Several Automated Chest Compression devices are now available for CPR. Physio-Control really had the market cornered with the Lucas for the longest time. Are you using one of these devices?
We've been doing a long term trial on both the Lucas and the Autopulse. Three of each rotating through trucks though predominantly our outlying stations. Have used both in arrests, prefer the Autopulse but would be fine with either. Not sure if we'll see their use expanding in my area as we currently dispatch two Ambulances to all arrests with FD dispatched but typically only doing compressions for us there may just not be enough of a business case to warrant a fleet wide purchase.
We had the autopulse for years, but recently got rid of them. The batteries were expensive and difficult to maintain (they needed to be cycled often to maintain a charge), and it was usually too much trouble setting it up (since the patient must be placed atop the unit just right). Oh, and they had a pretty low weight/girth limit.
I do not now of any ambulance service in Australia or New Zealand which currently has mechanical CPR.
They are incredibly expensive (at approximately NZ$20,000 each) so unjustifiably unaffordable.
There is also no evidence they improve outcomes.
I do however, really like what London is doing with them, using them for CPR en-route to a catheter lab for people who are most likely to benefit from early PCI during cardiac arrest. It is touted such a concept may evolve here, but it will probably be in the major urban areas and is still going to be I would guess two to three years away.
I would like them to deal with manpower shortages. While they do no show better outcomes over normal CPR, when we have two people on scene I bet the Lucas would do a lot better.