A 5-year-old child presents with pallor, lethargy, and learning problems. A blood test shows macrocytic anemia. Which of the following deficiencies is most likely associated with this type of anemia?

1. A

   Riboflavin

2. B

   Cobalamin

3. C

   Niacin

4. D

   Iron

Appeared in: NORCET 7 Prelims -2024

Explanation

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• Cobalamin (Vitamin B12) is essential for DNA synthesis and the maturation of red blood cells in the bone marrow.
• A deficiency impairs this process, leading to the formation of abnormally large red blood cells (macrocytes), a condition known as macrocytic or megaloblastic anemia.
• Vitamin B12 is also crucial for neurological function. Its deficiency can cause neurological symptoms like learning difficulties, memory loss, and sensory deficits, matching the patient's presentation.

Why Other Options Were Wrong

• Option A: Riboflavin (Vitamin B2) deficiency is not a primary cause of macrocytic anemia. It can lead to normocytic anemia (normal-sized red blood cells) and is associated with symptoms like cheilosis and glossitis.
• Option C: Niacin (Vitamin B3) deficiency causes pellagra, which presents with dermatitis, diarrhea, and dementia. It is not associated with macrocytic anemia.
• Option D: Iron deficiency is the most common cause of anemia, but it characteristically causes microcytic, hypochromic anemia (small, pale red blood cells), which is the opposite of macrocytic anemia.

Related Visual

• Visual 1: Diagram: Comparison of red blood cell morphology in microcytic, normocytic, and macrocytic anemia, highlighting the large size of RBCs in the latter.
• Visual 2: Flowchart: Illustrating the metabolic pathway showing how Vitamin B12 and Folate deficiency lead to impaired DNA synthesis and result in megaloblastic anemia.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Association between nutritional deficiencies and types of anemia to guide bedside assessment, documentation, and the next nursing action.
• Differentiating the type of anemia based on RBC indices (like MCV) is a critical nursing assessment skill, as it guides the investigation of the underlying cause and determines the correct treatment.
• It is crucial to identify B12 deficiency as the cause of megaloblastic anemia because treating it with only folic acid can correct the anemia but may worsen or precipitate irreversible neurological damage.
• What if? If the child's blood test showed microcytic anemia instead, the most likely deficiency would be Iron, and the nursing plan would focus on iron supplementation and dietary education about iron-rich foods.

How to Approach the Question

• First, identify the key clinical information provided: a 5-year-old child with general signs of anemia (pallor, lethargy), a neurological symptom (learning problems), and a specific lab finding (macrocytic anemia).
• Focus on the most definitive clue: 'macrocytic anemia'. This term describes the size of the red blood cells and is a direct pointer to the underlying pathophysiology.
• Recall or look up the primary causes of macrocytic anemia. The two most common causes are Vitamin B12 (Cobalamin) and Folic acid deficiency.
• Evaluate the given options against this knowledge. Cobalamin is listed as an option.
• Consider the neurological symptom ('learning problems'). This strongly supports a diagnosis of Vitamin B12 deficiency, as it is well-known to cause neurological complications.
• Eliminate the other options by confirming they cause different types of anemia (e.g., Iron causes microcytic anemia) or different clinical syndromes (e.g., Niacin causes pellagra).

Concept Tested & Keywords

• Concept Tested: Association between nutritional deficiencies and types of anemia
• Stem keywords: 5-year-old child, pallor, lethargy, learning problems, macrocytic anemia
• Lead-in keywords: most likely associated with
• Clinical cues: Macrocytic anemia: This is the key diagnostic finding that points towards specific deficiencies like B12 or folate.
• Clinical cues: Learning problems: This suggests neurological involvement, which is a hallmark of Vitamin B12 deficiency.

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