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Difficulty: EasyLabor, Delivery, and Puerperium

An obstetric team is attending the delivery of a macrosomic infant at 40 weeks gestation. After the fetal head emerges, it immediately retracts tightly against the mother's perineum. The anterior shoulder remains impacted behind the pubic symphysis despite routine gentle downward traction. Arrange the following management steps in the correct standard sequence of escalation to resolve this complication, from the immediate first response to the maneuver of last resort.

  1. 1Instruct the mother to stop pushing and call for additional obstetrical, pediatric, and nursing assistance
  2. 2Hyperflex the maternal hips tightly against her abdomen (McRoberts maneuver) alongside suprapubic pressure
  3. 3Perform internal manual rotation of the fetal shoulders (e.g., Woods corkscrew maneuver)
  4. 4Perform cephalic replacement followed by emergent cesarean delivery (Zavanelli maneuver)

Answer

The correct sequence is: 1) Call for assistance and instruct the mother to stop pushing, 2) Perform the McRoberts maneuver with suprapubic pressure, 3) Execute internal rotational maneuvers, 4) Perform the Zavanelli maneuver as a last resort.
The widely established protocol for managing shoulder dystocia involves a clear stepwise progression from least invasive to most invasive. The clinician must first recognize the emergency, halt pushing, and mobilize help. The initial physical intervention is the McRoberts maneuver (often coupled with suprapubic pressure), which safely alters maternal pelvic geometry. If external maneuvers fail, the provider escalates to internal vaginal maneuvers (such as the Woods corkscrew or delivering the posterior arm) to manually alter the fetal position. Heroic measures, such as replacing the fetal head to facilitate an emergent cesarean section (Zavanelli maneuver), are strictly reserved for intractable cases where all other maneuvers have failed.

Step-by-Step Solution

1
Identify the clinical presentation as shoulder dystocia.
The retraction of the fetal head against the perineum (turtle sign) confirms the anterior shoulder is impacted behind the maternal pubic symphysis.
Immediate recognition is required to initiate a standardized management protocol and prevent hypoxic injury to the fetus.
2
Determine the initial, non-physical response.
The provider must tell the patient to stop pushing and immediately call for help.
Pushing worsens the impaction. Resolving the dystocia requires a coordinated team (e.g., an assistant to apply suprapubic pressure while the primary provider performs maneuvers).
3
Identify the first-line physical maneuvers.
McRoberts maneuver combined with suprapubic pressure should be performed first.
These external maneuvers alter the maternal pelvic geometry and are successful in relieving a large percentage of shoulder dystocias without requiring internal vaginal manipulation.
4
Identify the secondary interventions if first-line maneuvers fail.
Internal rotational maneuvers (e.g., Woods corkscrew, Rubin) or delivery of the posterior arm are the next steps.
Internal maneuvers directly alter the orientation of the fetal shoulders to bypass the bony obstruction.
5
Identify the maneuver of last resort.
The Zavanelli maneuver (replacing the fetal head into the pelvis to perform a cesarean section) is the final escalation.
Because of significant maternal and fetal morbidity, heroic measures are strictly reserved for cases refractory to all other standard maneuvers.

Key Concept

The management of shoulder dystocia follows a strict, standardized escalation protocol (e.g., HELPERR mnemonic) that begins with calling for help and using noninvasive external maneuvers, progresses to invasive internal maneuvers, and concludes with heroic measures as a last resort.
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Topics

Labor, Delivery, and Puerperium

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