How is 'rescue breathing' defined and when is it used?

Rescue breathing is defined as a life-saving technique where breaths are delivered to a victim who is not breathing. This method is specifically employed in situations where the individual has no pulse, indicating that they are in a state of cardiac arrest or respiratory failure. The aim of rescue breathing is to provide the necessary oxygen to the person’s lungs, which can aid in maintaining vital organ function until further medical assistance can be provided or until spontaneous breathing returns.

Effective rescue breathing involves ensuring the airway is open and using proper techniques to deliver breaths appropriately – typically mouth-to-mouth or with a barrier device. It is a critical component of cardiopulmonary resuscitation (CPR) when performed in conjunction with chest compressions.

Other choices do not accurately describe the specific application of rescue breathing. Techniques that focus on preventing hyperventilation or assisting conscious individuals are part of diver safety but fall into different categories of emergency response. Additionally, clearing a diver's airway is a separate procedure that specifically addresses underwater environments but is not categorized under rescue breathing.