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In what scenario should a lifeguard use the non-rebreather mask?

When providing hydration to a victim

When providing supplemental oxygen to a victim experiencing respiratory distress

A non-rebreather mask is specifically designed to deliver supplemental oxygen to a victim who is experiencing respiratory distress. This device provides a high concentration of oxygen while allowing the patient to breathe in oxygen enriched air and exhale carbon dioxide, ensuring that they receive the necessary oxygen to improve their condition.

In scenarios of respiratory distress, the goal is to restore adequate oxygenation to the victim, and the non-rebreather mask is optimal because it can deliver a significant amount of oxygen (typically 10-15 liters per minute) while minimizing the risk of rebreathing exhaled air. Other options listed involve situations where the use of a non-rebreather mask would not be appropriate, such as hydrating a victim, performing CPR, or when a victim is conscious and breathing normally, where supplemental oxygen is not typically required.

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While performing CPR on an unresponsive victim

When a victim is conscious and breathing normally

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