A 55-year-old male underwent total gastrectomy due to peptic ulcer disease. Several months later, he presents with complaints of severe fatigue, dizziness, numbness in the hands and feet, and difficulty walking. On physical examination, he has pale skin, ataxia (unsteady gait), and a smooth, swollen tongue. Laboratory tests reveal macrocytic anemia and low vitamin levels. Which nutritional deficiency is the most likely cause of this condition

1. A

   Vitamin-C

2. B

   Vitamin-D

3. C

   Vitamin-B12

4. D

   Vitamin-H

Appeared in: NORCET-7 Mains-2024

Explanation

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• The patient's history of a total gastrectomy is the most critical piece of information. This surgery removes the stomach's parietal cells, which secrete intrinsic factor.
• Intrinsic factor is essential for the absorption of Vitamin B12 in the terminal ileum. Without it, pernicious anemia develops.
• The presenting symptoms—macrocytic anemia (causing fatigue and pallor), glossitis (smooth, swollen tongue), and neurological deficits (ataxia, numbness)—are hallmark signs of Vitamin B12 deficiency.
• The laboratory finding of macrocytic anemia confirms that the production of red blood cells is impaired, a direct consequence of inadequate B12 for DNA synthesis.

Why Other Options Were Wrong

• Option A: Vitamin C deficiency (scurvy) primarily affects collagen synthesis. Its symptoms include bleeding gums, poor wound healing, and petechiae (small skin hemorrhages). It does not cause macrocytic anemia or the specific neurological symptoms seen in the patient.
• Option B: Vitamin D deficiency affects calcium and bone metabolism. It leads to rickets in children and osteomalacia in adults, characterized by bone pain, muscle weakness, and an increased risk of fractures. It is not associated with macrocytic anemia or glossitis.
• Option D: Vitamin H (Biotin) deficiency is very rare. It typically manifests with dermatological symptoms like hair loss (alopecia) and a scaly red rash, along with some neurological symptoms like depression. It does not cause macrocytic anemia or ataxia.

Related Visual

• Visual 1: Diagram: Illustration of the gastrointestinal tract showing the stomach, parietal cells producing intrinsic factor, and the terminal ileum where the B12-IF complex is absorbed. This would visually explain the mechanism of malabsorption after gastrectomy.
• Visual 2: Flowchart: A flowchart depicting the sequence: Total Gastrectomy -> No Parietal Cells -> No Intrinsic Factor -> Failed B12 Absorption -> B12 Deficiency -> Macrocytic Anemia & Neurological Symptoms.
• Visual 3: Image: A clinical photograph of glossitis, showing a smooth, beefy-red tongue, which is a characteristic sign of B12 deficiency.

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Nutritional deficiencies following total gastrectomy, specifically Vitamin B12 deficiency in acute care settings.
• Nurses must educate patients post-gastrectomy about the lifelong necessity of Vitamin B12 supplementation, which is typically administered via intramuscular injection because the oral route is ineffective.
• Monitoring for neurological changes is critical. Early detection and treatment of B12 deficiency can arrest the progression of neurological damage, but severe, long-standing symptoms like ataxia may not be fully reversible.
• What if the patient had a partial gastrectomy (antrectomy) instead of a total one? While the risk is lower, B12 deficiency can still occur due to reduced intrinsic factor production or bacterial overgrowth in a Billroth II anastomosis, but it would likely develop more slowly.

How to Approach the Question

• First, identify the key elements in the clinical scenario: the patient's surgical history (total gastrectomy), the primary symptoms (fatigue, neurological issues), and the key lab finding (macrocytic anemia).
• Connect the surgical history to its physiological consequences. A total gastrectomy means the entire stomach is gone. What essential function of the stomach is lost?
• Recall or deduce that the stomach produces intrinsic factor, which is necessary for Vitamin B12 absorption.
• Evaluate the patient's symptoms in light of this potential deficiency. Macrocytic anemia and neurological dysfunction are the classic dual presentation of B12 deficiency.
• Review the options. Eliminate those whose deficiency symptoms do not match the patient's presentation (e.g., Vitamin C/scurvy, Vitamin D/bone issues).
• Conclude that Vitamin B12 deficiency is the only option that explains the entire clinical picture, from the root cause (gastrectomy) to the specific hematological and neurological effects.

Concept Tested & Keywords

• Concept Tested: Nutritional deficiencies following total gastrectomy, specifically Vitamin B12 deficiency.
• Stem keywords: total gastrectomy, fatigue, dizziness, numbness, ataxia, smooth, swollen tongue, macrocytic anemia
• Lead-in keywords: most likely cause
• Clinical cues: The history of total gastrectomy is the primary clue, as it directly impacts the absorption pathway for a specific vitamin.
• Clinical cues: The combination of macrocytic anemia and neurological symptoms (ataxia, numbness) is a classic presentation of B12 deficiency.

Question ID

QM3pPu7B2yI9ST6CxiRCoi

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