Een stabiel thuisleven verbetert de vooruitzichten voor preemiesaugustus 27, 2019
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As they grow and develop, children who were born at least 10 weeks before their due dates are at risk for attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder and anxiety disorders. They also have a higher risk than children who were full-term babies for other neurodevelopmental issues, including cognitive problems, language difficulties and motor delays.
Researchers at Washington University School of Medicine in St. Louis who have been trying to determine what puts such children at risk for these problems have found that their mental health may be related less to medical challenges they face after birth than to the environment the babies enter once they leave the newborn intensive care unit (NICU).
In a new study, the children who were most likely to have overcome the complications of being born so early and who showed normal psychiatric and neurodevelopmental outcomes also were those with healthier, more nurturing mothers and more stable home lives.
The findings are published Aug. 26 in The Journal of Child Psychology and Psychiatry.
“Home environment is what really differentiated these kids,” said first author Rachel E. Lean, PhD, a postdoctoral research associate in child psychiatry. “Preterm children who did the best had mothers who reported lower levels of depression and parenting stress. These children received more cognitive stimulation in the home, with parents who read to them and did other learning-type activities with their children. There also tended to be more stability in their families. That suggests to us that modifiable factors in the home life of a child could lead to positive outcomes for these very preterm infants.”
The researchers evaluated 125 5-year-old children. Of them, 85 had been born at least 10 weeks before their due dates. The other 40 children in the study were born full-term, at 40 weeks’ gestation.
The children completed standardized tests to assess their cognitive, language and motor skills. Parents and teachers also were asked to complete checklists to help determine whether a child might have issues indicative of ADHD or autism spectrum disorder, as well as social or emotional problems or behavioral issues.
It turned out the children who had been born at 30 weeks of gestation or sooner tended to fit into one of four groups. One group, representing 27% of the very preterm children, was found to be particularly resilient.
“They had cognitive, language and motor skills in the normal range, the range we would expect for children their age, and they tended not to have psychiatric issues,” Lean said. “About 45% of the very preterm children, although within the normal range, tended to be at the low end of normal. They were healthy, but they weren’t doing quite as well as the more resilient kids in the first group.”
The other two groups had clear psychiatric issues such as ADHD, autism spectrum disorder or anxiety. A group of about 13% of the very preterm kids had moderate to severe psychiatric problems. The other 15% of children, identified via surveys from teachers, displayed a combination of problems with inattention and with hyperactive and impulsive behavior.
The children in those last two groups weren’t markedly different from other kids in the study in terms of cognitive, language and motor skills, but they had higher rates of ADHD, autism spectrum disorder and other problems.
“The children with psychiatric problems also came from homes with mothers who experienced more ADHD symptoms, higher levels of psychosocial stress, high parenting stress, just more family dysfunction in general,” said senior investigator Cynthia E. Rogers, MD, an associate professor of child psychiatry. “The mothers’ issues and the characteristics of the family environment were likely to be factors for children in these groups with significant impairment. In our clinical programs, we screen mothers for depression and other mental health issues while their babies still are patients in the NICU.”
Rogers and Lean believe the findings may indicate good news because maternal psychiatric health and family environment are modifiable factors that can be targeted with interventions that have the potential to improve long-term outcomes for children who are born prematurely.
“Our results show that it wasn’t necessarily the clinical characteristics infants faced in the NICU that put them at risk for problems later on,” Rogers said. “It was what happened after a baby went home from the NICU. Many people have thought that babies who are born extremely preterm will be the most impaired, but we really didn’t see that in our data. What that means is in addition to focusing on babies’ health in the NICU, we need also to focus on maternal and family functioning if we want to promote optimal development.”
The researchers are continuing to follow the children from the study.
This work was supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, the National Institute of Neurological Disorders and Stroke and the National Institute of Mental Health of the National Institutes of Health (NIH). Grant numbers R01 HD057098, R01 MH113570, K02 NS089852, UL1 TR000448, K23-MH105179 and U54-HD087011. Additional funding was provided by the Cerebral Palsy International Research Foundation, the Dana Foundation, the Child Neurology Foundation and the Doris Duke Charitable Foundation.