Purpose : We investigated whether or not the emergency medical technicians performed defibrillation immediately for patients with out-of-hospital cardiac arrest (OHCA). When defibrillation was not performed, we also investigated the reason why not.
Method : There were 104 patients with OHCA occurring within Inashiki district of Ibaraki prefecture, Japan between April and September 2007.
Results : In 78 of these 104 patients, we could identify ECG records with a total of 732 analyses. Of these 732 analyses, defibrillation was indicated in 81 times. However, defibrillation was performed on only 29 occasions, and the resumed analyses were interrupted in the remaining 52. Of these 52, the automated external defibrillator (AED) shifted to a message of no shock advice in 15, and a new analysis restarted in 36.
Discussion : Either another message from AED or restart of a new analysis induced a low ratio of defibrillation being performed. We suggested that analysis in situations under vibration during transport by ambulance without a stopping during analysis might lead to this low ratio. Simultaneously, the phenomena observed in this study resulted in serious elongation in the interruption of “continuous” chest compression. Therefore, some countermeasures against these phenomena are needed.
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