Maternal Serum Folate Levels During Pregnancy Linked to Congenital Heart Disease Risk

METHODOLOGY:

• Researchers conducted a case-control study with 129 participants with CHD and 516 matched control participants from Guangdong Provincial People's Hospital in China between 2015 and 2018.
• Maternal serum levels of folate, vitamin B12, and homocysteine were measured at around 16 weeks of gestation using a chemiluminescence microparticle immunoassay.
• CHD was confirmed using echocardiography, and the participants were matched by maternal age at a ratio of 1:4.
• Covariates included periconceptional folic acid supplementation, maternal education, occupation, parity, abortion history, pregnancy complications, and genetic polymorphisms related to folate metabolism.
• Conditional logistic regression was used to assess the associations, with adjustments for various covariates and sensitivity analyses excluding participants with missing genetic data.

TAKEAWAY:

• A U-shaped association was found between maternal serum folate levels and CHD risk in offspring, with both low and high levels linked to increased risk (P < .001).
• Low maternal folate levels were associated with an adjusted odds ratio (aOR) of 3.09 (95% CI, 1.88-5.08) for CHD risk, whereas high levels had an aOR of 1.81 (95% CI, 1.07-3.06).
• Using World Health Organization criteria, folate deficiency (< 5.9 ng/mL) had an aOR of 18.97 (95% CI, 3.87-93.11) and elevated levels (> 20 ng/mL) had an aOR of 5.71 (95% CI, 2.72-11.98) for CHD risk.
• Vitamin B12 deficiency and elevated homocysteine levels further increased the risk associated with both low and high maternal folate levels.

Insufficient folate and vitamin B12 can lead to increased homocysteine levels, which is harmful to the cardiovascular system. Thus, homocysteine might act as a central mediator in the relationships between deficiencies in folate and vitamin B12 and the risk of CHD. Additionally, the role of folate extends beyond homocysteine mediation, contributing independently to placental implantation and vascular remodeling, irrespective of vitamin B12 and homocysteine levels.

 

https://www.medscape.com/viewarticle/maternal-serum-folate-levels-during-pregnancy-linked-2024a1000ij7