Bitot's Spot is caused by the deficiency of which Vitamin?

UP CHO - 2018

Applied Nutrition & Dietetics

Easy

Appeared in: UP CHO - 2018

Explanation

Bitot's spots are a pathognomonic sign of Vitamin A deficiency.
They are caused by the buildup of keratin and desquamated epithelial cells on the surface of the conjunctiva.
As seen in the image, the spot is typically triangular, with the base towards the edge of the cornea, and has a dry, foamy appearance.
This condition is part of a spectrum of eye disorders called xerophthalmia, which begins with night blindness and can progress to total blindness if untreated.

Option B: Vitamin B complex deficiencies are associated with a wide range of conditions, but not Bitot's spots. For example, Thiamine (B1) deficiency causes Beriberi; Niacin (B3) deficiency causes Pellagra; and Cobalamin (B12) deficiency causes pernicious anemia.
Option C: Vitamin C (Ascorbic acid) deficiency leads to scurvy, which is characterized by impaired collagen synthesis. Symptoms include bleeding gums, perifollicular hemorrhage, poor wound healing, and joint pain. It does not cause Bitot's spots.
Option D: Vitamin B6 (Pyridoxine) deficiency is relatively rare but can cause seborrheic dermatitis, microcytic anemia, glossitis, and neurological symptoms like confusion and seizures. It is not associated with ocular signs like Bitot's spots.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vitamin A deficiency and its ocular manifestations as background academic context rather than a clinical decision trigger.
Nurses play a critical role in identifying early signs of Vitamin A deficiency, especially in pediatric populations in community settings.
In India, the Vitamin A prophylaxis program is a key public health intervention linked with the immunization schedule. Nurses are responsible for administering the doses and educating caregivers.
Patient education on dietary modification is a primary nursing intervention to prevent nutritional deficiencies. Emphasizing locally available, affordable sources of Vitamin A is crucial.

How to Approach the Question

First, analyze the image provided. Identify the key feature: a triangular, white, foamy patch on the conjunctiva.
Recognize this clinical sign as a 'Bitot's Spot'.
Access your knowledge of nutritional deficiencies and their specific clinical manifestations.
Recall the direct link between Bitot's spots and Vitamin A deficiency.
Evaluate the options provided. Select 'Vit-A' as it is the direct cause. Eliminate the other vitamins by recalling their distinct deficiency syndromes (e.g., Vit-C causes scurvy, Vit-B complex causes various other conditions).

Concept Tested & Keywords

Concept Tested: Vitamin A deficiency and its ocular manifestations.
Stem keywords: Bitot's Spot, deficiency, Vitamin
Lead-in keywords: caused by
Clinical cues: The image of a triangular, foamy patch on the conjunctiva is a classic presentation of Bitot's spot.

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