Final answer:
When performing one-rescuer CPR, the emphasis is on high-quality chest compressions rather than providing breaths. The hands should be positioned on the sternum and chest should be compressed at a specific depth and rate.
Step-by-step explanation:
When performing one-rescuer CPR, the emphasis is on performing high-quality chest compressions rather than providing artificial respiration. The technique involves applying pressure to the sternum to manually compress the heart and maintain blood flow. The hands should be positioned on the sternum between the lines at T4 and T9, and the chest should be compressed at least 5 cm deep and at a rate of 100 compressions per minute. Breaths are not typically given during one-rescuer CPR, as the focus is on effective chest compressions.