Influence of the duration of the second stage of labor on fetal pH levels and oxidative status in uncomplicated pregnancies

Abstract

The duration of the second stage of labor up to 3 h does not influence lipid peroxidation in the fetoplacental circulation in uncomplicated pregnancies.

Influence of second stage of labor duration on umbilical artery lactate levels in uncomplicated multiparous women

“…Some reported that a prolonged second stage was an independent predictor of adverse neonatal outcomes such as acidemia, [4][5][6] while others found it to be no serious disadvantage to the fetus. [7][8][9] In our earlier small-scale study, a second stage of labor duration of < 3 hours did not influence fetal umbilical cord acid-base status, lactate status, or oxidative status in uncomplicated nulliparous women. 9) Although second stage of labor duration has been reported to be shorter in multiparous women than in nulliparous women, 10) how this impacts obstetric outcomes has not been clarified.…”

“…[7][8][9] In our earlier small-scale study, a second stage of labor duration of < 3 hours did not influence fetal umbilical cord acid-base status, lactate status, or oxidative status in uncomplicated nulliparous women. 9) Although second stage of labor duration has been reported to be shorter in multiparous women than in nulliparous women, 10) how this impacts obstetric outcomes has not been clarified. Against this backdrop, we examined the relationship between second stage of labor duration and lactate levels in umbilical arterial blood as a reflection of fetal acidosis in uncomplicated multiparous women.…”

“…The influence of second stage of labor duration on obstetric outcomes has been widely studied, with inconsistent results. [4][5][6][7][8][9][12][13][14] Some earlier studies have suggested that a prolonged second stage leads to increased adverse outcomes in multiparous women and is thus an independent risk factor for adverse maternal and neonatal outcomes. 12,13) Chen et al 13) reported that a second stage of labor duration of ≥ 3 hours in multiparous women was associated with increased risks of instrumental delivery, peripartum morbidity, and undesirable neonatal outcomes.…”

Does a longer second stage of labor worsen umbilical artery blood gas parameters in newborns?—a retrospective cohort study of 2,140 cases

“…Neonatal umbilical artery blood gas analysis (UABGA) combined with the Apgar score is currently an effective indicator for the diagnosis of fetal distress, neonatal metabolic acidosis, neonatal brain injury, and adverse neonatal outcomes. The pH, base excess (BE), and lactate parameters in UABGA are the most visual indicators of metabolic acidosis in newborns ( 5 - 7 ).…”