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RELATION BETWEEN PLACENTAL SITE AND LENGTH OF GESTATION
Article first published online: 23 AUG 2005
DOI: 10.1111/j.1471-0528.1975.tb00691.x
Issue
1471-0528/asset/cover.gif?v=1&s=b4e1d96c46e18c61210d584b63c13ee375cf562b "BJOG: An International Journal of Obstetrics & Gynaecology")
BJOG: An International Journal of Obstetrics & Gynaecology
Volume 82, Issue 7, pages 581–584, July 1975
Additional Information
How to Cite
Harris, V. G. (1975), RELATION BETWEEN PLACENTAL SITE AND LENGTH OF GESTATION. BJOG: An International Journal of Obstetrics & Gynaecology, 82: 581–584. doi: 10.1111/j.1471-0528.1975.tb00691.x
Publication History
- Issue published online: 23 AUG 2005
- Article first published online: 23 AUG 2005
- Abstract
- References
- Cited By
Summary
Two theories related to uterine action have been brought together to see whether the site of placental implantation influences the onset of labour: (1) that uterine contractions begin asymmetrically from a “pacemaker” in one uterine horn, and (2) that progesterone from the placenta blocks myometrial contractility primarily at the site of implantation. Case records were examined of 182 patients who had placental locations performed and who had a spontaneous onset of labour. Where the placenta was implanted in the right upper quadrant of the uterus labour occurred on average four days sooner than when it was implanted in the left upper quadrant: the difference was statistically significant.