Continuous recording intrarectal pressures during the second phase of labor

Parameters of intrarectal pressure (surface area under pressure curve and peak pressure) recorded with a microsystem device during the second phase of labor showed no significant correlations with baby's weight or mode of delivery. Was to assess the biomechanical pressures delivered against pelvic floor structures during the second phase of labor in nulliparae women, and to correlate them with obstetrics parameters, i.e. baby'sweight and mode of delivery. Using a microsystem device placed into the rectum at the beginning of the second phase of labor, two parameters were assessed during the bearing efforts in 59 nulliparae women: the surface area under the pressure curve and the peak pressure. During 11.5±9 bearing efforts of 99.1±16s duration, the mean value of surface area under the pressure curve was 32677±26058cm/s and the mean value of the peak pressure was 60.7±24cmH2O, exceeding 100cmH2O in 10% of women. These two parameters were not correlated with baby's weight (R: 0.19, P: 0.15 and R: 0.05, P: 0.71). In the same way, these two parameters were not correlated with the mode of delivery (spontaneous or forceps/vacuum-assisted). Furthermore, the individual values of these two parameters showed great variation from one woman to another. This study has showed that parameters of biomechanical pressures recorded into the rectum during second phase of labor had no significant correlations with obstetricals parameters, explaining why these latter have poor predicitive value of further pelvic floor problems. Les paramètres de pression intrarectale (surface sous la courbe de pression et pics de pression) enregistrés grâce à un microsystem pendant la phase expulsive n’ont pas montré de corrélations significatives avec le poids du bébé ou le mode d’accouchement. À été de mesurer les contraintes bioméchaniques délivrées aux structures neuromusculaires du plancher pelvien pendant la phase expulsive de l’accouchement dans un collectif de nullipares, et de corréler ces mesures aux paramètres obstétricaux représentés par le poids du bébé et le mode d’accouchement. En utilisant un microsystème créé à cet effet et placé dans le rectum au début de la phase expulsive, deux paramètres ont été calculés pendant les efforts de poussée chez 59 nullipares : la surface sous la courbe de pression et les pics de pression développés pendant les poussées. Pendant les 11,5±9 poussées de 99,1±16 s de durée, la valeur moyenne de la surface calculée sous la courbe de pression a été de