Decreased brain functional connectivity associated with cognitive dysfunction in women with second pregnancy

Area of Science:

• Neuroscience
• Cognitive Science
• Medical Imaging

Background:

• Previous research suggests a link between second pregnancies and cognitive dysfunction.
• Understanding postpartum brain changes is crucial for maternal health.

Purpose of the Study:

• To investigate functional connectivity (FC) patterns in the default mode network (DMN) of postpartum women.
• To specifically examine FC in parous women (those who have had previous pregnancies) using resting-state functional magnetic resonance imaging (rs-fMRI).

Main Methods:

• rs-fMRI scans were conducted on parous (20), primiparous (26), and nulliparous (30) women, matched for age and education.
• A seed-based FC analysis focused on the posterior cingulate cortex (PCC) to map connectivity.
• Relationships between FC patterns and cognitive performance were assessed.

Main Results:

• Parous women exhibited decreased FC between the PCC and the right middle frontal gyrus and right parahippocampal gyrus compared to primiparous women.
• This decreased FC to the parahippocampal gyrus correlated with lower scores on a DST test.
• Parous women also showed reduced FC between the PCC and left frontal regions compared to nulliparous women, associated with lower DST scores.

Conclusions:

• Women with a second pregnancy demonstrate reduced FC within DMN regions, including the parahippocampal gyrus and prefrontal cortex.
• These connectivity changes are associated with specific cognitive impairments.
• The findings offer insights into the neuropathological mechanisms of postpartum cognitive impairment and neurobiology.