Background: Since 2005, dispatcher-assisted cardiopulmonary resuscitation (DA-CPR) was started in Japan. Several notices about the request to the implement of DA-CPR from Fire and Disaster Management Agency had been announced to all of the fire departments. However, the transition effect of DA-CPR for out-of-hospital cardiac arrest patients (OHCAs) has not been verified. Purpose: To evaluate the ten-year transition of the favorable neurological outcomes by dispatcher-assisted cardiopulmonary resuscitation in Japan. 
Method: A cohort study using 1,176,363 OHCAs from Japan’s nationwide Utstein-style registry between 2005 and 2014. Eligible 204,204 adults with bystander-witness of cardiogenic arrests were analyzed. The cases divided into four groups (i.e., CPR with DA, CPR without DA, Non-CPR with CPR and Non-CPR without DA). The number of patients in whom survival with favorable cerebral function was attributable to DA-CPR was estimated. Multivariable logistic regression was applied to evaluate the effect of DA-CPR to good cerebral functions (CPC1-2). 
Result: The number of receiving CPR with DA increased from 3,323 (19.6%) in 2005 to 8,257 (35.6%) in 2014. The patients who were survival with favorable cerebral function also improved from 125(20.7%) in 2005 to 840(44.1%) in 2014(adjusted odds ratio based on 2005, 3.08; 95% confidence interval, 2.53-3.78). The estimated number of survivors with favorable cerebral function was attributable to DA-CPR increased from 35 in 2005 to 481 in 2014. 
Conclusion: The result showed that increased the number of DA-CPR by the efforts of FDMA influenced with a progressively improved in the number of survivors with favorable cerebral function after the experience of OHCAs in Japan. The systematic education for dispatchers is expected to improve long-term outcome after OHCAs further.

7 - The ten-year transition of the favorable neurological outcomes by dispatcher-assisted cardiopulmonary resuscitation in Japan.