prognostic information during pregnancy and parturition. Existing
methods impose a compromise between reliability and invasiveness.
We evaluated the reliability of a novel method for non-invasive
quantitative estimation of internal uterine pressure (IUP) by
electrohysterogram (EHG) analysis.
Method: The EHG originating from the uterine muscle contraction is
recorded by ten contact electrodes. The EHG signal is first made
bipolar by subtracting the signals recorded at close electrode
positions. A first estimation of the IUP is then derived by power
spectral analysis. The estimate accuracy is finally increased by a nonlinear
model, which takes into account the gain and possible nonlinearities
effects describing the relationship between electrical and
mechanical activity of the uterus.
Results: The proposed method was tested on nine women in labor.
Simultaneous IUP recordings by an IUP catheter (IUPC) were
employed for validation. The average results over all electrodes and
subjects obtained with the proposed method showed a correlation
coefficient with the simultaneously recorded IUP r=0.72 (p
|Title of host publication||Proceedings of the 8th World Congress of Perinatal Medicine, 9th until 13th September 2007, Florence, Italy|
|Publication status||Published - 2007|
|Name||Journal of perinatal medicine|