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. 2009 Jun 11;10(1):48. doi: 10.1186/1465-9921-10-48

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Copyright © 2009 Invernizzi et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tests group 1. Particle frequency of BDP-HFA pMDI delivered in ambient air (open columns) and in ETS (black columns). Particles sized 0.3–1.0 μm, which predominated in ambient air, were no longer measurable in ETS, particles in the range of 1.0 to 3.0 μm in diameter being mostly represented.