Bitot spot is caused by deficiency of?

NHM UP Staff Nurse - 2017

Applied Nutrition & Dietetics

Easy

Appeared in: NHM UP Staff Nurse - 2017

Explanation

Bitot's spots are a hallmark clinical sign specifically caused by a deficiency of Vitamin A.
As shown in the provided image, these spots are triangular, dry, and foamy-looking plaques that appear on the white part of the eye (bulbar conjunctiva).
Vitamin A is essential for maintaining the integrity of epithelial tissues. Its deficiency leads to keratinization of the conjunctiva, which results in the formation of these spots.
These spots are a key feature of xerophthalmia, the spectrum of eye problems caused by Vitamin A deficiency, which can lead to blindness if untreated.

Option B: Deficiencies in the Vitamin B complex lead to a variety of other conditions, none of which include Bitot's spots. For example, B1 deficiency causes Beriberi, and B3 deficiency causes Pellagra.
Option C: Vitamin C deficiency results in Scurvy, which is characterized by impaired collagen synthesis, leading to symptoms like bleeding gums, poor wound healing, and corkscrew hairs.
Option D: Vitamin B6 (pyridoxine) deficiency is associated with neurological issues like peripheral neuropathy, skin problems like seborrheic dermatitis, and hematological issues like microcytic anemia.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Nutritional Deficiencies and Ocular Manifestations as background academic context rather than a clinical decision trigger.
Nurses, especially in community and pediatric settings, are on the front line for identifying early signs of malnutrition like Bitot's spots. Early recognition is critical.
Prompt identification and referral for Vitamin A supplementation can prevent the progression to irreversible blindness, making this a crucial public health intervention.
Patient education on dietary sources of Vitamin A (e.g., green leafy vegetables, yellow fruits, liver, eggs) is a key nursing role in preventing this deficiency.

How to Approach the Question

First, analyze the question stem. The key term is 'Bitot spot'.
Second, examine the image provided. The image clearly shows a triangular, foamy, white patch on the conjunctiva, which is the classic appearance of a Bitot's spot.
Third, access your knowledge base to link the clinical sign to its underlying cause. Bitot's spots are a pathognomonic sign of a specific nutritional deficiency.
Fourth, evaluate the options. Recall the major deficiency diseases associated with each vitamin.
Connect 'Bitot's spot' directly to Vitamin A deficiency (Xerophthalmia).
Eliminate the other options by confirming they cause different conditions: Vitamin B complex (various), Vitamin C (Scurvy), and Vitamin B6 (neuropathy, anemia).

Concept Tested & Keywords

Concept Tested: Nutritional Deficiencies and Ocular Manifestations
Stem keywords: Bitot spot, deficiency
Lead-in keywords: caused by
Clinical cues: The presence of a Bitot's spot in the image is a pathognomonic sign pointing directly to a specific vitamin deficiency.

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