Nationwide public-access defibrillation in Japan

Area of Science:

• Cardiology
• Public Health
• Emergency Medicine

Background:

• The effectiveness of public-access automated external defibrillators (AEDs) in improving survival rates for out-of-hospital cardiac arrest (OHCA) remains uncertain.
• Assessing the impact of widespread AED dissemination on patient survival is crucial for public health strategies.

Purpose of the Study:

• To evaluate the impact of nationwide public-access AED dissemination on survival rates following OHCA.
• To determine the association between AED availability and patient outcomes, specifically 1-month survival with minimal neurologic impairment.

Main Methods:

• A prospective, population-based observational study was conducted in Japan from 2005 to 2007.
• Included consecutive OHCA patients receiving attempted resuscitation by emergency responders.
• Multivariate logistic regression analysis was used to identify factors associated with favorable neurologic outcomes.

Main Results:

• Over 312,000 OHCA patients were analyzed; 12,631 had witnessed ventricular fibrillation (VF) cardiac arrests.
• Public-access AED shocks were administered in 3.7% of VF cases, increasing with AED availability (1.2% to 6.2%).
• Survival with minimal neurologic impairment at 1 month was 14.4% for all witnessed VF arrests, but 31.6% for those receiving AED shocks. Early defibrillation significantly improved outcomes (aOR 0.91 per minute reduction).

Conclusions:

• Nationwide public-access AED deployment in Japan led to earlier defibrillation by laypersons.
• The study demonstrated a significant increase in 1-month survival with minimal neurologic impairment after OHCA.
• Increased AED availability correlated with reduced time to shock and improved patient survival rates.