When performing bag-mask ventilation with two rescuers, what is the first step?

When performing bag-mask ventilation with two rescuers, positioning is crucial for effective and safe ventilation. The first step is for one rescuer to position themselves directly above the patient's head. This positioning allows the rescuer to have optimal access to the airway and facilitates the proper placement of the mask over the patient's face, which is essential for achieving a good seal. A secure mask fit ensures that breaths are effectively delivered into the lungs rather than escaping into the surroundings, enhancing the efficiency of the ventilation process.

Being positioned at the head also enables the rescuer to clearly see the chest rise and fall with each breath, providing immediate feedback on the effectiveness of ventilation. It allows for better communication between the two rescuers, where one can focus on ventilation while the other can provide chest compressions or assist with airway management. Therefore, proper positioning is foundational for successful bag-mask ventilation.