Collateral ventilation demonstrated by helium transfer.
D000818:Animals; D004285:Dogs; D006371:Helium; D007440:Intubation; D008168:Lung / Q000502:physiology*; D008722:Methods; D010100:Oxygen; D011312:Pressure; D012119:Respiration; D013147:Spirometry
D006371:Helium; D010100:Oxygen