Monitoring the uterine contractions provides important prognostic information during pregnancy and delivery. In particular, the propagation of uterine activity is closely related to the contraction efficiency. In the present study, a propagation analysis of uterine contraction is carried out by simultaneously recording the electrohysterogram (EHG) and the internal uterine pressure (IUP) on one woman in the last 4 hours of labor. The EHG, recorded in a monopolar multi-electrode configuration, was first processed in each channel in order to provide an accurate estimate of the IUP. The IUP estimate resulted in a correlation coefficient with the simultaneously recorded IUP r=0.74. Eventually, in order to evaluate the propagation of the muscular electrical activity, the delays among the IUP estimates in each channels were calculated by cross correlation function maximization. In agreement with previous studies, no preferred direction of propagation was singled out and pacemaker areas changed from contraction to contraction. However, by analyzing the occurrences of each pacemaker area, the uterine upper part resulted the most frequent location. Moreover, the close agreement between the number of simultaneously active electrodes and the IUP peak values (r=0.76) revealed a relationship between the spreading of action potentials and the maximum amplitude of contraction.
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机译：监测子宫收缩在怀孕期间提供重要的预后信息。特别地，子宫活性的繁殖与收缩效率密切相关。在本研究中，通过在劳动力的最后4小时内同时记录一个女性的电力照片（EHG）和内部子宫压（IUP）来进行子宫收缩的传播分析。记录在单极多电极配置中的EHG，首先在每个通道中处理，以便提供对IUP的准确估计。 IUP估计导致相关系数，同时记录的IUP r = 0.74。最终，为了评估肌肉电活动的传播，通过互相关函数最大化计算每个通道中的IUP估计中的延迟。在与先前的研究一致中，没有单打优选的传播方向，起搏器区域从收缩到收缩变化。然而，通过分析每个起搏器区域的发生，子宫上部将导致最频繁的位置。此外，同时主动电极的数量与IUP峰值（R = 0.76）之间的密切一致性地揭示了动作电位的扩展与收缩的最大幅度之间的关系。
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