Final answer:
The question concerns the use of CPR, specifically high-quality chest compressions, on a 2.5-year-old child named Sadie who weighs 28 pounds.
Step-by-step explanation:
The question about Sadie pertains to the health emergency technique known as cardiopulmonary resuscitation (CPR). When a person's heart stops, CPR can be lifesaving by maintaining blood flow to vital organs, especially the brain. For a 2.5-year-old child weighing 28 pounds, the correct technique is critical. High-quality chest compressions should be between 5 cm deep and at the rate of 100 compressions per minute (equivalent to the beat of 'Staying Alive' by the Bee Gees), focusing on compressions rather than artificial respiration and using a one-hand technique if necessary.