Bystander CPR is one of the main independent factors contributing to better survival after out-of-hospital cardiac arrest. Simultaneously, the rate of bystander CPR in Germany is below the European average. First responder applications (apps) contribute to reducing the time period without CPR (no-flow time) until professional help can arrive on-scene. The KATRETTER app was introduced in Berlin as one of the first apps in Europe which do not require any medical qualifications to register as a first responder. The activation of volunteer first responders for suspected cardiac arrest cases through the Berlin Emergency Medical Services integrated control center was evaluated based on data collected between 16 Oct 2020 and 16 Oct 2022. Our descriptive analysis includes the number of registered first responders, number of activations, the number and percentages of accepted activations, as well as all reports where first responders arrived at the scene. As of 15 Oct 2022, a total of 10,102 first responders were registered in the state of Berlin. During this specified period, there were 16.505 activations of the system for suspected out-of-hospital cardiac arrest. In 38.4% of the accepted cases, first responders documented patient contact, and in 34.6% of cases with patient contact, CPR was performed. Only 2% of registered first responders did not have any medical qualifications. Smartphone-based first responder applications should not be understood as a means of alerting professional help, but rather like a digitally amplified “call for help” in the vicinity of an emergency location. A large number of first responders can be recruited within 24 months, without large-scale public relations work necessary. No qualifications were required to become a first responder, contributing to a low-threshold registration process with the effect of a more widespread distribution of the app and cost reduction during implementation.

中文翻译：

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基于应用程序的院前心脏骤停急救人员自动激活：对柏林 KATRETTER 系统 16,500 次激活的分析

旁观者心肺复苏是院外心脏骤停后改善生存的主要独立因素之一。与此同时，德国的旁观者心肺复苏率低于欧洲平均水平。急救人员应用程序 (app) 有助于缩短在专业帮助到达现场之前无需进行心肺复苏 (CPR) 的时间（无流量时间）。 KATRETTER 应用程序在柏林推出，是欧洲首批不需要任何医疗资格即可注册为急救人员的应用程序之一。根据 2020 年 10 月 16 日至 2022 年 10 月 16 日期间收集的数据，对通过柏林紧急医疗服务综合控制中心激活疑似心脏骤停病例的志愿者急救人员的情况进行了评估。我们的描述性分析包括注册急救人员的数量、激活的数量、已接受激活的数量和百分比，以及急救人员到达现场的所有报告。截至 2022 年 10 月 15 日，柏林州共有 10,102 名急救人员登记。在此特定时期内，系统因疑似院外心脏骤停而激活了 16.505 次。在 38.4% 的受理病例中，急救人员记录了患者接触情况，在 34.6% 的患者接触病例中进行了心肺复苏。只有 2% 的注册急救人员没有任何医疗资格。基于智能手机的急救应用程序不应被理解为提醒专业帮助的一种方式，而应被理解为在紧急地点附近进行数字放大的“求救”。 24 个月内可以招募大量急救人员，无需进行大规模的公关工作。成为第一响应者无需任何资格，有助于实现低门槛的注册流程，从而更广泛地分发应用程序并降低实施过程中的成本。