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Perform CPR for two minutes. Remember CAB. Position your hands for the compressions. Perform 30 compressions. Make sure the airway is open. Give two rescue breaths. Repeat the cycle of 30 chest compressions and two breaths. Use an AED.
Once you have quickly assessed the situation and checked the consciousness and circulation of the victim you need to act very quickly. If there is no pulse you must begin CPR immediately, and continue it for two minutes (which is about five cycles of CPR) and then call for Emergency Medical Services. If you are alone it is important to start CPR before calling for help. If someone else is there send them for help. If you are alone, do not call until you have completed two minutes of CPR. Dial your local emergency number. Call 911 in North America, 000 in Australia, 111 in New Zealand, 112 by cell phone in the EU (including the UK) and 999 in the UK. If possible, send someone else to get an AED (Automatic External Defibrillator) if there is one in the building or nearby. CAB is the basic process of CPR. It stands for Chest Compressions, Airway, Breathing. In 2010, the recommended sequence changed with chest compressions placed before airway opening and rescue breathing. Chest compressions are more critical for correcting abnormal heart rhythms (ventricular fibrillation or pulseless ventricular tachycardia), and because one cycle of 30 chest compressions only requires 18 seconds, airway opening and rescue breathing are not significantly delayed. Chest compressions, or hands-only CPR is recommended if you have not been properly trained or are worried about performing mouth-to-mouth resuscitation on a stranger. When performing CPR on a child the positioning of your hands is especially important, given that a child will be more fragile than an adult. Locate the child's sternum by moving two fingers to the bottom of the rib cage. Identify where the lower the ribs meet in the middle and then place the heel of your other hand on top of your fingers. Just use the heel of this hand to do the compressions. Compress the chest, with elbows locked, by pushing straight down about 2 inches (5.1cm) deep. The smaller body of a child needs less pressure than an adult would. If you begin to hear or feel a cracking sound, that may indicate that you are pushing too hard. Continue, but apply less pressure with the compressions. Do 30 of these compressions, and do them at a rate of at least 100 compressions per minute if you are the only rescuer. Allow complete chest recoil after each compression. Minimize pauses in chest compression that occur when changing providers or preparing for a shock. Attempt to limit interruptions to less than 10 seconds. If there are two rescuers, each should complete a round of 15 compressions. Place your hand on the victim's forehead and two fingers on his chin. Lift the chin gently with the two fingers while carefully pushing down on the forehead with your other hand. If you suspect a neck injury, gently pull the jaw upward rather than lifting the chin. Once you have done this you should look, listen and feel for breathing. Put your ear close to the victim's mouth and nose and listen carefully for any signs of life. Watch for chest movement and feel for any breath on your cheek. If there are no signs of life, place a breathing barrier (if available) over the victim's mouth. Keeping the airway open, take the fingers that were on the forehead and pinch the victim's nose closed. Make a seal with your mouth over the victim's mouth and breathe out for about one second. Make sure you breathe slowly, as this will make sure the air goes in the lungs not the stomach. Make sure you keep your eye on the victim's chest. If the breath goes in, you should see the chest slightly rise and also feel it go in. If the breath goes in, give a second rescue breath. If the breath does not go in, reposition the head and try again. If it does not go in again, the victim may be choking. You'll need to do more chest compressions in this case. Keep in mind abdominal thrusts (the Heimlich maneuver) should only be performed on someone who is conscious. You should do CPR for two minutes (five cycles of compressions to breaths) before checking for signs of life, a pulse or breathing. Continue CPR until someone takes over for you; emergency personnel arrive; you are too exhausted to continue; an AED is attached, charged, and the person running it asks you to clear the body; or pulse and breathing return. Don't forget to call the emergency services after the first two minutes of CPR. After you call them, continue to administer CPR until they arrive. If an AED becomes available, turn on the AED, place the pads as instructed (one over the right chest and another over the left side). Allow the AED to analyse the rhythm, and give one shock if indicated, after clearing everyone from the patient (yell "CLEAR!" first). Resume chest compressions immediately after each shock for another 5 cycles before reassessing. If the victim begins breathing, gently manoeuvre them into the recovery position.