The best replacement for assist control is simv.

The best alternatives to assist control are rated as following:
★★★★★  simv
★★★  volume control
★★★  intermittent mandatory ventilation
★★★  cmv
★★★  pressure control
★★  prvc
★★  pressure support

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Speaking about assist control, one probably shouldn't forget about pressure support.

Other search terms related to assist control and their ratings are:
★★★★★ pressure support
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assist control
simv
volume control