Total uterine activity in induced labour—an index of cervical and pelvic tissue resistance

S. ARULKUMARAN, D. M.F. GIBB, S. S. RATNAM, K. C. LUN, S. H. HENG

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Summary. Uterine activity was studied during labour induced using an automatic infusion system (AIS) or a peristaltic infusion pump (IVAC) to administer oxytocin. In the 110 patients who achieved vaginal delivery the total uterine activity required to effect full dilatation of the uterine cervix was found to vary according to parity and cervical score but not according to mode of oxytocin infusion. Irrespective of whether the uterine activity level per 15 min was maintained at between 700 and 1500 kPas or at between 1500 and 2000 kPas, the total uterine activity was similar the lower levels being compensated for by a longer duration. Fetal outcome, in terms of 1‐and 5‐min Apgar scores and umbilical vein blood pH, was unaffected by the level of uterine activity. The cervical and pelvic tissue resistance varies according to parity and cervical score and the uterus has to achieve a certain total uterine activity in induced labour which is best achieved by maintaining optimal uterine activity levels of 1500–2000 kPas/15 min to effect vaginal delivery of the baby in good condition in optimal time.

Original languageEnglish
Pages (from-to)693-697
Number of pages5
JournalBJOG: An International Journal of Obstetrics & Gynaecology
Volume92
Issue number7
DOIs
Publication statusPublished - 1985

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