The best replacement for defib is pacemaker.

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

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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!

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Scale is based on the average worldwide traffic of defib in all years. Click on graph for more.