A 32-year-old G2P1 at 39 weeks of gestation is in the second stage of labor. Following a 2-hour active pushing phase, the fetal head delivers but immediately retracts firmly against the maternal perineum. The anterior shoulder does not deliver with gentle downward traction. The obstetrician diagnoses shoulder dystocia and instructs the patient to stop pushing while requesting immediate assistance from anesthesia, pediatrics, and additional nursing staff.
Arrange the following obstetric interventions in the most appropriate sequential order of implementation, proceeding from initial first-line management to maneuvers of last resort.
- 1Hyperflex the maternal hips against the abdomen
- 2Perform internal extraction of the posterior fetal arm
- 3Intentionally fracture the fetal anterior clavicle
- 4Replace the fetal head into the vagina and perform a cesarean delivery
Answer
The correct sequential order for managing shoulder dystocia is: 1) Hyperflex the maternal hips (McRoberts maneuver), 2) Perform internal extraction of the posterior arm, 3) Intentionally fracture the fetal clavicle, 4) Replace the fetal head and perform a cesarean delivery (Zavanelli maneuver).
The correct order follows the principle of escalating invasiveness and morbidity risk. First-line management involves external maneuvers like the McRoberts maneuver. If unsuccessful, clinicians proceed to internal maneuvers like delivering the posterior arm. If these fail, intentional clavicular fracture is a rescue technique. The Zavanelli maneuver (cephalic replacement) is an extreme measure of last resort due to high maternal and fetal complication rates.
Step-by-Step Solution
Key Concept
Management of shoulder dystocia follows a strict stepwise progression from least invasive external maneuvers (McRoberts, suprapubic pressure) to internal manipulations (posterior arm extraction, rotational maneuvers), followed by rescue destructive maneuvers (clavicle fracture), and finally maneuvers of last resort (Zavanelli).