Uterine Activity in Oxytocin Induced Labour

S. Arulkumaran, D. M.F. Gibb, S. S. Ratnam, S. H. Heng, K. C. Lun

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2 Citations (Scopus)


Uterine activity measured by quantifying active contraction area in induced labour showed an initial significant steep increase (incremental phase) followed by a stable phase when the uterine activity was about 1750 k Pas/15 min in nulliparae and multi‐parae with poor cervical score; it was 1500 k Pas/15 min in multiparae with good cervical score. Once this was achieved, further increase in oxytocin dosage did not increase uterine activity but instead revealed a tendency to hypertonic uterine contractions. A marked rise in uterine activity was observed in the late first stage of labour (terminal phase) despite no increase in oxytocin in patients with good cervical scores (>6) at induction but not in those with poor cervical scores (<5). The uterine activity in the stable phase of oxytocin‐induced labour was not significantly influenced by parity and cervical score except multiparae with a cervical score of six or more who had significantly less uterine activity compared to multiparae with poor cervical score or nulliparae.

Original languageEnglish
Pages (from-to)533-540
Number of pages8
JournalAsia‐Oceania Journal of Obstetrics and Gynaecology
Issue number4
Publication statusPublished - 1986


  • active contraction area
  • incremental phase
  • induction
  • oxytocin
  • stable phase


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