The best replacement for heart beat is heartbeat.

The best alternatives to heart beat are rated as following:
★★★★★  heartbeat
★★★★★  pulse
★★  heart rate
★  pulse rate

Your alternative for heart beat is not listed? Suggest!
Speaking about heart beat, one probably shouldn't forget about brain death.

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



Google Trends

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heart beat
heartbeat
pulse