What is the first symptom of Vitamin-A deficiency in children?

Bihar CHO - 2021

Applied Nutrition & Dietetics

Easy

Appeared in: Bihar CHO - 2021

Explanation

Night blindness (Nyctalopia) is the earliest functional symptom of Vitamin A deficiency, caused by the impairment of retinal pigments needed for vision in dim light.
According to the WHO classification of xerophthalmia, night blindness is designated as stage XN, preceding all visible clinical signs.
This symptom is a direct result of insufficient retinol for the production of rhodopsin in the rod cells of the retina.

Option A: Dry eyes, or conjunctival xerosis (Stage X1A), is the first clinical sign (an objective finding), but it appears after the symptom of night blindness (a subjective experience).
Option C: Xerophthalmia is not a single symptom; it is the general medical term for the entire spectrum of eye diseases caused by Vitamin A deficiency.
Option D: Bitot's spots are a characteristic but later sign of Vitamin A deficiency, classified as Stage X1B. They appear after night blindness and conjunctival xerosis have already developed.

Clinical Relevance

Nursing practice connection: Knowing Early manifestations of Vitamin A deficiency helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Early identification of night blindness by nurses during community health screenings or parental interviews is critical for preventing irreversible blindness in children.
Nurses play a key role in health education, teaching parents to recognize night blindness as an early warning sign and to seek prompt medical care.
Nurses are directly responsible for administering the Vitamin A prophylaxis schedule as per national guidelines, a crucial public health intervention to prevent deficiency.

How to Approach the Question

First, identify the key terms in the question: 'first symptom' and 'Vitamin-A deficiency'.
Differentiate between a 'symptom' (a subjective experience reported by the patient, like poor vision) and a 'sign' (an objective finding observed by a clinician, like dry eyes or spots).
Recall the pathophysiology of Vitamin A deficiency. The first function affected is the synthesis of rhodopsin in the retina's rod cells, which is essential for vision in low light.
Evaluate the options based on this understanding. 'Night blindness' is a direct functional consequence and a symptom. 'Dry Eyes' and 'Bitot's Spot' are physical signs. 'Xerophthalmia' is the name for the entire condition.
Conclude that night blindness is the earliest manifestation and therefore the correct answer.

Concept Tested & Keywords

Concept Tested: Early manifestations of Vitamin A deficiency
Stem keywords: Vitamin-A deficiency, children, first symptom
Lead-in keywords: What is
Clinical cues: The question asks for the 'first symptom', which is a subjective experience, distinguishing it from a 'sign' which is an objective finding.

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