Final answer:
A bag mask should be used by a properly trained individual to provide ventilation during CPR when the victim is not breathing, after being safely removed from a hazardous situation. It is crucial for effective air delivery and preventing additional complications.
Step-by-step explanation:
The only time a bag mask should be used on a victim who needs breaths is when the rescuer is properly trained and when there is no immediate risk of injury to the rescuer or the victim. This kind of device is vital when providing ventilation to an individual who is not breathing or not breathing adequately and requires advanced airway management skills. It is particularly used when giving rescue breaths during CPR, ensuring that oxygen is delivered to the victim's lungs. Proper usage includes ensuring a tight seal around the victim's mouth and nose, as well as providing adequate, yet gentle breaths to prevent injury or further complications like gastric inflation.
Instances, when a bag mask may be essential, include circumstances like drowning, where after the victim is safely removed from the water, the rescuer may need to provide breaths to the victim. Additionally, in cases of chocking where the object causing the obstruction has been cleared, or in situations involving carbon monoxide poisoning where the victim needs to be ventilated after being brought to a safe environment. It is crucial that the bag-mask is used correctly to be effective and to prevent harm.