What signifies that rescue breaths are being delivered effectively?

The effectiveness of rescue breaths is indicated by visible chest rise with each breath provided. When administering rescue breaths, it is crucial that the air reaches the lungs, and one of the primary signs that this is happening is the rise and fall of the chest. This indicates that the breaths are adequately inflating the lungs, allowing oxygen to enter the bloodstream, which is vital for maintaining the patient's life until further help can arrive. If the chest does not rise, it may suggest that the airway is obstructed or that the breaths are not being given with sufficient force or at an appropriate angle.

The other situations, such as a lack of chest rise, a deepening state of unconsciousness, or prolonged breaths, would not signify effective rescue breaths and could indicate problems with the airway or ventilation technique being used.