In one-rescuer CPR, breaths should be supplied using a pocket mask, if available.

1. Give 30 high-quality chest compressions.
2. Seal the mask against the person’s face by placing four fingers of one hand across the top of the mask and the thumb of the other hand along the bottom edge of the mask (Figure 5a).
3. Using the fingers of your hand on the bottom of the mask, open the airway using the head-tilt/chin-lift maneuver. (Do not do this if you suspect the person may have a neck injury) (Figure 5b).
4. Press firmly around the edges of the mask and ventilate by delivering a breath over one second as you watch the person’s chest rise. (Figure 5c).