During non-gaseous anaesthesia or gaseous anaesthesia in conjuction with anaesthetic machine. During recovery from anaesthesia. Longer term assistive, mask applied. Iron lung for poliomyelitis. Controlled ventilation Ventilator runs as set by the controls, independent of subject.
Volume is integral of flow.
Pressure is related to volume by the pressure volume curve of the lungs. In this case PEEP shown as zero. May be combined with mandatory ventilation if interval is too long. Supply gas to maintain this if pressure drops due to inspiration. Vent to atmosphere during expiration.