A shoulder dystocia occurs during a vaginal delivery. After McRoberts manoeuvre and suprapubic pressure fail, the obstetrician delivers the posterior arm. This is correctly described as:

• A Rubin II manoeuvre
• B Woods screw manoeuvre
• C Jacquemier's manoeuvre ✓
• D Lovset's manoeuvre

Explanation

Delivery of the posterior arm (Jacquemier's manoeuvre) reduces the shoulder-to-shoulder diameter that is impacted and allows delivery. The manoeuvre involves reaching into the vagina, locating the posterior arm, sweeping it across the fetal chest and delivering it. Rubin II involves posterior pressure on the anterior shoulder; Woods screw involves anterior pressure on the posterior shoulder; Lovset's is used in breech delivery for extended arms.

Reference: Williams Obstetrics, 26th ed.

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Written and medically reviewed by the StethoPrep medical team.