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Difficulty: MediumObstetric Complications

A multiparous patient (G3P2) at 40 weeks of gestation is in the active pushing phase of labor. Her pregnancy was complicated by gestational diabetes. Following the emergence of the fetal head, it promptly retracts against the perineal tissue (turtle sign). Standard downward traction is unsuccessful in delivering the anterior shoulder. The attending clinician immediately calls for assistance.

Arrange the following obstetric interventions in the most appropriate sequential order for managing this complication, starting from the recommended initial maneuver to the procedure of last resort.

  1. 1Instruct the patient to sharply hyperflex her thighs against her abdomen
  2. 2Apply firm, downward manual pressure directly over the maternal symphysis pubis
  3. 3Insert a hand into the vaginal canal to grasp and deliver the posterior fetal arm
  4. 4Push the fetal head back into the pelvis and prepare for emergent cesarean delivery

Answer

The correct sequence for managing shoulder dystocia is the McRoberts maneuver, followed by suprapubic pressure, internal maneuvers such as delivery of the posterior arm, and finally cephalic replacement (Zavanelli maneuver) if all else fails.
Shoulder dystocia is an acute obstetric emergency requiring a protocol-driven, stepwise approach. Once help is called, the first intervention is the McRoberts maneuver (hyperflexion of the maternal hips), often paired with suprapubic pressure, which collectively resolve most cases by altering the pelvic diameter and dislodging the anterior shoulder. If these external maneuvers fail, internal maneuvers such as delivering the posterior arm or performing the Woods corkscrew are attempted to manually reduce the fetal shoulder diameter. When all standard external and internal maneuvers fail, last-resort salvage procedures like the Zavanelli maneuver (replacing the fetal head into the vagina to allow for cesarean delivery) are utilized.

Step-by-Step Solution

1
Recognize the clinical signs of shoulder dystocia
The turtle sign (retraction of the fetal head) and failure of standard downward traction indicate the diagnosis.
Prompt recognition is essential to rapidly initiate the emergency algorithm and minimize the risk of fetal hypoxic injury.
2
Initiate first-line external maneuvers
Perform the McRoberts maneuver and apply suprapubic pressure.
These techniques are non-invasive, quick to execute, and resolve the vast majority of shoulder dystocia cases.
3
Proceed to internal maneuvers if external techniques are unsuccessful
Attempt to deliver the posterior fetal arm or perform rotational maneuvers.
Internal maneuvers actively reduce the fetal bisacromial diameter and physically alter the position of the impacted shoulders.
4
Execute salvage procedures as a last resort
Perform cephalic replacement (Zavanelli maneuver) followed by an emergency cesarean delivery.
This intervention carries significant maternal and fetal morbidity and is strictly reserved for refractory cases.

Key Concept

The stepwise management of shoulder dystocia prioritizes non-invasive external maneuvers (McRoberts, suprapubic pressure) before progressing to internal maneuvers (delivery of posterior arm) and finally extreme salvage procedures (Zavanelli maneuver).
Estimated Time:1m 30s
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Topics

Obstetric Complications

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