Relationship Between Congenital Cardiac Birth Defects and Uncontrolled Diabetes in Pregnant Women

Overview of Diabetes Types

A recent article in the BMJ highlights the correlation between congenital cardiac birth defects and pregnant women who experience uncontrolled diabetes prior to conception. Diabetes is categorized into two main types: type 1 and type 2. Type 1 diabetes is typically present from birth due to the pancreas’s inability to produce sufficient insulin. This deficiency disrupts the effective use of glucose from food, resulting in elevated glucose levels in the bloodstream. If not properly managed, this condition can lead to various complications.

Risks Associated with Diabetes During Pregnancy

Pregnant women with diabetes face numerous risks for both themselves and their newborns. These risks include delivering larger babies and the potential for congenital birth defects, which may encompass multiple abnormalities. Symptoms experienced by these women often stem from changes in energy metabolism. Many may be overweight and have elevated glucose levels, which can be exacerbated by physiological changes during pregnancy. The excess glucose in the bloodstream can be transferred to the developing fetus, leading to rapid cell division and growth, which increases the likelihood of delivering larger babies.

Impact of Increased Fetal Growth

The accelerated growth of the fetus poses various challenges for both the mother and child. Women may experience a higher likelihood of complications such as miscarriages, preterm labor, infections, excessive amniotic fluid, and maternal distress. Additionally, the fetus may face a heightened risk of congenital malformations affecting the nervous system, cardiac system, kidneys, and gastrointestinal system.

Research on Birth Defects Linked to Uncontrolled Diabetes

To investigate the severity of birth defects in infants born to mothers with uncontrolled diabetes, researchers led by Ludvigsson in Stockholm, Sweden, conducted a study published in the BMJ. This randomized controlled study compared non-diabetic women with pregnant women diagnosed with type 1 diabetes. The study analyzed data from 2,458 singleton live births of mothers with type 1 diabetes, evaluating blood glucose levels and glycated hemoglobin measurements taken during the three months preceding pregnancy.

Study Findings

The findings revealed 122 instances of cardiac defects among the infants studied, indicating a two-fold increase in the occurrence of cardiac defects associated with uncontrolled diabetes before pregnancy. This risk persisted regardless of whether blood glucose levels were managed effectively during pregnancy.

Importance of Glycemic Control Before Pregnancy

These findings underscore the critical need for women with type 1 diabetes to maintain healthy blood glucose levels prior to conception. Adequate medical care and proper management of diabetes are essential to minimize the risk of congenital abnormalities in their offspring.

Conclusion

Ensuring proper glycemic control in women with diabetes before pregnancy is vital to promote healthier outcomes for both mothers and their babies.

Reference

Ludvigsson, Jonas F., et al. “Periconception glycaemic control in women with type 1 diabetes and risk of major birth defects: population based cohort study in Sweden.” BMJ 362 (2018): k2638.

Written by Dr. Apollina Sharma, MBBS, GradDip EXMD.