During CPR, what should the nurse do first if the chest is not moving while attempting to ventilate?

In a situation where chest movement is not observed during ventilation, repositioning the head is critical because it ensures that the airway is properly aligned and open. The correct head tilt-chin lift maneuver can help overcome any potential obstructions and facilitate effective breathing.

If the airway is not patent, it could lead to inadequate ventilation, which impacts the effectiveness of CPR. Reassessing the head position is essential as it might revert the airway to a position that allows air to flow into the lungs properly. Maintaining an open airway is the first priority during CPR, and ensuring that the head is positioned correctly can often solve issues of inadequate air movement.

While other options such as checking for foreign bodies, administering back blows, or performing a finger sweep are certainly important in other scenarios involving airway obstruction, the immediate priority in this context is to confirm that the airway is open through proper positioning.