650 are currently in the midlands alone.
Community groups are being urged to register all defibrillators in their area.
There are currently over 650 of the equipment in Laois, Offaly and Westmeath, with 4,000 on the database nationwide.
Community Engagement Manager with the National Ambulance Service, Ger O'Dea, says registering the defibs makes them easier to find:
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