Bitot spot is occurring due to the deficiency of?

ESIC Nursing Officer 2016 (Shift -2)

Applied Nutrition & Dietetics

Easy

Appeared in: ESIC Nursing Officer 2016 (Shift -2)

Explanation

Bitot's spots are a hallmark sign of Vitamin A deficiency.
They appear as triangular, foamy, whitish-yellow patches on the conjunctiva (the white part of the eye).
The spots are caused by the keratinization of the conjunctival epithelium due to a lack of Vitamin A.
This condition is a part of xerophthalmia, a spectrum of eye diseases caused by severe Vitamin A deficiency, which can lead to blindness if untreated.

Option B: Vitamin B deficiency does not cause Bitot's spots. Deficiencies in different B vitamins lead to other conditions.
Option C: Vitamin C deficiency causes Scurvy, which is characterized by issues with collagen synthesis, leading to bleeding gums, poor wound healing, and hemorrhages, not Bitot's spots.
Option D: Vitamin D deficiency affects bone health by impairing calcium absorption.

Visual 1: Clinical Photograph - A close-up image of an eye clearly showing a triangular, foamy Bitot's spot on the temporal conjunctiva. This helps in recognizing the specific clinical sign.
Visual 2: Diagram - A flowchart illustrating the progression of xerophthalmia, starting from night blindness, moving to conjunctival xerosis and Bitot's spots, and ending in corneal ulceration and keratomalacia. This visualizes the stages of the disease.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vitamin Deficiencies and Associated Diseases as background academic context rather than a clinical decision trigger.
Early recognition of Bitot's spots by a nurse, especially in pediatric or community health settings, is critical for preventing irreversible blindness. It is a key indicator for initiating high-dose Vitamin A supplementation.
In India, Vitamin A deficiency is a significant public health problem, particularly among preschool children. The National Programme for Prevention and Control of Blindness includes prophylactic administration of Vitamin A to children.
What if? If a patient with Bitot's spots also has severe protein-energy malnutrition (PEM), the treatment must address both. In PEM, the liver cannot produce enough retinol-binding protein (RBP) to transport Vitamin A from liver stores to the tissues, making the deficiency functionally worse. Therefore, nutritional rehabilitation for PEM is essential alongside Vitamin A supplementation.

How to Approach the Question

First, identify the key term in the question: 'Bitot spot'.
This is a factual recall question that tests your knowledge of specific clinical signs associated with nutritional deficiencies.
Recall or deduce the vitamin deficiency linked to this specific ocular (eye) sign.
Evaluate the options: Vitamin A is directly linked to vision and epithelial health. Deficiencies of vitamins B, C, and D are associated with different systemic effects (neurological, connective tissue, and bone, respectively).
Select the option that directly corresponds to the clinical sign mentioned. Bitot's spots are a classic, pathognomonic sign of Vitamin A deficiency.

Concept Tested & Keywords

QXeGGOv4wOQAnb2f2cwJ5z