I understand the idea that the neg pressure of the iron lung is beneficial - but what about mobility? If you have someone with a trach on a positive pressure vent, they can get up and move around, go places, etc. How is skin care managed in the iron lung? As an RN of 45 yrs, the MA-1's were soooo awesome! We would pull up the old Emerson's from the basement for stable patients when we got low on MA-1's. The Emerson's were like having an old washing machine in the room.