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A Comparison of AEDs

Early access to defibrillation is critical to saving victims of sudden cardiac arrest. Before purchasing an AED you MUST thoroughly evaluate its reliability, ease-of-use, innovative AED technology and the service or training options offered by the manufacturer.

The technical information for this AED comparison was derived from the operator's manuals provided with each AED and other publicly available sources.


Manufacturer Cardiac Science
Medtronic Philips Zoll
Product Model LifePak CRPlus HeartStart OnSite AED Plus
Requires user initiated testing No Yes Yes Yes
Electrodes tested for presence Yes No Yes Yes
Electrodes tested for functionality Yes No Yes No
Visible battery capacity gauge Yes No No No
Status indicator Visual and audible Visual Visual and audible Visual and audible
Buttons to operate 1 2 3 2
Pre-connected electrodes Yes Yes Yes Yes
Non-polarized electrodes (interchangeable) Yes No Unknown No
Text display Yes No No Yes
Additional electrode placement prompts Yes Yes Yes No
Enhanced CPR prompts Yes No Yes Yes
Biphasic Technology        
Energy protocol options Yes Yes No Yes
First shock efficacy 100% 100% Unknown 99%
Analysis algorithm        
Programmable VF/VT rate, detection rate Yes, 120-240 bpm No, 120 bpm Yes, 160-600 bpm depending on parameters No, 150 bpm
Asystole threshold (mV) 0.08 0.08 0.10 0.10
Noise (artifact) detection during analysis Yes Yes Yes Yes
Non-committed shock Yes No Yes No
Monitor heart rhythm during CPR (option) Yes No No No
Optional SVT therapy Yes No No No
Synchronized shock Yes No No No
Pacemaker pulse detection Yes No Yes No
Added Features        
Internal memory for ECG data 60 minutes 20 minutes 15 minutes 20 minutes
Compatible with manual defibrillators Yes Yes Yes Yes
Pediatric Capability Yes Yes Yes Yes
Pediatric electrodes Yes Yes Yes Yes
AED warranty 7 years 5 years for commercial and consumer and 1 year for EMS 5 years 5 years
Unconditional battery warranty (full operational replacement) 4 years 90 days not offered none if purchased through consumer, 1 year from factory

1. As indicated in FDA approval submissions.

2. For the Philips product, publicly available data from the FDA approval process was for a 115J and 130J energy protocol waveform, which had an 86% first shock efficacy (Bardy GH, et al., Circulation, 1996;94:2507-2514). Philips claims the current energy protocol for the OnSite product is a 150J waveform. No known data exists in comparable electrophysiology laboratory clinical settings for this waveform.

3. Philips does not specify whether their electrodes are or are not polarized. Each pad indicates that it should be placed in a specific location on the torso (OnSite owners manual, REF: 011667-0005 page 14).

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