Which maneuver is typically considered the first line of intervention for shoulder dystocia?

The McRoberts maneuver is the first line of intervention for shoulder dystocia because it effectively alters the pelvic dimensions and helps facilitate the delivery of the shoulder. By having the mother flex her knees tightly against her abdomen, this maneuver helps to increase the angle of the pelvis, which can relieve the impaction of the fetal shoulder against the pubic symphysis. This mechanical change often allows for the successful resolution of shoulder dystocia with minimal risk to both the mother and the infant.

This maneuver is prioritized because it is simple to perform, requires no special equipment, and can lead to a quick resolution, making it a practical and immediate response in an emergency situation. When used promptly, it can significantly reduce the risk of complications associated with prolonged shoulder dystocia.