Which statement related to Pellagra is correct?

Appeared in: Raj. CHO -2024

Explanation

Pellagra is a disease caused by a deficiency of niacin (vitamin B3) or its precursor, tryptophan.
It is strongly associated with populations that subsist on a diet primarily composed of maize (corn).
Maize is a poor source of available niacin because the vitamin is present in a bound, non-absorbable form called niacytin.
Additionally, maize protein is deficient in the amino acid tryptophan, which the body can otherwise use to synthesize niacin.

Option A: Pellagra's primary manifestations are dermatological, gastrointestinal, and neurological (the '4 Ds'). It does not directly cause an increased risk of heart attacks.
Option B: Pellagra is caused by niacin (vitamin B3) deficiency. Pyridoxine is vitamin B6.
Option D: 'Saridhi' is not a recognized medical symptom of Pellagra.

Visual 1: Image - A picture showing Casal's necklace, the characteristic hyperpigmented rash around the neck in a patient with pellagra. This helps visualize the 'Dermatitis' component of the 4 Ds.
Visual 2: Diagram - A flowchart illustrating the metabolic pathway from tryptophan to niacin, highlighting the block that occurs in a maize-based diet and the role of other vitamins like B2 and B6 as cofactors.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology and clinical features of Pellagra (Niacin Deficiency) as background academic context rather than a clinical decision trigger.
A thorough dietary history is crucial for any patient presenting with unexplained dermatitis, diarrhea, or cognitive changes, especially in at-risk populations (e.g., alcoholics, those with malabsorptive disorders, or individuals on restrictive diets).
Pellagra is a treatable condition. Early recognition and treatment with nicotinamide can prevent irreversible neurological damage and death.
What if? If a patient presents with similar symptoms but their staple food is polished rice instead of maize, the primary suspicion should shift towards Thiamine (Vitamin B1) deficiency (Beri-Beri), which also presents with neurological and systemic symptoms but has a different underlying cause.

How to Approach the Question

First, identify the core concept of the question, which is 'Pellagra'.
Recall the key facts about Pellagra: it's a Niacin (Vitamin B3) deficiency.
Remember the classic mnemonic '4 Ds' for its symptoms: Dermatitis, Diarrhea, Dementia, Death.
Think about the primary cause, which is often dietary. Recall the link between Pellagra and maize-based diets.
Evaluate each option based on these facts:
Option A (heart attack): This is not a primary feature of Pellagra.

Concept Tested & Keywords

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Practise the full Raj. CHO -2024

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