1. Question:
A 45-year-old woman presents with fatigue, weight gain, and cold
intolerance. Lab results show elevated TSH and low free T4 levels.
Which condition is most likely responsible for these findings?
A) Hyperthyroidism
B) Hypothyroidism
C) Addison’s disease
D) Diabetes mellitus
Answer: B) Hypothyroidism
Rationale:
The patient’s symptoms (fatigue, weight gain, cold intolerance) and lab
findings (elevated TSH, low free T4) suggest hypothyroidism. In
hypothyroidism, the thyroid gland does not produce enough thyroid
hormone, leading to an increase in TSH secretion due to a
compensatory mechanism.
2. Question:
A 60-year-old man with a history of hypertension and smoking presents
with sudden onset of severe chest pain radiating to the back. His blood
pressure is 210/130 mmHg. What is the most likely diagnosis?
A) Acute myocardial infarction
B) Pulmonary embolism
C) Aortic dissection
D) Pneumothorax
Answer: C) Aortic dissection
,Rationale:
The patient’s history of hypertension, smoking, and sudden onset of
severe chest pain radiating to the back suggests aortic dissection. This
condition occurs when there is a tear in the inner layer of the aorta,
causing blood to flow between the layers of the vessel wall. The
elevated blood pressure is a contributing factor.
3. Question:
Which of the following mechanisms contributes to the development of
metabolic acidosis in diabetic ketoacidosis (DKA)?
A) Decreased renal function
B) Excessive bicarbonate loss in the urine
C) Accumulation of ketone bodies
D) Increased lactic acid production
Answer: C) Accumulation of ketone bodies
Rationale:
In diabetic ketoacidosis (DKA), the body breaks down fatty acids for
energy due to a lack of insulin. This process results in the production of
ketone bodies (acetoacetate, beta-hydroxybutyrate), which are acidic
and accumulate in the blood, leading to metabolic acidosis.
4. Question:
A patient with chronic obstructive pulmonary disease (COPD) is
experiencing increasing shortness of breath and decreased oxygen
saturation. What is the most likely cause of the hypoxemia in this
patient?
,A) Pulmonary embolism
B) V/Q mismatch
C) Anemia
D) Increased metabolic rate
Answer: B) V/Q mismatch
Rationale:
In COPD, the destruction of alveolar walls leads to ventilation/perfusion
(V/Q) mismatching. This results in areas of the lungs being ventilated
but not perfused (or vice versa), impairing gas exchange and causing
hypoxemia.
5. Question:
A 30-year-old woman with a history of multiple miscarriages is
diagnosed with antiphospholipid syndrome. Which of the following is
the primary pathophysiologic mechanism in this disorder?
A) Antibodies against cell surface receptors, leading to cellular
apoptosis
B) Formation of autoantibodies that increase blood clotting
C) Decreased clearance of circulating immune complexes
D) Inflammation of small blood vessels
Answer: B) Formation of autoantibodies that increase blood clotting
Rationale:
Antiphospholipid syndrome is characterized by the presence of
antiphospholipid antibodies that bind to phospholipids on cell
membranes, leading to increased coagulation and a higher risk of
thrombosis. This can cause recurrent miscarriages, deep vein
thrombosis, and other clotting disorders.
, 6. Question:
A patient with cirrhosis develops ascites. Which of the following
mechanisms is most responsible for the development of ascites in liver
cirrhosis?
A) Decreased renal perfusion
B) Increased hydrostatic pressure in the hepatic vasculature
C) Decreased protein synthesis in the liver
D) Increased secretion of aldosterone
Answer: B) Increased hydrostatic pressure in the hepatic vasculature
Rationale:
In cirrhosis, liver damage leads to increased resistance to blood flow in
the hepatic vasculature, causing elevated hydrostatic pressure in the
portal vein (portal hypertension). This increased pressure leads to fluid
leakage into the abdominal cavity, resulting in ascites.
7. Question:
A 25-year-old male presents with a history of chronic fatigue, muscle
weakness, and cramping. Blood tests reveal low sodium and high
potassium levels. His EKG shows peaked T waves. Which condition is
most likely?
A) Primary hyperaldosteronism
B) Addison’s disease
C) Cushing’s syndrome
D) Hyperparathyroidism
Answer: B) Addison’s disease
A 45-year-old woman presents with fatigue, weight gain, and cold
intolerance. Lab results show elevated TSH and low free T4 levels.
