Intrauterine‐pressure studies in African nulliparae: normal labour progress

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Abstract
Uterine activity was measured in 29 nulliparous African women, who were in the active phase of spontaneous labor, and who were delivered vaginally without supplementary oxytocin. A fluid-filled intrauterine catheter, an external strain gauge and a pressure-curve integrator were used to quantitate uterine activity. The rate of dilatation of the cervix from entry to the study to full dilatation of the cervix was > 1 cm/h; this constituted normal labor progress. In nulliparous African women, the minimum level of uterine activity likely to be associated with a cervical dilatation rate of 1 cm/h was 1200 kPas[Pascals]/15 min and the median uterine activity level in the active phase of normal labor was 1824 kPas/15 min.

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