Table 3 Valved holding chamber type; their volumes; and drop in oxygen percentage from 21% air per actuation
From: Asthma pressurised metered dose inhaler performance: propellant effect studies in delivery systems
Spacer type | Volume (ml) | 1 puff (O2 %) | 2 puffs (O2 %) | 10 puffs (O2 %) |
|---|---|---|---|---|
Ablespacer™ | 126 | 19 | 17 | 11 |
Vortex™ | 180 | 19 | 18 | 13 |
BabyHaler™ | 393 | 20 | 19 | 16 |
Volumatic™ | 788 | 20 | 19 | 17 |