Canadian scientists analyzed data covering over 250,000 children and established a link between the presence of congenital heart defects in the mother and an increased risk of various developmental deviations in offspring. It was found that such defects increase the probability of delays in physical, cognitive, emotional, and social aspects of development by 28 percent. The results of this study were published in the scientific journal PLoS Medicine.
General information about heart defects
Congenital heart defects are among the most common categories of developmental anomalies, affecting about one percent of all newborns. According to 2019 data, 13.3 million cases of these diseases were registered worldwide. Thanks to advances in pediatric cardiac surgery, over ninety percent of children with such defects reach adulthood.
However, the increasing number of pregnant women with this developmental defect raises concerns about pregnancy outcomes and subsequent child development. Women suffering from congenital heart defects have an increased risk of preterm birth and giving birth to a low birth weight infant. It is hypothesized that this relationship may be linked to placental function impairments, which negatively affects the nutrition, growth, and overall development of the fetus.
Study methodology
A group of researchers led by Muhammad Hossain from the University of British Columbia studied whether maternal heart defects correlate with an increased risk of neurocognitive problems in children upon school entry. For this, a dataset including 256,629 kindergarten students was analyzed, of whom 48.6 percent were girls, and the average age was 5.6 years. Neurocognitive development was assessed using a questionnaire completed by educators in the second half of the academic year.
This questionnaire is designed to measure children's competencies in five key areas necessary for successful schooling. It consists of 103 questions and covers physical condition and well-being, social competence, emotional maturity, language and cognitive development, as well as communication skills and general knowledge. The main criterion in the study was neurocognitive vulnerability, defined as a score below the 10th percentile in two or more domains.
Main findings of the analysis
The initial analysis revealed that children whose mothers had congenital heart defects were more likely to be born prematurely and had serious developmental anomalies. Approximately 2.2 percent of these children were also diagnosed with congenital heart defects. The proportion of children showing neurocognitive problems was 25.2 percent in the group of mothers with heart defects compared to 16.6 percent among children of healthy mothers. After conducting a corrected analysis, exposed children showed a 28 percent higher risk of developing neurocognitive vulnerability, with delays observed in all studied domains.
Specifically, declines were recorded in areas such as physical independence, gross and fine motor skills, hyperactive and inattentive behavior, general social competence, ability to responsibility and respect, interest and approach to learning, as well as basic literacy and basic arithmetic. Sensitivity analysis showed that the impact of preterm birth accounted for about eight percent, and the association was stronger in children whose mothers also suffered from gestational diabetes. Although excluding children with congenital developmental defects significantly weakened this association, severe form of the disease in the mother had a stronger impact on the risk of child developmental vulnerability than the mild form.
Significance of the results for medicine
The study authors emphasize that the data obtained highlight the need to consider maternal congenital heart defects as a potential risk factor for child developmental disorders. They also point out that optimizing preconception preparation and improving perinatal care can help reduce the likelihood of adverse long-term health and developmental outcomes for children.