- 著者
- Tomokazu Motomura Hisashi Matsumoto Kunihiro Mashiko Hirotoshi Ishikawa Tetsuya Nishimoto Yoshihiro Takeyama
- 出版者
- The Medical Association of Nippon Medical School
- 雑誌
- Journal of Nippon Medical School (ISSN:13454676)
- 巻号頁・発行日
- pp.JNMS.2020_87-406, (Released:2020-03-31)
- 被引用文献数
- 5
IntroductionTo increase survival rates among patients with severe trauma from road traffic accidents, Japan launched the D-Call Net (DCN) system for dispatching doctors by helicopter utilizing Advanced Automatic Collision Notification technology in November 2015. As of October 2019, DCN has dispatched doctors 4 times.CasesCase 1: Canceled because trauma was mild. Case 2: Doctor made contact with 2 patients with moderate trauma 29 min earlier than would have occurred conventionally. This was the first case of doctor dispatch and patient treatment based on automotive engineering information worldwide. Case 3: An accident involving 3 severely injured patients activated DCN, enabling doctor-patient contact 20 min earlier than would have been possible conventionally. Case 4: DCN was utilized ineffectively.DiscussionAccording to 2008 data from Chiba Prefecture, in accidents where victims sustained severe trauma, the time from accidence occurrence to hospital arrival was 67 min, even with doctor dispatch by air ambulance ("Doctor-Heli" [DH]). Accident information for faster doctor dispatch effectively improved survival rates. An algorithm was developed to assess trauma severity (severity probability) based on accident information. DCN dispatches doctors based on information, including accident site and severity probability, that is sent to smartphones of doctors, reducing the time from accident to DH request by approximately 17 min.DCN is the world's first system for faster doctor dispatch to traffic accident sites based on automotive engineering information. It is crucial for improving survival rates and mitigating aftereffects.
- 著者
- Hiroyuki TAKAO Dai WATANABE Satoshi TANI Hiroki OHASHI Tosihiro ISHIBASHI Kohei TAKESHITA Shigeyuki MURAKAMI Tetsuya NISHIMOTO Kohei YUGE Kostadin KARAGIOZOV Toshiaki ABE Yuichi MURAYAMA
- 出版者
- The Japan Neurosurgical Society
- 雑誌
- Neurologia medico-chirurgica (ISSN:04708105)
- 巻号頁・発行日
- pp.oa.2021-0149, (Released:2021-10-14)
- 参考文献数
- 18
- 被引用文献数
- 1
A simulation model was developed to better understand the mechanisms of brain injuries in sports. A three-dimensional model comprising approximately 1.22 million elements was constructed from cranial computed tomography images of adult male volunteers by the voxel method. To simulate contact sports that permit actions such as tackling, a sinusoidal wave with duration of 10 ms and maximum acceleration of 2000 m/s2 was applied to the lowest point of the model to apply rotational acceleration to the head from different directions. The von Mises stress was then observed at five points in the coronal plane of the brain: cingulate gyrus (CG), corpus callosum (CC), brain stem (BS), lateral temporal lobe (LT), and medial temporal lobe (MT). LS-DYNA universal finite element analysis software with explicit time integration was used for the analysis. Concentrations of stress started to appear in the CC and BS at 10 ms post-impact, after which they also became evident in the CG and MT. The maximum changes in stress at each location occurred 10–15 ms post-impact. The von Mises stress was 9–14 kPa in the CG, 8–24 kPa in the CC, 12–24 kPa in the BS, 7–12 kPa in the LT, and 12–18 kPa in the MT. The highest stress in every part of the brain occurred after lateral impact, followed by oblique impact and sagittal impact. Such simulations may help elucidate the mechanisms of brain injuries in sports and help develop measures to prevent chronic traumatic encephalopathy.