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Our group has previously demonstrated an increased risk of placenta praevia with increased ECT. These new findings suggest that the directionality of the uterine peristalsis waves matters more than their frequency or amplitude. Combining the data from both studies we now hypothesize that increased ECT is a marker for increased fundus-to-cervix uterine peristalsis, explaining both the increased placenta praevia risk and the lower EP risk. Further prospective studies are required to confirm these observations.

No funding was required for this study. L.R. has a minority shareholding in Monash IVF and has received unconditional research and educational grants from MSD, Merck-Serono and Ferring. L.R. serves on an advisory board for MSD and Ferring.