These three updated recommendations clarify the previous recommendations based on the the lay rescuer’s level of training.
For adults in OHCA, untrained lay rescuers should provide chest compression–only CPR with or without dispatcher assistance. (Class I; LOE C-LD)
For lay rescuers trained in chest compression–only CPR, we recommend they provide chest compression–only CPR for adults in OHCA. (Class I; LOE C-LD)
For lay rescuers trained in CPR using chest compressions and ventilation (rescue breaths), it is reasonable to provide ventilation (rescue breaths) in addition to chest compressions for the adult in OHCA. (Class IIa; LOE C-LD)