An anthropological perspective on the evolutionary context of preeclampsia in humans

Area of Science:

• Evolutionary biology
• Human reproduction
• Perinatal medicine

Background:

• Preeclampsia/eclampsia is a human-specific pregnancy complication.
• It is associated with energetically demanding fetal brain development and invasive trophoblast implantation.
• Human biological traits such as large brains, bipedalism, and helpless newborns uniquely constrain pregnancy and childbirth.

Purpose of the Study:

• To review the evolutionary history of human pregnancy and childbirth.
• To provide context for evolutionary hypotheses regarding the origin of preeclampsia.
• To explore the link between human biological distinctiveness and pregnancy risks.

Main Methods:

• Literature review of evolutionary biology and human reproduction.
• Analysis of human biological traits and their impact on childbirth.
• Synthesis of evolutionary and medical perspectives on preeclampsia.

Main Results:

• Human biological characteristics create unique challenges in pregnancy and birth, including cephalopelvic disproportion and shoulder dystocia.
• These challenges necessitate cultural adaptations like childbirth assistance and intensive parental care.
• Preeclampsia likely emerged with increased human brain size and modern birth mechanisms, representing a risk inherent to these human adaptations.

Conclusions:

• Preeclampsia is an evolutionary risk associated with distinctive human pregnancy and childbirth characteristics.
• Medical interventions currently mitigate preeclampsia risks.
• Cultural interventions during pregnancy may have historical evolutionary roots, similar to childbirth assistance.