Ishikawa Natsuko, Tomita Keisuke, Shimazui Takashi, Tochigi Yoko, Nakada Taka-Aki
Department of Emergency and Critical Care Medicine Chiba University Graduate School of Medicine Chiba Japan.
Smart119 Inc. Chiba Japan.
Acute Med Surg. 2024 Nov 5;11(1):e70017. doi: 10.1002/ams2.70017. eCollection 2024 Jan-Dec.
This study investigated the correlation between the number of emergency medical service (EMS) dispatches and response time extension. In addition, we conducted a simulation to assess the potential for reducing response times by relocating the ambulance based on the number of dispatches.
This retrospective observational study analyzed data on patients treated with EMS between May 1 and June 25, 2021, in an urban area (Chiba City, Japan). Spearman's rank correlation tests were used to analyze the correlations among the number of dispatches, response time extension, and ambulance distance. We created a heat map to visualize the number of dispatches and distribution of emergency case occurrences, and simulated the relocation of the EMS team with the lowest number of dispatches to the closest EMS team with the highest number of dispatches.
In total, 7915 emergency cases were included. The median response time across all dispatches was 9 min, whereas that for the response time extension cases was 12 min. There was a significant positive correlation between the increased number of dispatches, response time extension ( = 0.94, < 0.0001), and ambulance distance ( = 0.95, < 0.0001). The relocation simulation significantly shortened the average response time from 13 min and 30 s to 12 min and 11 s (9.9% decrease, < 0.0001).
An increased number of dispatches significantly increased the response time extension cases and ambulance distance. Our simulation suggests that EMS relocation can potentially shorten the response time. While increased dispatches influence the response time extension, optimal EMS allocation may improve response times.
本研究调查了紧急医疗服务（EMS）调度次数与响应时间延长之间的相关性。此外，我们进行了一项模拟，以评估根据调度次数重新部署救护车来减少响应时间的可能性。
这项回顾性观察研究分析了2021年5月1日至6月25日在日本千叶市市区接受EMS治疗的患者数据。使用Spearman秩相关检验来分析调度次数、响应时间延长和救护车距离之间的相关性。我们创建了一个热图来直观显示调度次数和紧急病例发生的分布情况，并模拟将调度次数最少的EMS团队重新部署到调度次数最多的最近的EMS团队。
总共纳入了7915例紧急病例。所有调度的中位响应时间为9分钟，而响应时间延长病例的中位响应时间为12分钟。调度次数增加、响应时间延长（r = 0.94，p < 0.0001）和救护车距离（r = 0.95，p < 0.0001）之间存在显著正相关。重新部署模拟显著缩短了平均响应时间，从13分30秒缩短至12分11秒（减少9.9%，p < 0.0001）。
调度次数增加显著增加了响应时间延长的病例数和救护车行驶距离。我们的模拟表明，EMS重新部署有可能缩短响应时间。虽然调度次数增加会影响响应时间延长，但优化EMS分配可能会改善响应时间。
