An artificial respiration system (100), comprising:- a helmet (10) provided with a container body (11), in which a patient's head can be accommodated, provided with an open end, an elastically yielding collar (12) which can be sealingly coupled to the patient's neck and adapted to close the open end of said container body (11), inflow means (17) of at least a first breathable gas within a volume enclosed by the container body (11) and by the collar (12) connectable to a first supply circuit (170) of the first breathable gas； and outflow means (18) from which the gases exhaled by the patient come out of said volume； and- a nasal cannula (20) provided with a flexible tube (21) at a first end whereof a nasal dispenser (22) is fixed for the administration of a second breathable gas directly into a patient's nose and a flexible tube (21), in which at least one portion of the flexible tube (21) and the nasal dispenser (22) of the nasal cannula (20) are arranged inside the volume enclosed by the container body (11) and by the collar (12) of the helmet (10).
