Table 1.

The number of helium-oxygen gas mixture (heliox) 'responders' for tidal volume, compliance and resistance for each performed including pulmonary function tests after crossover.

	Assessment
	1	2	3	4	CO
Tidal Volume	8/10*	8/10*	8/10*	8/10*	8/8*
Resistance	7/10*	6/10	5/10	8/10*	8/8*
Compliance	8/10*	7/10*	7/10*	2/10	7/8*

CO, positive response after crossover from a nitrogen-oxygen gas mixture (nitrox) to heliox. Note only eight piglets were crossed over. ^*P < 0.05.