Scientific respiratory symposium, paris june 2010.

Lung deposition studies demonstrate a clear trend for greater deposition with smaller particle size, with the ultra-fine particle in HFA-BDP (Qvar ® ) resulting in deposition rates in excess of 50% of the dose, while the 3.5 μm particles of BDP-CFC can result in deposition rate as low as 4%. 6 , 7 Air-trapping, measured as lung attenuation, has be

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