Children who experience childhood trauma more likely to develop heart disease
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The largest study so far to look at the links between childhood adversity and cardiovascular disease (CVD) has discovered that children who experience adversity, including serious family illness or death, poverty, neglect, or dysfunctional and stressful family relationships, are at increased risk of developing diseases of the heart or blood vessels in early adulthood.
Published in the European Heart Journal, the study reports the findings from researchers following nearly 1.3 million children born between January 1980 and December 2001, up until 31 December 2018. During this time, 4,118 developed CVD between their 16th birthday and the end of 2018, by which time the oldest were 38 years old.
“Compared to young adults who experienced little adversity in childhood, we found an approximately 60 per cent higher risk of developing cardiovascular disease among young adults who had experienced adversity,” explained Senior author Professor Naja Hulvej Rod.
“This was especially true for those who had experienced serious illnesses, such as cancer, heart or lung diseases, or death in the family, and those who had experienced high and accelerating levels of adversity in childhood.”
The researchers used data from the DANish LIFE course (DANLIFE) cohort, which includes continuously recorded information from numerous nationwide registers. They identified 1,263,013 children who were alive and living in Denmark until their 16th birthday and who were not diagnosed with CVD or congenital heart disease during this time.
They divided them into five groups based on adversity experienced between the ages from birth to 15 years:
1) those that experienced low adversity during childhood;
2) early life material deprivation (for instance, poverty and long-term unemployment in the family during early life);
3) persistent deprivation (material deprivation experienced through into adolescence);
4) loss or threat of loss (high rates of serious illness or death among parents or siblings); and,
5) high adversity (covering exposure to any or all of the previous types of adversity, particularly dysfunctional and stressful family relationships, experienced on average every year during adolescence).
Adjustments were made to the analysis to account for factors that could also increase the risk of CVD, such as age, maternal age at birth, parental origin, and any parental diseases of the heart, blood vessels or metabolism. In supplementary analyses, they also adjusted for gestational age and parental education. They excluded people whose parents had an illness related to the heart or metabolism, such as diabetes or heart disease, which might predispose their children to developing these conditions.
“The association we saw between childhood adversity and CVD in early adulthood may be explained partly by behaviours that can affect health, such as drinking alcohol, smoking and physical inactivity. Childhood is a sensitive period characterised by rapid cognitive and physical developments; the frequent and chronic exposure to adversity in childhood may influence the development of the physiological stress response, and this may provide an important explanation for the mechanisms underlying these findings,” Professor Rod said.
The researchers plan to investigate the possible underlying mechanisms for their findings so as to understand the impact of childhood adversity on CVD prognosis and survival. This will include access to health care, possible non-compliance with treatments, and other health problems among children from socially difficult backgrounds. The current study has built on earlier work the researchers carried out that showed a substantially higher risk of premature mortality, including deaths due to CVD, and hospitalisations due CVD among young adults, who had experienced adversity in childhood and adolescence.
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