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Is cesarean section a cause of affective disorders?-A national cohort study using sibling designs
Paul Bryde Axelsson1, Anne Helby Petersen2, Ida Hageman3
1Nordsjællands Hospital, University of Copenhagen, Department of Gynaecology and Obstetrics, Hillerød, Denmark.
Insights
Cesarean delivery may be associated with an increased risk of affective disorders in children. However, sibling analyses suggest this link is not explained by gut microbiota changes, challenging the gut-brain axis hypothesis.
Area of Science:
- Neuroscience
- Pediatrics
- Psychiatry
Background:
- Cesarean section alters infant gut microbiota composition compared to vaginal delivery.
- The gut-brain axis hypothesis suggests potential links between early-life exposures and mental health.
- Cesarean delivery is a potential risk factor for affective disorders in children.
Purpose of the Study:
- To investigate the association between cesarean delivery and the risk of affective disorders in a large cohort of Danish children.
- To explore whether the gut-brain axis, mediated by gut microbiota, explains any observed association.
Main Methods:
- A population-based prospective cohort study of Danish children born between 1982 and 2001, followed until 2015.
- Standard Cox models and Cox sibling models were used to assess the effect of delivery mode on affective disorder risk.
- Affective disorders were identified using diagnostic codes or prescriptions for antidepressants and lithium.
Main Results:
- A large cohort (1,009,444 children) was followed for 8,880,794 person-years.
- Standard models showed increased affective disorder risk for both pre-labor and intrapartum cesarean sections.
- The association between pre-labor cesarean section and affective disorders was not significant in sibling models, while intrapartum cesarean section showed a borderline significant association.
Conclusions:
- The findings do not support the hypothesis that delivery-mode-dependent gut microbiota changes cause subsequent affective disorders.
- While an association between cesarean delivery and affective disorders was observed, it may not be directly mediated by the gut microbiome.
- Further research is needed to elucidate the complex relationship between delivery mode and mental health outcomes.
Background:
The gut microbiota of children delivered by cesarean section differs from that of children delivered vaginally. In light of the gut-brain axis hypothesis, cesarean section may influence risk of affective disorders.
Methods:
Population based prospective cohort study included Danish children born 1982 through 2001, with follow-up until 2015. The effect of delivery mode on the risk of affective disorders was assessed using a standard Cox model and two types of Cox sibling models. Diagnostic codes or prescriptions for antidepressants and lithium were used to define cases of affective disorders.
Results:
1,009,444 children were followed for 8,880,794 person-years from the age of 13 years, with relevant covariates available from birth. There are strong calendar time trends in the occurrence of affective disorders with an increasingly younger age at first diagnosis and with a hotspot between the years 2007-2012. Fully adjusted standard Cox models showed an increased risk of affective disorders for both pre-labor (hazard ratio [HR], 1.11; 95% confidence interval [CI], 1.08-1.15) and intrapartum (HR, 1.07; 95% CI, 1.05-1.10) cesarean section, compared to vaginal delivery. This effect disappeared in the between-within sibling model for pre-labor (HR, 1.00; 95% CI, 0.94-1.07) but not intrapartum (HR, 1.05; 95% CI, 1.00-1.12) cesarean section.
Limitations:
Interpretation of results from sibling models may not be relevant to children without siblings.
Conclusions:
These results do not support the hypothesis that a delivery-mode dependent change in gut microbiota is a cause of subsequent affective disorders, despite an apparent association with delivery mode.
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