Behaviour of three resuscitators under hyperbaric conditions

Three portable resuscitators were tested under hyperbaric conditions--the Pneupac Ventilator/Resuscitator, the Motivus Resuscitator (Type P.V.),and the Stephenson Minuteman Resuscitator. The first two delivered an inadequate tidal volume at 2 ATA. The third, while delivering a constant tidal volume, did so at an increasingly inadequate ventilatory frequency.