*Evaluation of the effectivity of the electrohysterogram to monitor trial of labour: multicentre randomised controlled trial.*

Avoiding the morbidity of repeat caesarean section through vaginal birth after
caesarean (VBAC) is an attractive option in a majority of women. Moreover the
costs of a vaginal birth are much less than the costs of a caesarean section.
However, the success rate of TOL is low. Tocodynamometry is currently used as
monitoring technique. The test properties of tocodynamometry are poor and the
technique is invasive (IUPC). An innovative technique, electrohysterography
(EHG), is developed and extensively evaluated in a collaboration between TU/e
and MMC. The advantage of EHG is that it is non-invasive,
accurate, and applicable on a continuous basis.

To evaluate the effectivity of the electrohysterogram (EHG) by means of a
tocopatch electrode compared to tocodynamometry by means of an external
tocodynamometer or intrauterine pressure catheter (IUPC) to monitor trial of
labour (TOL) in patients with one previous caesarean section (c.section) in
order to increase the VBAC rate without increasing the risk of uterine rupture.

Multicentre randomised clinical trial

The tocopatch is a non-invasive method, from which minimal risks are expected.
The extent of the burden associated with participation is minimal. It is
necesarry to use this population for this study, because of the objects of this
study.