Neural tube defects can be prevented by?

AIIMS Rishikesh & Jodhpur NO - 2017

Obstetrics & Gynaecology

Easy

Appeared in: AIIMS Rishikesh & Jodhpur NO - 2017

Explanation

Maternal folate (folic acid) supplementation is the most effective primary prevention strategy for neural tube defects (NTDs).
Folic acid is essential for the proper closure of the neural tube, which occurs within the first 28 days of gestation, often before a woman is aware of her pregnancy.
Public health guidelines recommend a daily intake of 400 mcg (0.4 mg) of folic acid for all women of childbearing age to reduce the risk of NTDs.
For women with a previous NTD-affected pregnancy, a higher dose of 4 mg daily is recommended, starting at least one month before conception.

Option A: While hydration is crucial for overall maternal and fetal health, it does not play a direct role in the biochemical processes of neural tube closure and therefore does not prevent NTDs.
Option B: This option is too general. Although folic acid is a B vitamin (B9), the specific preventive effect against NTDs is attributed to folic acid, not the entire B-complex. Other B vitamins do not have the same proven role in preventing NTDs.
Option D: Valproic acid is a known teratogen. Taking this medication during pregnancy significantly increases the risk of having a child with an NTD, particularly spina bifida. It is a cause of NTDs, not a preventive measure.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Prevention of Neural Tube Defects (NTDs) as background academic context rather than a clinical decision trigger.
A key nursing responsibility is to educate all women of reproductive age about the importance of daily folic acid supplementation, as nearly half of all pregnancies are unplanned. This proactive education can significantly reduce the incidence of NTDs.
Nurses must assess for high-risk factors, such as a personal or family history of NTDs, or use of certain medications like valproic acid, to ensure patients receive counseling and prescriptions for higher-dose folic acid.
What if? If a patient is taking valproic acid for seizure control and is planning a pregnancy, the nurse should facilitate a consultation with the neurologist and obstetrician. The plan would involve discussing alternative medications and initiating a high-dose (4-5 mg) folic acid supplement preconceptionally to reduce the teratogenic risk.

How to Approach the Question

First, identify the core of the question, which is asking for the primary prevention method for neural tube defects (NTDs).
Recall that NTDs are common birth defects and their prevention is a major public health topic in prenatal care.
Evaluate the options based on established medical knowledge. The link between folic acid and NTD prevention is a foundational concept.
Option C, 'Maternal folate supplementation,' is the most specific and accurate answer.
Analyze the distractors to confirm your choice. Recognize that 'hydration' (A) is non-specific, 'vitamin B complex' (B) is too general, and 'valproic acid' (D) is a known cause of NTDs, making it the opposite of a preventive measure.

Concept Tested & Keywords

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