https://www.redcross.org/take-a-class/resources/articles/abc...
Some experts believe that some situations may see better outcomes if circulation is prioritized over respiration. Most experts agree that it is still best to teach ABC.
The version taught in Australian first aid classes is DRSABCD: check for (D)anger, check for patient (R)esponse, (S)end for help, (A)irway, (B)reathing, (C)irculation.