Which device is considered best for a single rescuer performing rescue breathing?

The pocket-face mask is considered the best option for a single rescuer performing rescue breathing due to its design and functionality. It allows the rescuer to provide effective ventilation while minimizing the risk of exposure to bodily fluids. The pocket-face mask is lightweight and portable, making it easy to carry and use in emergency situations.

This device creates a seal over the patient's mouth and nose, which helps deliver breaths more effectively compared to other devices. The one-way valve ensures that expired air from the patient does not escape through the mask, allowing the rescuer to provide positive pressure ventilation without inhaling any potentially infectious materials.

In contrast, a bag-valve mask, while effective for providing oxygen, generally requires two rescuers for optimal use: one to maintain the seal on the face and the other to squeeze the bag. Oxygen masks are typically used in conjunction with oxygen supplies and are not as effective for a single rescuer who needs to provide rescue breathing quickly. A rescue breathing tube is not a standard device for this purpose either and is less common in emergency settings. Thus, the pocket-face mask stands out as the most practical and effective tool for a single rescuer performing rescue breathing.