Core Viewpoint - The article highlights the importance of Automated External Defibrillators (AEDs) in improving survival rates for out-of-hospital cardiac arrest patients, emphasizing the successful case of a resident in Haikou who was saved due to timely CPR and AED use. Group 1: AED Deployment and Impact - Haikou has deployed 3,100 AEDs across various public locations since 2018, including transportation hubs, schools, and community centers, ensuring that residents can find an AED within 500 meters in urban areas [1][2] - The survival rate for cardiac arrest patients can significantly increase if high-quality CPR is initiated within 4 minutes and AED is used within 3 to 5 minutes, with survival probabilities reaching 50% to 70% [2] Group 2: Emergency Response and Training - The timely arrival of emergency services is crucial; in the case of the resident, the nearest ambulance took 20 minutes to arrive, highlighting the importance of immediate AED access [2] - Haikou is enhancing its emergency response capabilities by developing a digital management platform for AEDs, allowing citizens to locate nearby devices through a WeChat mini-program [3] - The Haikou 120 Emergency Center plans to train over 13,000 individuals in emergency response by 2025, indicating a growing emphasis on community preparedness [3]