The rate of chest compressions, rescue breathing, breaths per minute, depth, and ratio are all important factors when performing CPR according to the AHA guidelines.
If the victim has a pulse but not breathing, you need to open the airway by doing a head tilt, chin lift, or jaw thrust maneuver if the victim has a spine injury. Then pinch the nose shut and give the first rescue breath, lasting for 1 second. The correct ventilation rate for adults is 10 to 12 breaths per minute. Ensure the chest rises and falls with each breath.
It is necessary to perform CPR on an unconscious child with no pulse, breathing, or gasp. When performing CPR on a child, you must strictly follow the American Heart Association guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. The target rate for chest compressions for a child is 100-120 compressions per minute.
According to the American Heart Association guidelines, the recommended CPR ratio for adults is 30:2, regardless if there are 1 or 2 rescuers. This is because you must perform 30 chest compressions every two rescue breaths. In addition, the heart received better blood perfusion delivering oxygen because of the 30 compressions.
An AED can only be used on someone with Tachycardia or a rapid heart rate. You cannot use it on victims with an extremely slow heart rhythm or those whose heart stops beating. When you attach the electrode pads to the victim's chest, the AED will determine whether the victim's heart needs an electric shock or not.
American Heart Association (2020). Hands Only CPR - Adult & Child [Online]. Available from https://www.heart.org/en/health-topics/cardiac-arrest/hands-only-cpr