Late-term Prenatal MRI for Evaluating Maternal Changes and their Correlation with Supine Hypotension Syndrome for Cesarean Section

Motivation: Effectively preventing supine hypotension syndrome (SHS) is difficult due to the lack of sufficient in vivo abdominal MRI data. Goal(s): This study aimed to retrospectively analyze the changes in the quantitative parameters of maternal MRI in late pregnancy to identify potential predictors of SHS. Approach: By examining late-term prenatal MRI scans, we observed changes in several quantitative parameters. Results: The abdominal–right uterine surface area ratio, dural sac anteroposterior diameter, ratio of epidural space anteroposterior diameter to dural sac, anteroposterior diameter, and left and right vertebral vein short-axis measurements were found to be helpful in determining SHS. Impact: Late-term prenatal MRI can fully display the changes in maternal structure, providing a method for preoperative prediction of SHS after anesthesia.