The best replacement for pacing is trotting.

The best alternatives to pacing are rated as following:
★★★★★  trotting
★★★  cardioversion
★★  defibrillation
★★  ventricular pacing
★★  event pacing
★★  gaiting
★  synchronized cardioversion
★  transvenous
★  lv pacing
★  transvenous pacing
★  non demand pacing
  asynchronous pacing
  narrative pacing

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Speaking about pacing, one probably shouldn't forget about lifepak 12.

Other search terms related to pacing and their ratings are:
★★★★★ lifepak 12
defibrillator
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pacing
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