TABLE 1.

TWO-COMPARTMENT WASHOUT ANALYSIS IN TRACER-RETAINING AND NONRETAINING REGIONS

	FQ̇		sV̇a		R2
	Baseline	BC	Baseline	BC	Baseline	BC
TR
Slow	0.201 ± 0.170	0.659 ± 0.119*	0.017 ± 0.007	0.004 ± 0.002*	0.997 ± 0.003	0.984 ± 0.021
Fast	0.799 ± 0.170	0.341 ± 0.119*	0.078 ± 0.026	0.069 ± 0.032
NR
Slow	0.257 ± 0.216	0.244 ± 0.126	0.019 ± 0.007	0.015 ± 0.006†	0.997 ± 0.002	0.994 ± 0.007
Fast	0.743 ± 0.216	0.756 ± 0.126	0.076 ± 0.028	0.092 ± 0.023*

Definitions of abbreviations: BC = bronchoconstriction; F_Q̇ = fraction of perfusion to fast and slow compartments; NR = non–tracer-retaining region of interest; sV̇a = specific alveolar ventilation (s⁻¹); TR = tracer-retaining region of interest.

^*p < 0.05 compared with baseline.

^†p < 0.05 compared with TR.