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Question 1

Q1:
Which of the following is the first-line treatment for severe methemoglobinemia?
A) Oxygen therapy
B) Methylene blue
C) Vitamin C
D) Sodium bicarbonate
E) High-dose corticosteroids

Answer 1

B) Methylene blue

Question 2

Q2:
Which of the following clinical signs is most commonly associated with methemoglobinemia?
A) Respiratory alkalosis
B) Chocolate-brown colored blood
C) Hyperkalemia
D) Asterixis
E) Jaundice

Answer 2

Answer: B) Chocolate-brown colored blood

Question 3

Q3:
Which of the following is a known risk factor for developing congenital methemoglobinemia?
A) Deficiency of glucose-6-phosphate dehydrogenase
B) Inherited hemoglobinopathies
C) Reduced NADH-methemoglobin reductase activity
D) High dietary nitrite intake
E) Vitamin C deficiency

Answer 3

C) Reduced NADH-methemoglobin reductase activity

Question 4

Q4
A 3-month-old infant is brought to the clinic with signs of persistent cyanosis. The child’s blood appears chocolate-brown in color, and pulse oximetry readings are abnormally low despite supplemental oxygen. Which of the following is most likely responsible for this presentation?
A) Congenital methemoglobinemia
B) Viral pneumonia
C) Bronchiolitis
D) Tetralogy of Fallot
E) Respiratory distress syndrome

Answer 4

Answer: A) Congenital methemoglobinemia

Question 5

Q5:
In patients with methemoglobinemia, pulse oximeters tend to:
A) Underestimate oxygen saturation
B) Overestimate oxygen saturation
C) Accurately measure oxygen saturation
D) Fail to detect low oxygen levels
E) Report a normal oxygen saturation even in severe cases

Answer 5

Answer: B) Overestimate oxygen saturation