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How should rescue breaths be delivered to avoid overinflation?

Deliver gentle breaths that produce visible chest rise, avoiding excessive force.

Rescue breaths should be delivered gently enough to produce visible chest rise, not with forceful or rapid breaths. The idea is to provide enough air to ventilate without inflating the lungs or stomach too much. Overinflation raises intrathoracic pressure, can push air into the stomach (risking vomiting and aspiration), and makes it harder for blood to return to the heart, which can reduce the effectiveness of CPR. Focus on a smooth breath that takes about a second, and watch for the chest to rise with each breath. If the chest doesn’t rise, adjust airway position or the seal (or switch to an appropriate ventilation device) to deliver the right amount of air. The emphasis is on gentle, quality breaths rather than fast or forceful ones.

Deliver rapid, forceful breaths.

Deliver breaths only if there is a pulse.

Deliver breaths through the mouth only.

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