To provide cardiopulmonary resuscitation when using an automated external defibrillator, check the patient to ensure he is unresponsive by either shaking or asking loudly whether he is okay, recommends the National Heart, Lung and Blood Institute. Prepare the AED for use if the person’s breathing and pulse are absent. Perform cardiopulmonary resuscitation for two minutes before using the AED to check the heart rhythm and administer shock to the patient.
To restore blood circulation, perform compressions by placing your hands, one on the other, over the patient’s exposed chest between the nipples, and push straight down, instructs the Mayo Clinic. Make at least 100 compressions a minute. Clear the person’s airway by tilting his head back and raising his chin. Pinch his nostrils, and provide mouth-to-mouth breathing for one second. Thirty compressions and two rescue breaths make a CPR cycle. If the person does not start breathing after five cycles, administer a shock using an AED and resume CPR.
Ensure there are no puddles of water near the unconscious person before using an AED, warns the NHLBI. Turn the AED on, and follow the voice and screen prompts on the device. Place one of the AED’s pads slightly below the left nipple and the other on the right center of the chest. Check for implanted devices, and place the pads an inch away from them to ensure the current flows freely. Press the Analyze button on the AED to monitor the patient’s rhythm before delivering a shock when the device prompts you to do so.