The best replacement for defib is pacemaker.

The best alternatives to defib are rated as following:
★★★★★  pacemaker
★★★★★  cardiovert
★★★  cardioversion
★★  afib
  monophasic

Your alternative for defib is not listed? Suggest!
Speaking about defib, one probably shouldn't forget about pacemaker.

Other search terms related to defib and their ratings are:
★★★★★ pacemaker
You have in mind a companion for defib and it is not yet here? Propose!



Google Trends

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defib
pacemaker
cardiovert