Which of the following deficiency in pregnancy is associated with increased incidence of congenital malformations?

Appeared in: IGNOU PB Bsc Entrance-2022

Explanation

Folic acid (Vitamin B9) is critical for DNA synthesis and rapid cell division, which are fundamental processes in early embryonic development.
The neural tube, the precursor to the brain and spinal cord, forms and closes between the 3rd and 4th week of gestation.
A deficiency in folic acid during this crucial period disrupts the closure process, leading to severe and often life-threatening neural tube defects (NTDs) like spina bifida and anencephaly.
Public health initiatives, including mandatory fortification of cereal products with folic acid, have significantly reduced the incidence of NTDs, highlighting the direct causal link.

Option B: While Vitamin B12 (Cyanocobalamin) works with folate in DNA synthesis, its deficiency is more strongly associated with maternal megaloblastic anemia and neurological symptoms. Its role as an independent risk factor for congenital malformations is less established than that of folic acid.
Option C: Thiamine (Vitamin B1) deficiency causes Beriberi, which affects the cardiovascular and nervous systems of the mother and can lead to infantile Beriberi, but it is not directly linked to causing structural congenital malformations.
Option D: The question asks about a deficiency. While Vitamin A is essential, its excess (hypervitaminosis A) is a potent teratogen causing birth defects. Vitamin A deficiency is associated with maternal night blindness and increased risk of anemia and preterm birth, not major structural malformations.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The role of specific vitamin deficiencies during pregnancy as a cause of congenital malformations as background academic context rather than a clinical decision trigger.
Preconception counseling is a key nursing responsibility. Since the neural tube closes before many women are aware of their pregnancy, advising all women of childbearing age to take daily folic acid is a critical preventive measure.
Nurses must educate patients on the correct dosage. The standard recommendation is 400 mcg/day, but this increases to 4 mg/day for high-risk women (e.g., those with a previous NTD-affected pregnancy).
Dietary teaching is also important. While supplements are necessary, nurses should encourage patients to consume folate-rich foods like leafy greens, legumes, and fortified grains as part of a healthy diet.

How to Approach the Question

First, identify the core concepts in the question: 'deficiency,' 'pregnancy,' and 'congenital malformations.'
This is a factual recall question that tests your knowledge of prenatal nutrition and its impact on fetal development.
Systematically evaluate each option's role in pregnancy.
Recall that Folic acid is the most well-known vitamin linked to the prevention of neural tube defects, a major class of congenital malformations.
Consider the other options. Remember that Vitamin A excess is teratogenic, not deficiency. Rule out Thiamine and Cyanocobalamin as they are primarily linked to other conditions (Beriberi and megaloblastic anemia, respectively).
Select Folic acid as the most accurate and directly related answer.

Concept Tested & Keywords

Concept Tested: The role of specific vitamin deficiencies during pregnancy as a cause of congenital malformations.
Stem keywords: deficiency, pregnancy, congenital malformations
Lead-in keywords: Which

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E6 Obstetrics Williams p. 81-95

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 155-157

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