Non-invasive estimation of the internal uterine pressure by electrohysterography

C. Rabotti, M. Mischi, J. Laar, van de, S.G. Oei, J.W.M. Bergmans

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


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
Original languageEnglish
Title of host publicationProceedings of the 8th World Congress of Perinatal Medicine, 9th until 13th September 2007, Florence, Italy
Publication statusPublished - 2007

Publication series

NameJournal of perinatal medicine
Numbersuppl. 2
ISSN (Print)0300-5577


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