Compression to ventilation ratio8/15/2023 ![]() Continue CPR until there are signs of movement or emergency medical personnel take over.If an AED isn't available, go to step 5 below. If you're not trained to use an AED, a 911 operator or another emergency medical operator may be able to give you instructions. Give one shock, then resume chest compressions for two more minutes before giving a second shock. As soon as an automated external defibrillator (AED) is available, apply it and follow the prompts.Resume chest compressions to restore blood flow.Be careful not to provide too many breaths or to breathe with too much force. Thirty chest compressions followed by two rescue breaths is considered one cycle. If the chest doesn't rise, repeat the head-tilt, chin-lift maneuver and then give a second breath.If the chest rises, give a second breath.Give the first rescue breath - lasting one second - and watch to see if the chest rises. After opening the airway (using the head-tilt, chin-lift maneuver), pinch the nostrils shut for mouth-to-mouth breathing and cover the person's mouth with yours, making a seal.Current recommendations suggest performing rescue breathing using a bag-mask device with a high-efficiency particulate air (HEPA) filter. Rescue breathing can be mouth-to-mouth breathing or mouth-to-nose breathing if the mouth is seriously injured or can't be opened. Then with the other hand, gently lift the chin forward to open the airway. Put your palm on the person's forehead and gently tilt the head back. ![]() If you're trained in CPR and you've performed 30 chest compressions, open the person's airway using the head-tilt, chin-lift maneuver. If you have been trained in CPR, go on to opening the airway and rescue breathing.
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