Does cardiopulmonary resuscitation really work? What is survival rate?

Much less than on TV. Most americans' understanding of CPR efficacy is gained from tv dramas- 77% portrayed as surviving cardiac arrest (ca). In reality, survival rates are poor: less than 10% survive ca outside of the hospital & less than 20% survive an arrest even if it occurs in the hospital. Survival rates for terminal or chronically ill people are 0-5%. Survival doesnt always mean a return to quality of life.
Yes it works. Not sure of the survival rate, but can make the difference between life and death.