Shoulder dystocia: a study of 47 cases

Area of Science:

• Obstetrics and Gynecology
• Perinatal Medicine
• Fetal Development

Background:

• Shoulder dystocia complicates 0.2% of vaginal deliveries, presenting significant antenatal prediction challenges.
• Risk factors include prolonged labor, regional analgesia, and operative vaginal delivery, though causality is not definitively established.
• High immediate maternal and fetal morbidity, including neural or bony injuries in 30% of infants, underscores the severity of this complication.

Purpose of the Study:

• To investigate the incidence and predictability of shoulder dystocia.
• To identify associated risk factors and consequences of shoulder dystocia.
• To evaluate the potential impact of managing postmaturity on shoulder dystocia rates.

Main Methods:

• Retrospective analysis of vaginal delivery cases.
• Identification of antenatal and intrapartum factors associated with shoulder dystocia.
• Assessment of neonatal outcomes and maternal complications.

Main Results:

• Antenatal prediction of shoulder dystocia remains difficult.
• Factors like prolonged labor stages and operative delivery are associated with increased risk.
• Infants born post-term (44%) and macrosomic (70% > 4,000g) are disproportionately affected.
• Significant neural or bony injuries occurred in 30% of affected infants.

Conclusions:

• Post-term pregnancies (beyond 41 weeks) are strongly linked to shoulder dystocia.
• Elective induction of labor at 41 weeks gestation is proposed as a strategy to reduce shoulder dystocia incidence.
• Proactive management of postmaturity may mitigate severe neonatal morbidity associated with shoulder dystocia.