What medical procedure is used when a person's heart or lungs have stopped working?

• A. Defibrillation
• B. Oxygen therapy
• C. CPR
• D. Intubation

Answer: (C)

When the heart or lungs stop, the immediate goal is to keep blood moving and oxygen reaching the body until professional help arrives. The procedure designed for this situation is CPR, which combines chest compressions to maintain circulation with rescue breaths to provide oxygen. This manual act buys time and helps preserve brain and organ function while advanced care is sought. Defibrillation is a separate step used to shock certain abnormal heart rhythms and isn’t the blanket solution for every arrest. Oxygen therapy helps with oxygen levels but doesn’t restart circulation. Securing the airway with intubation is important during resuscitation, but the overarching procedure used when heart or lungs have stopped is CPR.