Korean J Obstet Gynecol.  2005 Dec;48(12):2843-2849.

The length of active labor in women with vaginal birth after cesarean section compared with nulliparas and multiparas

  • 1Department of Obstetrics and Gynecology, College of Medicine, The Catholic University of Korea, Seoul, Korea. ly@catholic.ac.kr


Despite the general information of vaginal birth after cesarean section (VBAC), little is known about the duration of active labor in women attempting VBAC. The aim of this study was to compare the time length of active labor in women attempting VBAC compared with nulliparas or multiparas, and then, provide further insight for better management of labor.
From January 1999 to December 2003, a total of 444 patients with VBAC were entered into the study. Women with two or more history of caesarean section or previous vaginal delivery were all excluded from the study. Time length of active labor in these patients was compared with 335 nulliparas and 218 multiparas consecutively visiting our unit for delivery in 2003.
For patients with VBAC, the duration of active and second phase were 184.8+/-115.7, and 25.1+/-15.2 minutes, which was significantly shorter than nulliparas (p<0.05), but longer than multiparas (p<0.05). To eliminate confounding factors affecting the duration, 374 women without use of vacuum, oxytocin, or epidural anesthesia were selected for analysis. Consistently, the time length of active and second phase in women with VBAC was significantly shorter than in nulliparas, but longer than in multiparas (p<0.001) except for active phase compared with nulliparas (p=0.295).
With regard to the time length of active labor, women attempting VBAC were in the intermediate group when compared with nulliparas or multiparas. Understanding of this unique time interval in women attempting VBAC may help in allowing an appropriate management for labor process.


VBAC; Length of labor; Active phase; Second phase
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