 ADVANCED PATHOPHYSIOLOGY
MIDTERM EXAM LATEST 2026 UPDATE 100+
QUESTIONS AND DETAILED VERIFIED ANSWERS
FROM ACTUAL EXAMS TEST GRADE A+
Question 1
A 55-year-old male with a history of hypertension presents with sudden onset of
severe chest pain radiating to his back. Aortic dissection is suspected. Which of
the following pathophysiological mechanisms is most directly responsible for this
condition?
A) Atherosclerotic plaque rupture with thrombus formation
B) Cystic medial degeneration of the aortic wall
C) Vasospasm of the coronary arteries
D) Inflammation of the pericardial layers
Correct Answer: B
Explanation: Cystic medial degeneration weakens the tunica media, allowing an
intimal tear and propagation of a false lumen in aortic dissection. Atherosclerotic
plaque rupture leads to myocardial infarction, not dissection. Vasospasm causes
Prinzmetal angina. Pericardial inflammation causes pericarditis, not dissection.
Question 2
A 30-year-old female presents with fatigue, weight gain, and cold intolerance.
Laboratory findings reveal elevated TSH and low free T4. What is the most likely
diagnosis?
A) Graves’ disease
B) Hashimoto thyroiditis
,C) Toxic multinodular goiter
D) Subacute thyroiditis
Correct Answer: B
Explanation: Hashimoto thyroiditis is an autoimmune destruction of thyroid tissue,
leading to primary hypothyroidism (high TSH, low T4). Graves’ disease causes
hyperthyroidism (low TSH, high T4). Toxic multinodular goiter causes
hyperthyroidism. Subacute thyroiditis causes transient hyperthyroidism then
hypothyroidism.
Question 3
A 65-year-old male with chronic obstructive pulmonary disease (COPD) has
worsening dyspnea and peripheral edema. His ABG shows pH 7.32, PaCO2 68
mmHg, HCO3- 34 mEq/L. Which condition is most consistent with these findings?
A) Acute respiratory acidosis
B) Chronic respiratory acidosis with metabolic compensation
C) Metabolic alkalosis with respiratory compensation
D) Mixed metabolic acidosis and respiratory acidosis
Correct Answer: B
*Explanation: Elevated PaCO2 indicates respiratory acidosis; elevated HCO3-
indicates metabolic compensation. Chronicity is suggested by near-normal pH
despite high PaCO2. Acute respiratory acidosis would have a normal or only
slightly elevated HCO3-. Metabolic alkalosis would have high HCO3- and low
PaCO2. Mixed disorder would have a more abnormal pH.*
Question 4
A 45-year-old woman presents with episodic flushing, diarrhea, and wheezing. A
liver biopsy reveals metastatic neuroendocrine tumor. Which substance is most
likely responsible for her symptoms?
A) Insulin
,B) Serotonin
C) Glucagon
D) Somatostatin
Correct Answer: B
Explanation: Carcinoid syndrome (flushing, diarrhea, wheezing) is caused by
serotonin and other vasoactive substances from neuroendocrine tumors. Insulin
causes hypoglycemia. Glucagon causes hyperglycemia and rash. Somatostatin
inhibits hormone release.
Question 5
A 10-year-old boy presents with recurrent epistaxis, gum bleeding, and easy
bruising. Platelet count is 20,000/μL. Bone marrow shows increased
megakaryocytes. What is the most likely diagnosis?
A) Aplastic anemia
B) Hemophilia A
C) Immune thrombocytopenic purpura (ITP)
D) Disseminated intravascular coagulation (DIC)
Correct Answer: C
Explanation: ITP presents with isolated thrombocytopenia, normal marrow with
increased megakaryocytes, and no other cytopenias. Aplastic anemia shows
pancytopenia with fatty marrow. Hemophilia A has normal platelet count but
prolonged PTT. DIC shows microangiopathic changes and consumption of clotting
factors.
Question 6
A 70-year-old male with a history of atrial fibrillation presents with sudden onset
of left leg pain, pallor, and pulselessness. What is the most likely source of the
embolus?
A) Left ventricle
, B) Right atrium
C) Left atrial appendage
D) Aortic arch atheroma
Correct Answer: C
Explanation: In atrial fibrillation, thrombi form in the left atrial appendage and
embolize systemically. Left ventricle is source in myocardial infarction. Right atrium
emboli go to lungs. Aortic arch atheroma can embolize but less common than
atrial fibrillation source.
Question 7
A newborn is noted to have respiratory distress, cyanosis, and absent breath
sounds on the left side. Chest x-ray shows a hyperlucent left hemithorax with
mediastinal shift to the right. What is the most likely diagnosis?
A) Congenital diaphragmatic hernia
B) Tension pneumothorax
C) Meconium aspiration syndrome
D) Transient tachypnea of the newborn
Correct Answer: B
Explanation: Tension pneumothorax presents with respiratory distress, absent
breath sounds, hyperlucent hemithorax, and mediastinal shift away from affected
side. Congenital diaphragmatic hernia shows bowel loops in chest. Meconium
aspiration shows patchy infiltrates. Transient tachypnea has no mediastinal shift.
Question 8
A 50-year-old female with systemic lupus erythematosus (SLE) develops
proteinuria, hematuria, and hypertension. Renal biopsy shows diffuse proliferative
glomerulonephritis. Which classification is this?
