The possible reason(s) for cyanosis, one of congenital heart disease is:
Correct answer: A. Formation of carboxy-hemoglobin
- A. Formation of carboxy-hemoglobin
- B. The high concentration of oxyhemoglobin
- C. Low level of carbon monoxide (CO)
- D. Low level of hemoglobin
Explanation
The correct answer is the formation of carboxy-hemoglobin. This occurs when carbon monoxide binds to hemoglobin with a much higher affinity than oxygen, preventing adequate oxygen transport in the blood, leading to cyanosis. Option B is incorrect because a high concentration of oxyhemoglobin suggests well-oxygenated blood. Option C is incorrect because low levels of CO do not contribute to cyanosis. Option D is incorrect as low hemoglobin levels lead to anemia, not cyanosis.
This question appeared on the ETEA MDCAT 2019 paper, which you can sit online with every answer explained.
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