The shape of uterine contractions and labor progress in the spontaneous active labor.

24 The channels that hold recumbent membrane potential lead to membrane repolarization, which may be significant for holding uterine silence. 24 Vasak et al. concluded that the PDS peak frequency of contractions which lead to cesarean section was significantly different from contraction in normal vaginal delivery. 23 Fetal head station and cervical dilation are the two main physiological factors by which the progress of labor is evaluated, and uterine contractions affect both factors. 25 It seems that the uterine activity is an adaptation mechanism, in case there is an obstacle during the fetal descent.

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