Values of volume of dead space at rest and during exercise in heart failure patients and healthy subjects with no additional dead space and with 250 mL and 500 mL of additional dead space.

Data are presented as means ± SD; DS =  dead space; H =  healthy subjects; HF =  heart failure patients; NS =  not significant; VDYint =  dead space volume calculated as VEYint/RRYint; VDmeas =  dead space volume measured by PaCO2 in heart failure patients and estimated by PETCO2 in healthy subjects.
αp<0.001 versus VDmeas 6′; Ω p<0.05 versus VDmeas 6′; ¥ p<0.05 versus VDmeas 6′; μ p< 0.001 versus VDmeas 8′; ® p<0.01
versus VDmeas peak; ρ p<0.001 versus VDmeas 2′; ∞ p<0.001 versus VDmeas 4′; € p<0.001 versus VDmeas 6′;
£p<0.001 versus VDmeas 8′; © p<0.001 versus VDmeas peak.