A) Class I
B) Class II
MIDTERM EXAM LATEST 2026 UPDATE 100+
QUESTIONS AND DETAILED VERIFIED ANSWERS
FROM ACTUAL EXAMS TEST GRADE A+
Question 1
A 55-year-old male with a history of hypertension presents with sudden onset of
severe chest pain radiating to his back. Aortic dissection is suspected. Which of
the following pathophysiological mechanisms is most directly responsible for this
condition?
A) Atherosclerotic plaque rupture with thrombus formation
B) Cystic medial degeneration of the aortic wall
C) Vasospasm of the coronary arteries
D) Inflammation of the pericardial layers
Correct Answer: B
Explanation: Cystic medial degeneration weakens the tunica media, allowing an
intimal tear and propagation of a false lumen in aortic dissection. Atherosclerotic
plaque rupture leads to myocardial infarction, not dissection. Vasospasm causes
Prinzmetal angina. Pericardial inflammation causes pericarditis, not dissection.
Question 2
A 30-year-old female presents with fatigue, weight gain, and cold intolerance.
Laboratory findings reveal elevated TSH and low free T4. What is the most likely
diagnosis?
A) Graves’ disease
B) Hashimoto thyroiditis
,C) Toxic multinodular goiter
D) Subacute thyroiditis
Correct Answer: B
Explanation: Hashimoto thyroiditis is an autoimmune destruction of thyroid tissue,
leading to primary hypothyroidism (high TSH, low T4). Graves’ disease causes
hyperthyroidism (low TSH, high T4). Toxic multinodular goiter causes
hyperthyroidism. Subacute thyroiditis causes transient hyperthyroidism then
hypothyroidism.
Question 3
A 65-year-old male with chronic obstructive pulmonary disease (COPD) has
worsening dyspnea and peripheral edema. His ABG shows pH 7.32, PaCO2 68
mmHg, HCO3- 34 mEq/L. Which condition is most consistent with these findings?
A) Acute respiratory acidosis
B) Chronic respiratory acidosis with metabolic compensation
C) Metabolic alkalosis with respiratory compensation
D) Mixed metabolic acidosis and respiratory acidosis
Correct Answer: B
*Explanation: Elevated PaCO2 indicates respiratory acidosis; elevated HCO3-
indicates metabolic compensation. Chronicity is suggested by near-normal pH
despite high PaCO2. Acute respiratory acidosis would have a normal or only
slightly elevated HCO3-. Metabolic alkalosis would have high HCO3- and low
PaCO2. Mixed disorder would have a more abnormal pH.*
Question 4
A 45-year-old woman presents with episodic flushing, diarrhea, and wheezing. A
liver biopsy reveals metastatic neuroendocrine tumor. Which substance is most
likely responsible for her symptoms?
A) Insulin
,B) Serotonin
C) Glucagon
D) Somatostatin
Correct Answer: B
Explanation: Carcinoid syndrome (flushing, diarrhea, wheezing) is caused by
serotonin and other vasoactive substances from neuroendocrine tumors. Insulin
causes hypoglycemia. Glucagon causes hyperglycemia and rash. Somatostatin
inhibits hormone release.
Question 5
A 10-year-old boy presents with recurrent epistaxis, gum bleeding, and easy
bruising. Platelet count is 20,000/μL. Bone marrow shows increased
megakaryocytes. What is the most likely diagnosis?
A) Aplastic anemia
B) Hemophilia A
C) Immune thrombocytopenic purpura (ITP)
D) Disseminated intravascular coagulation (DIC)
Correct Answer: C
Explanation: ITP presents with isolated thrombocytopenia, normal marrow with
increased megakaryocytes, and no other cytopenias. Aplastic anemia shows
pancytopenia with fatty marrow. Hemophilia A has normal platelet count but
prolonged PTT. DIC shows microangiopathic changes and consumption of clotting
factors.
Question 6
A 70-year-old male with a history of atrial fibrillation presents with sudden onset
of left leg pain, pallor, and pulselessness. What is the most likely source of the
embolus?
A) Left ventricle
, B) Right atrium
C) Left atrial appendage
D) Aortic arch atheroma
Correct Answer: C
Explanation: In atrial fibrillation, thrombi form in the left atrial appendage and
embolize systemically. Left ventricle is source in myocardial infarction. Right atrium
emboli go to lungs. Aortic arch atheroma can embolize but less common than
atrial fibrillation source.
Question 7
A newborn is noted to have respiratory distress, cyanosis, and absent breath
sounds on the left side. Chest x-ray shows a hyperlucent left hemithorax with
mediastinal shift to the right. What is the most likely diagnosis?
A) Congenital diaphragmatic hernia
B) Tension pneumothorax
C) Meconium aspiration syndrome
D) Transient tachypnea of the newborn
Correct Answer: B
Explanation: Tension pneumothorax presents with respiratory distress, absent
breath sounds, hyperlucent hemithorax, and mediastinal shift away from affected
side. Congenital diaphragmatic hernia shows bowel loops in chest. Meconium
aspiration shows patchy infiltrates. Transient tachypnea has no mediastinal shift.
Question 8
A 50-year-old female with systemic lupus erythematosus (SLE) develops
proteinuria, hematuria, and hypertension. Renal biopsy shows diffuse proliferative
glomerulonephritis. Which classification is this?
A) Class I
B) Class II
