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The most important part of CPR is to make sure help has been called and is on the way.
See the related link for how to give CPR to an Adult, Child, or Infant. ECC 2005 standardized the ratio for the lay person to 30 compressions / 2 breaths for an Adult, Child, or Infant.
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.
If it's an adult, you should immediatly before CPR. If its a child, you should do CPR for 5 minutes and then call. It's approximately 2 Minutes for the infant or child. ~Jason, just passed his FirstAid/CPR Taining.
Adult CPR is needed for whenever someone needs aid in breathing. Therefore, it can be any age that needs it, as long as the person has a certification in CPR for legal reasons. The word "adult" refers to at least age 18, so adult CPR is CPR for those 18 and over only.
Adult, Child, Infant 1-rescuer CPR is 30 Compressions : 2 Breaths.
Cardio (as in cardiopulmonary resuscitation).
Give CPR for an adult when no signs of life are present or for an infant/child when there is no breathing and no pulse.
Do not stop CPR to check for signs of life in Adult CPR. Continue CPR until help (EMS) arrives or someone takes over.
An adult of course.
It is not possible to give a fish CPR.
You can't give a fish CPR.