Out-of-hospital cardiac arrest in apparently healthy adults younger than 40 years ranges from 4 to 14 per 100 000 person-years worldwide. Among young adults who have had cardiac arrest outside of a hospital, only 9% to 16% survive to hospital discharge. Author Zian Tseng, MD, MAS, University of California, San Francisco, discusses this and more with JAMA Associate Editor David L. Simel, MD, MHS. Related Content: