The best replacement for osa is csa.

The best alternatives to osa are rated as following:
★★★★★  csa
★★  iop
★★  sacri
★★  sadi
★  skelly
★  uars
  24\/7
  sonny bamboo
  central sleep apnea

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

Other search terms related to osa and their ratings are:
★★★★★ hypersomnia
★ ohs
★ snoring
You have in mind a companion for osa and it is not yet here? Propose!



Google Trends

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