Shoulder dystocia, also known as shoulder delivery difficulty, occurs when the fetal head has been delivered but the anterior shoulder becomes stuck above the pubic symphysis, preventing further delivery with conventional obstetric techniques.
Factors that may contribute to shoulder dystocia
Macrosomia—a birth weight exceeding 4000 grams. Such fetuses often accumulate thick layers of fat on the shoulders, leading to shoulder delivery difficulty.
Pelvic narrowing—particularly flat pelvises—increase the risk of shoulder dystocia.
Excessive pelvic tilt or a low symphysis pubis position.
Impact of Shoulder Dystocia
When shoulder dystocia occurs and the baby's shoulders become stuck in the birth canal, the umbilical cord may be compressed, cutting off blood supply to the baby. This can have severe consequences for both mother and child:
If the baby cannot be delivered within a few critical minutes, oxygen deprivation may cause intellectual impairment or even death. Additionally, clavicle fractures and brachial plexus injuries are likely to occur.
Prolonged labor may lead to uterine atony or vaginal/cervical lacerations, making postpartum hemorrhage the primary maternal risk. Other common complications include genital tract fistulas and puerperal infections.
Shoulder Dystocia – Difficult to Predict, Requires Urgent Intervention!
Since shoulder dystocia occurs in mothers with normal fetal presentation, it cannot be prevented beforehand. While statistics show that the risk increases with fetal weight, low-weight fetuses are still susceptible. Even for average-weight fetuses, the incidence rate is 0.15%.When this unfortunate situation occurs, doctors typically employ techniques to dislodge the stuck shoulders. In urgent situations where saving the baby's life is paramount, they may even intentionally fracture the baby's clavicle to facilitate delivery.
Expectant Mothers Take Note: "Artificial" Difficult Labor Can Be Avoided
To prevent complications during delivery, both the physical and mental state of the mother are crucial.Expectant mothers should strive to relax and avoid excessive anxiety, as psychological factors can easily lead to "artificial" dystocia. Chinese Study: Difficult Births Linked to Increased Aggression in Infants BBC reports that a research team led by Professor Liu Jianmeng, Deputy Director of the Institute of Reproductive Health at Peking University, indicates that difficult labor processes cause elevated cortisol levels in infants, potentially leading to behavioral issues.
Preventing Difficult Labor
After enduring ten months of pregnancy, expectant mothers naturally look forward to welcoming their newborns into the world. Yet alongside this excitement, some also harbor concerns about the delivery process.