If 100% oxygen is not available, use rescue breathing to support respiration. Rescue breathing involves the steps below.
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Make sure airway (mouth/throat) is not blocked
Tilt the head back and pinch the nose closed
Place your mouth over the person’s mouth to make a seal and give 2 slow breaths
The person’s chest should rise (but not the stomach)
Follow up with one breath every 5 seconds
Be Ready to Rescue