3D's (diarrhea, dementia, dermatitis) are the characteristic of which deficiency disorder?

Appeared in: GMCH Chandigarh - 2022

Explanation

Niacin, also known as Vitamin B3, deficiency is the cause of a systemic disease called Pellagra.
Pellagra is classically characterized by a triad of symptoms known as the "3 D's": Dermatitis, Diarrhea, and Dementia.
The dermatitis is typically photosensitive, appearing on sun-exposed areas, and can form a distinct pattern around the neck known as Casal's necklace.
If left untreated, Pellagra can be fatal, leading to a fourth "D" - Death.

Option A: Thiamine (Vitamin B1) deficiency does not cause the 3 D's of Pellagra.
Option B: Biotin (Vitamin B7) deficiency is rare and does not present with the classic triad of diarrhea, dementia, and dermatitis.
Option D: Riboflavin (Vitamin B2) deficiency does not cause the 3 D's.

Visual 1: Image: A photograph of Casal's necklace, the characteristic photosensitive dermatitis seen in Pellagra, to help visualize one of the key 'D's.
Visual 2: Table: A summary chart comparing the key features of Thiamine, Riboflavin, Niacin, and Biotin deficiencies.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Clinical manifestations of vitamin B complex deficiencies as background academic context rather than a clinical decision trigger.
Nurses must be vigilant in assessing for the 3 D's in at-risk populations, including individuals with alcoholism, malabsorption syndromes (like Crohn's disease), or those on restrictive diets (e.g., maize-based).
Patient education is a key nursing intervention, focusing on dietary diversification and inclusion of niacin-rich foods like meat, fish, legumes, and fortified cereals.
Monitoring for clinical improvement after niacin supplementation is crucial to confirm the diagnosis and ensure effective treatment.

How to Approach the Question

This is a factual recall question that tests your knowledge of vitamin deficiencies.
First, identify the key clinical presentation described in the question stem: the "3 D's" - diarrhea, dementia, and dermatitis.
Recall the classic mnemonics and hallmark signs associated with major vitamin deficiencies.
Connect the "3 D's" triad to the disease Pellagra.
Finally, link Pellagra to its underlying cause, which is a deficiency of Niacin (Vitamin B3).
Review the other options to confirm they are incorrect by recalling their distinct deficiency syndromes (e.g., Thiamine -> Beriberi, Riboflavin -> Ariboflavinosis).

Concept Tested & Keywords

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Practise the full GMCH Chandigarh - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.