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You will need to start with chest compressions. Kneel down beside the casualty’s chest. Place one hand at the center of the chest and place the heel of the other hand on top and interlock your fingers to lift them off the ribs. Lean over the casualty with your arms straight and press down on the chest to five to six centimeters. Release the pressure. Allow the chest to come back up without removing the hands from your chest. Repeat this to give 30 chest compressions at a rate of 100 to 120 beats per minute.