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First perform an Initial Assessment. Open the airway, Check for breathing, if there is no breathing give two rescue breaths. If the rescue breaths go in and make the chest clearly rise check for a pulse. IF there is no pulse begin CPR.
To check for a response from an unconscious person, start by gently tapping their shoulder and asking loudly, "Are you okay? Can you hear me?" If there is no response, try to assess their breathing and pulse. If they are not breathing or do not have a pulse, begin CPR and call for emergency medical assistance immediately.
For an Adult, if there are no signs of life, immediately go to CPR. For an Infant or Child, if there is no breathing, but a pulse start rescue breathing; 1 breath every 3 seconds.
Check to see if they have a pulse, or are breathing. If they have both, no CPR is needed. If they have a pulse but aren't breathing, you can perform rescue breathing only without chest compressions. If they do not have a pulse and aren't breathing, you perform rescue breathing and chest compressions.
You would only administer CPR if the person does not have a pulse or (at a slightly lower place on the chest) if you knew/believed the person was choking. Otherwise, if the person has a pulse but is not breathing, you should administer rescue breaths.
The rescuer at the head performs the rescue breathing and checks the pulse during compressions to confirm they are effective.
If there is a pulse, then perform rescue breathing only.
No. Monitor the pulse, and give rescue breathing if needed.
CPR for the lay person, denoted just CPR, there is no longer a pulse check for an adult, so once CPR is started, it will be continued unless the person begins to show signs of life. In CPR-FPR (CPR for the Professional Rescuer) there is still a circulation check, so RB at 1 breath / 5 seconds is part of that certification. To specifically answer your question, most people would do CPR and not check for a pulse on an adult, because it is not part of the curriculum. For a professional person, they would perform rescue breathing with a pulse and CPR without a pulse.
Agonal breathing will not support life; rescue breathing (or CPR if no pulse) is required.
That rate is not enough to sustain life. Rescue breathing must be started and if there becomes no pulse, CPR must be started.
An infant in need of CPR will be unconscious, not breathing and have no pulse.