Abstract P108: Significant Differences in Voice Prompts From Four Commonly Used AEDs
Introduction: Automatic external defibrillators (AED) are generally easily handled, however untrained lay rescuers or rescuers who have limited recollection of their training may experience difficulties operating an AED. To facilitate the use, voice and audio prompts are the accepted standard. The voice prompt is considered a major determinant of correct and successful application. The objective of this study was to compare voice prompts from four commonly used AEDs.
Materials and methods: Two AEDs, Zoll AED+ Plus (Zoll Medical, Chlemsford, Massechuttes, USA) and Powerheart AED G3 (Cardiac Science Inc., Irvine, California, USA), and two AED training units, Lifepak CR+ (Medtronic, Minneapolis, USA) and Heartstart HS-1 (Philips Medical System, Andover Seattle, USA), were included in the study. Each AED and AED training unit were recorded on video during a mock cardiac arrest scenario. One of the investigators followed the voice prompt in real time without delay during shockable and non-shockable rhythms. Subsequently, the recorded voice prompts were entered into a standardised evaluation form.
Results: One AED instructed using a female voice while the remaining devices used a male voice. Two AEDs directed the user to activate the EMS, while one AED instructed the user to ensure that the EMS had been activated. Only two AEDs instructed the user to remove clothing from the patient’s chest. All prompts included different instruction on how to place defibrillation electrodes on the patient’s bare chest. Furthermore, directions to stand clear during heart rhythm analysis and the delivery of shock differed among all AEDs. Time to first shock varied among AEDs [range: 63–90 sec]. Instruction to begin CPR differed: “start CPR”, “start chest compressions and rescue breaths” and “start CPR, give 30 compressions then give two breaths”. One voice prompt included the initial steps of the basic life support algorithm, another AED offered instructions in CPR, while one AED offered active feedback for chest compressions.
Conclusions: We demonstrate significant differences in the voice prompts from four commonly used AEDs in terms of content and terminology. This may have implications for the use of AEDs.