The Importance of Fetal Station in the First Stage of Labor.

OBJECTIVE: This study aimed to examine the relationship of fetal station in the first stage of labor to labor curves and cesarean delivery rates among patients presenting in spontaneous labor.

STUDY DESIGN: Labor curves for patients with non-anomalous singletons who presented in spontaneous labor to our hospital's Obstetric Triage Unit with intact membranes from January 1, 2012 to August 31, 2016 were reviewed. Cervical exams and time of exam were obtained for each patient from presentation to triage until delivery. Station for each presentation and cervical dilation was estimated using a random effects model and the slope of cervical station change was calculated to estimate the change in dilation by hour. Perinatal outcomes, including cesarean delivery rates, were examined according to fetal station at initial presentation. Factors known to affect labor curves-epidural analgesia, infant birthweight, maternal habitus, and parity-were also examined.

RESULTS: 8123 patients presented in spontaneous labor with intact membranes. For patients presenting at 6 centimeters dilation, the rate of change of labor was significantly different when identified to have a station greater than 0 (+1 and more caudad) when compared to those with -1 and more cephalad station (both P <0.001). This relationship persisted when analyzed according to epidural analgesia, birthweight, maternal habitus, and parity. The frequency of cesarean delivery was significantly higher for patients presenting in spontaneous labor with negative fetal station (P <0.05). When stratified across all dilation (3-9 centimeters), this trend remained significant (P <0.001).

CONCLUSION: In the first stage of labor, advanced fetal station was significantly associated with differing labor curves, and positive fetal station was significantly less likely to result in cesarean delivery. Physical examination, including station, remains a critical element in labor management.