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Uterine Activity in Oxytocin Induced Labour
Author(s) -
Arulkumaran S.,
Gibb D. M. F.,
Ratnam S. S.,
Heng S. H.,
Lun K. C.
Publication year - 1986
Publication title -
asia‐oceania journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 50
eISSN - 1447-0756
pISSN - 0389-2328
DOI - 10.1111/j.1447-0756.1986.tb00231.x
Subject(s) - oxytocin , medicine , uterine contraction , tonicity , parity (physics) , uterus , gynecology , obstetrics , endocrinology , physics , particle physics
Abstract 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.