Abstract 124: An AED Is Not an AED: Extreme Variation in No-Flow Fraction, Perishock Pause and Time to First Shock Among Different Commercially Available Public Access Defibrillators
Out of hospital cardiac arrest (OHCA) requires immediate basic life support (BLS) to prevent death and permanent brain damage. Patients suffering a shockable cardiac rhythm need early defibrillation. In many countries public access defibrillators are established. However, no studies have investigated differences in the no-flow fraction (NFF) and the peri-shock pause between PAD.
Objective: To evaluate the NFF, peri-shock pause, and time to 1st shock in a five minutes simulated cardiac arrest scenario with persistent shockable rhythm.
Methods: We evaluated seven commercially available PAD (Heartsave PAD, Metrax/Germany; Heartstart HS1, Philips/The Netherlands; Lifeline VIEW AED, defibtech/USA; Powerheart G5 AED, Cardiac Science/USA; FRED easy Life, Schiller/Switzerland; AED plus, Zoll/USA; LIFEPAK CR Plus, Medtronic/USA). In this pilot study an instructor in BLS/PAD performed single rescuer BLS using a Code Blue III advanced life support manikin (Gaumard Scientific/USA). The pre-scripted scenario was an adult patient with OHCA and persistent shockable rhythm. We measured the time to 1st shock, the NFF (fraction of time without chest compressions divided by the time without perfusing rhythm) and the peri-shock pause. The results were compared to a standard BLS scenario without the use of an AED.
Results: We found considerable differences among the tested AEDs regarding the CPR quality. Furthermore, many of the devices did not meet the demands of the current international guidelines (table 1).
Conclusion: The algorithms and user guidance of the AEDs should be reconsidered to reduce the NFF and to allow high quality BLS. Further research is necessary to study the usability of AEDs when used by lay rescuers.
- Automated external defibrillator (AED)
- Cardiac arrest
- Ventricular fibrillation
Author Disclosures: C. Poenicke: Other Research Support; Modest; Material (AED and electrodes) contributed by each company where AED has been included in the study. M. Kurth: None. T. Neidel: None. B. Lauterwald: None. N. Papkalla: None. A. Pfältzer: None. T. Koch: None. M. Müller: None.
- © 2014 by American Heart Association, Inc.