Defining the upper limit of the second stage of labor in nulliparous patients

Background Increased duration of the second stage of labor provides clinical challenges in decision-making regarding the optimal mode of delivery that minimizes maternal and neonatal morbidity. Objective In a large cohort of uncomplicated nulliparous singleton cephalic labors, we sought to examine the effect of increasing duration of second stage on delivery and perinatal outcome. Study Design The GENESIS Study recruited 2336 nulliparous...