b'Most cardiac arrests happen at home, where a loved one is the first responder.Immediate CPR can double or triple the chance of survival.CARES strengthens every link in the chain of survival. mycares.netFigure 7. Percentage of events that are bystander witnessed, receive bystander CPR, and survive to hospital discharge by arrest location.WITNESS STATUSThe witness status of an arrest has significant implications for patient outcomes, as witnessed arrests have more opportunity for bystander intervention and early delivery of care. Approximately half of arrests were unwitnessed (50.2%), while 37.5% were witnessed by a bystander and 12.3% were witnessed by a 911 Responder (Figure 8). Patients with a bystander witnessed arrest were over three times more likely to survive their event compared to unwitnessed arrests (16.0% vs 4.5%, respectively; p.0001), while patients with a 911 Responder witnessed arrest were approximately four times more likely to survive compared to unwitnessed arrests (18.0% vs 4.5%, respectively; p.0001). Figure 8. Arrest witness status.35'