The best replacement for atn is ain.

The best alternatives to atn are rated as following:
★★★★★  ain
★★★  aki
★★★  armasight
★★★  clg
★★★  flir
★★★  yukon
★★  prerenal
★★  itt
★  night optics
★  arf
★  hrs
★  rta
★  clg battle of the atlantic
★  yukon night vision
  mystik
  yukon night vision scope
  pre renal

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

Other search terms related to atn and their ratings are:
★★★★★ fena
★★★ acute renal failure
★★★ renal failure
★ oliguria
You have in mind a companion for atn and it is not yet here? Propose!



Google Trends

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atn
ain
aki