Which condition is most likely responsible for these findings?
A) Hyperthyroidism
B) Hypothyroidism
C) Addison’s disease
D) Diabetes mellitus
Answer: B) Hypothyroidism
Rationale:
The patient’s symptoms (fatigue, weight gain, cold intolerance) and lab
findings (elevated TSH, low free T4) suggest hypothyroidism. In
hypothyroidism, the thyroid gland does not produce enough thyroid
hormone, leading to an increase in TSH secretion due to a
compensatory mechanism.
2. Question:
A 60-year-old man with a history of hypertension and smoking presents
with sudden onset of severe chest pain radiating to the back. His blood
pressure is 210/130 mmHg. What is the most likely diagnosis?
A) Acute myocardial infarction
B) Pulmonary embolism
C) Aortic dissection
D) Pneumothorax
Answer: C) Aortic dissection
,Rationale:
The patient’s history of hypertension, smoking, and sudden onset of
severe chest pain radiating to the back suggests aortic dissection. This
condition occurs when there is a tear in the inner layer of the aorta,
causing blood to flow between the layers of the vessel wall. The
elevated blood pressure is a contributing factor.
3. Question:
Which of the following mechanisms contributes to the development of
metabolic acidosis in diabetic ketoacidosis (DKA)?
A) Decreased renal function
B) Excessive bicarbonate loss in the urine
C) Accumulation of ketone bodies
D) Increased lactic acid production
Answer: C) Accumulation of ketone bodies
Rationale:
In diabetic ketoacidosis (DKA), the body breaks down fatty acids for
energy due to a lack of insulin. This process results in the production of
ketone bodies (acetoacetate, beta-hydroxybutyrate), which are acidic
and accumulate in the blood, leading to metabolic acidosis.
4. Question:
A patient with chronic obstructive pulmonary disease (COPD) is
experiencing increasing shortness of breath and decreased oxygen
saturation. What is the most likely cause of the hypoxemia in this
patient?
,A) Pulmonary embolism
B) V/Q mismatch
C) Anemia
D) Increased metabolic rate
Answer: B) V/Q mismatch
Rationale:
In COPD, the destruction of alveolar walls leads to ventilation/perfusion
(V/Q) mismatching. This results in areas of the lungs being ventilated
but not perfused (or vice versa), impairing gas exchange and causing
hypoxemia.
5. Question:
A 30-year-old woman with a history of multiple miscarriages is
diagnosed with antiphospholipid syndrome. Which of the following is
the primary pathophysiologic mechanism in this disorder?
A) Antibodies against cell surface receptors, leading to cellular
apoptosis
B) Formation of autoantibodies that increase blood clotting
C) Decreased clearance of circulating immune complexes
D) Inflammation of small blood vessels
Answer: B) Formation of autoantibodies that increase blood clotting
Rationale:
Antiphospholipid syndrome is characterized by the presence of
antiphospholipid antibodies that bind to phospholipids on cell
membranes, leading to increased coagulation and a higher risk of
thrombosis. This can cause recurrent miscarriages, deep vein
thrombosis, and other clotting disorders.
, 6. Question:
A patient with cirrhosis develops ascites. Which of the following
mechanisms is most responsible for the development of ascites in liver
cirrhosis?
A) Decreased renal perfusion
B) Increased hydrostatic pressure in the hepatic vasculature
C) Decreased protein synthesis in the liver
D) Increased secretion of aldosterone
Answer: B) Increased hydrostatic pressure in the hepatic vasculature
Rationale:
In cirrhosis, liver damage leads to increased resistance to blood flow in
the hepatic vasculature, causing elevated hydrostatic pressure in the
portal vein (portal hypertension). This increased pressure leads to fluid
leakage into the abdominal cavity, resulting in ascites.
7. Question:
A 25-year-old male presents with a history of chronic fatigue, muscle
weakness, and cramping. Blood tests reveal low sodium and high
potassium levels. His EKG shows peaked T waves. Which condition is
most likely?
A) Primary hyperaldosteronism
B) Addison’s disease
C) Cushing’s syndrome
D) Hyperparathyroidism
Answer: B) Addison’s disease
