From the Guidelines
This patient requires an operative vaginal delivery using forceps or vacuum assistance due to prolonged second stage of labor, which is defined as pushing for more than 3 hours in a nulliparous woman with epidural anesthesia, as evidenced by the American Journal of Obstetrics and Gynecology study 1.
Key Considerations
- The patient has been pushing for 4 hours, exceeding the recommended time frame, and is exhausted, which increases the risk of maternal and fetal complications.
- The fetal head is at +3 station, and the cervix is completely dilated, indicating a favorable position for delivery.
- The left occiput anterior position is optimal for delivery, and the fetal heart rate tracing is category 1, indicating a reassuring fetal status.
- The estimated fetal weight is 3.4 kg (7.5 lb), which is not excessively large, and the patient has no chronic medical conditions or complications during pregnancy.
Management Approach
- Before proceeding with operative vaginal delivery, the epidural anesthesia should be optimized to ensure adequate pain control while allowing some sensation for pushing.
- The obstetrician should explain the procedure to the patient, obtain consent, and prepare for a possible cesarean delivery if operative vaginal delivery is unsuccessful.
- Oxytocin augmentation may also be considered to strengthen contractions, as suggested by the study 1, which found that oxytocin infusion can enhance uterine contractions and promote progress in cervical dilatation.
- The study 1 also emphasizes the importance of thorough cephalopelvimetry to exclude the presence of cephalopelvic disproportion (CPD), which is a significant concern in cases of prolonged second stage labor.
Rationale
- Prolonged second stage labor increases the risks of maternal complications, such as infection and hemorrhage, and fetal complications, such as asphyxia.
- Operative vaginal delivery is a safer and more effective option than continuing to push, especially given the patient's exhaustion and the favorable fetal position.
- The study 1 supports the use of operative vaginal delivery in cases of prolonged second stage labor, highlighting the importance of careful evaluation and management to minimize risks and ensure a successful outcome.
From the Research
Management of Prolonged Second Stage of Labor
The patient has been pushing for 4 hours and is exhausted, with no complications during pregnancy and no chronic medical conditions. The estimated fetal weight is 3.4 kg, and vital signs are normal, with a category 1 fetal heart rate tracing.
Risks and Outcomes
- A study published in 2019 2 found that allowing a longer duration of the second stage of labor decreased the rate of primary cesarean delivery, but increased the rate of operative vaginal deliveries, third- and fourth-degree lacerations, and shoulder dystocia.
- A systematic review published in 2023 3 compared maternal and perinatal morbidity, mortality, and other adverse outcomes after vacuum extraction versus second-stage cesarean section, and found that vacuum extraction should be the recommended mode of birth to prevent unnecessary cesarean sections and reduce perinatal and maternal deaths.
- A narrative review published in 2016 4 found that extending the second stage of labor beyond current guidelines decreased the incidence of cesarean delivery by 55% and did not increase maternal or neonatal risks.
- A study published in 2002 5 found that a prolonged second stage of labor was not associated with low Apgar scores, umbilical artery pH levels, or admission to the NICU, but was associated with an increased rate of maternal blood loss and third-degree anal sphincter tears.
Guidelines and Recommendations
- The World Health Organization recommends allowing 2-3 hours for the second stage of labor 6.
- The American College of Obstetricians and Gynecologists and the Society for Maternal-Fetal Medicine recommend allowing a longer duration of the second stage of labor to decrease the rate of primary cesarean delivery 2.
- Choosing between cesarean section and assisted vaginal birth to overcome delayed second stage requires relevant skill and experience 6.