Abstract 285: Does the Real-Time Audio Feedback From an Automated External Defibrillator Enhance Cardiopulmonary Resuscitation Quality During Emergency Resuscitation?
Objective: The 2010 AHA guidelines have outlined the importance of providing early high-quality CPR in conjunction with an AED to enhance survial outcomes post sudden cardiac arrest. However, there is little information available as to how real-time feedback may positively enhance the quality of compression rates. The purpose of this study was to evaluate the impact of CPR feedback given by out-of-hospital (OOH) responders following SCA. Response to feedback was gauged by analysing changes in the impedance cardiogram (ICG) and ECG waveforms recorded by the AED during OOH resuscitation in an attempt to establish if the rescuer responded to audible instruction.
Methods: Data was collected from events recorded by HeartSine Samaritan AEDs over a five month period. A total of nine events were received and assessed. Event files that included the ECG and ICG recordings were downloaded using SaverEvo® Software and analysed. Data also included the time of each instruction, the nature of the instruction (e.g. push harder, push faster, push slower, good compressions) and the associated changes in the ECG and ICG waveforms were interpreted to assess reaction times where appropriate.
Findings: A total of 177 instructional CPR prompts were given to the rescuers over nine events, 70 (39.5%) of which resulted in a positive modification of CPR rate or force. On average there was a 1.44 second delay in reaction time to each prompt. Of the 70 positive changes in the ICG, 30 of the cases showed a corresponding change in the ECG indicating that the ICG is a better indicator of CPR efficacy.
Conclusions: This study demonstrates that real-time feedback during CPR is beneficial in enhancing the quality of CPR in emergency resuscitation. Even where there was no response to the prompt, CPR at least continued at the same rate suggesting that there was no detrimental affect on the quality of CPR. Furthermore, the results indicate that ICG is an effective way to monitor the quality of rescuer CPR.
- © 2013 by American Heart Association, Inc.