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Re: Defibrillator

Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>

I did an elective cardioversion yesterday for a heart condition called atrial flutter This is done under a brief anaesthetic . I selected 20 joules first as this low amount is often all that is required. It didn't work as it usually does and the rhythm changed to atrial fibrillation so the shock was repeated at 200J and restored the normal sinus rhythm. The capacitors actually store 500J when fully charged although the settings only go to 360J. (This is an older unipolar unit). I used these caps extensively in my can crushing work. Although these days I use big Maxwell pulsecaps.

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
Hi Jonathan, Jim, all,....
of the defib caps that I have come across look to be in the 5.2 kV
at 34 uFd range but are surprisingly small for that much
energy (high energy density). The "standard" shock settings are
200 and 360 joules, so using the energy formula E= 1/2CV~2,
that means a 34 uFd cap would need to be charged to3430 volts and 4600 volts
to deliver a 200 J and a 360 J shock, respectively.  ..... David Rieben