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[Алексей K-K]

3. Are there times when I should use conventional CPR with breaths?
Yes. There are many medical emergencies that cause a person to be unresponsive and to stop breathing normally. In those emergencies, conventional CPR that includes mouth-to-mouth breathing may provide more benefit than Hands-Only CPR. The American Heart Association recommends CPR with a combination of breaths and compressions for:
All infants (up to age 1)
Children (up to puberty)
Anyone found already unconscious and not breathing normally
Any victims of drowning, drug overdose, collapse due to breathing problems, or prolonged cardiac arrest

4. Why don’t teens or adults who suddenly collapse need mouth-to-mouth breathing in the first few minutes after their cardiac arrest?
When a teen or adult suddenly collapses with cardiac arrest, his or her lungs and blood contain enough oxygen to keep vital organs healthy for the first few minutes, as long as someone provides high-quality chest compressions with minimal interruption to pump blood to the heart and brain.
When a teen or adult suddenly collapses with cardiac arrest, the cause is usually an abrupt onset of an abnormal heart rhythm. A common abnormal rhythm causing sudden cardiac arrest is ventricular fibrillation (VF). VF causes the heart to quiver so it doesn’t pump blood. Before a sudden collapse, the teen or adult was probably breathing normally. This means there may be enough oxygen in the person’s blood for the first several minutes after cardiac arrest.
Many cardiac arrest victims have gasping, which could bring some oxygen into the lungs. If the victim’s airway is open, allowing the chest to expand back to its normal position after each compression may also bring some oxygen into the lungs.
For these reasons, the most important thing someone near the victim can do for a person in sudden cardiac arrest is to pump blood to the brain and to the heart muscle, delivering the oxygen that still remains in the lungs and blood. Do this by giving high-quality chest compressions with minimal interruptions. Interruptions in compressions to give mouth-to-mouth breaths may bring some additional oxygen into the lungs, but the benefit of that oxygen can be offset if you stop the blood flow to the brain and heart muscle for more than a few seconds (especially in the first few minutes after a sudden cardiac arrest when there is still plenty of oxygen in the lungs and blood).

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[Алексей K-K]