What is the primary purpose of a bag-valve-mask (BVM)?

The primary purpose of a bag-valve-mask (BVM) is to assist ventilation in cases of respiratory arrest. When an individual is unable to breathe adequately on their own, the BVM allows a rescuer to provide positive pressure ventilation. By sealing the mask over the patient's face and squeezing the bag, the rescuer can deliver oxygen directly into the lungs, which is crucial in situations where normal breathing has ceased. This form of mechanical assistance is essential for restoring oxygen flow to vital organs and preventing irreversible damage due to hypoxia.

The other choices do not align with the primary function of a BVM. While administering medication and assessing respiratory rate are important components of emergency response, they are not functions performed by a BVM. Similarly, airway suctioning is a different procedure that involves clearing the airway, which may be necessary in some cases but does not utilize a BVM. The BVM specifically supports ventilation, making it a critical tool in situations of respiratory failure.