Adult Mouth-to-Mask and Bag-Mask Ventilation

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BLS mouth to mask adult A
BLS mouth to mask adult B
BLS mouth to mask adult C

Figure 5

Adult Mouth-to-Mask Ventilation

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 head-tilt or chin-lift. (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 14c).
  5. Practice using the bag valve mask; it is essential to forming a tight seal and delivering effective breaths.

Adult Bag-Mask Ventilation in Two-Rescuer CPR

BLS bag mask adult A
BLS bag mask adult B
BLS bag mask adult C

Figure 6

If two people are present and a bag-mask device is available, the second rescuer is positioned at the victim’s head while the other rescuer performs high-quality chest compressions. Give 30 high-quality chest compressions.

  1. Deliver 30 high quality chest compressions while counting out loud (Figure 6a).
  2. The second rescuer holds the bag-mask with one hand using the thumb and index finger in the shape of a “C” on one side of the mask to form a seal between the mask and the face, while the other fingers open the airway by lifting the person’s lower jaw (Figure 5b).
  3. The second rescuer gives two breaths over one second each (Figure 6c).
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