elapsed time between turning on device and first chest compression elapsed time between turning on device and first delivered shock elapsed time between turning on device and first delivered shock in case of shockable rhythm compliance with 2 minutes long CPR period recognition of rhythm, recognition of adequate therapy, follow-up of the protocol concernig DC-shock recording the exact moment of the following procedures (with the use of Code Marker button on the defibrillatior device) endotracheal intubation drug therapy obtaining intravenous access oxygen therapy