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Questions and Answers
What is the primary reason for newborn infants, especially premature ones, being more susceptible to methemoglobinemia?
What is the primary reason for newborn infants, especially premature ones, being more susceptible to methemoglobinemia?
- Increased production of MetHb in their blood
- Lower activity of antioxidant proteins in RBCs compared to adults (correct)
- Excessive intake of antioxidants in their diet
- Higher levels of Fe2+ in their blood
What is the characteristic appearance of arterial blood in a case of methemoglobinemia?
What is the characteristic appearance of arterial blood in a case of methemoglobinemia?
- Bright red
- Pale pink
- Dark purple
- Chocolate brown (correct)
How is methemoglobinemia with visible symptoms typically treated?
How is methemoglobinemia with visible symptoms typically treated?
- Oral intake of vitamin C
- Blood transfusion
- Infusion of methylene blue (correct)
- Administration of iron supplements
MetHb is formed when Fe2+ is oxidized to Fe3+ and cannot carry oxygen, leading to a decrease in available oxygen-carrying hemoglobin.
MetHb is formed when Fe2+ is oxidized to Fe3+ and cannot carry oxygen, leading to a decrease in available oxygen-carrying hemoglobin.
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Methemoglobinemia can be a result of nitrate poisoning or toxic reactions to oxidant drugs.
Methemoglobinemia can be a result of nitrate poisoning or toxic reactions to oxidant drugs.
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Proteins in RBCs are 100% as active in newborn infants compared to adults, making newborns equally susceptible to methemoglobinemia.
Proteins in RBCs are 100% as active in newborn infants compared to adults, making newborns equally susceptible to methemoglobinemia.
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Methylene blue is a substance that increases methemoglobin levels in symptomatic cases.
Methylene blue is a substance that increases methemoglobin levels in symptomatic cases.
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