The effect of the Barnum maneuver in reducing the obstructing part of the fetal shoulder
The effect of the Barnum maneuver in reducing the obstructing part of the fetal shoulder
The operator has already inserted a hand into the vagina and delivered the posterior arm by sweeping it across the fetal chest, and thus delivered the posterior shoulder as well (not shown). A 13-cm bisacromial diameter becomes an 11-cm axillo-acromial diameter upon delivery of the arm.