The misconception of using floating patterns as an accurate means of measuring the contents of metered-dose inhaler devices

McFadden, 1995, Improper patient technique with metered dose inhalers: clinical consequences and solutions to misuse, J Allergy Clin Immunol, 96, 278, 10.1016/S0091-6749(95)70206-7 Williams, 1993, Problems in assessing contents of metered dose inhalers, BMJ, 307, 771, 10.1136/bmj.307.6907.771 Shultz, 1995, Drug delivery characteristics of metered-dose inhalers, J Allergy Clin Immunol, 96, 284, 10.1016/S0091-6749(95)70207-5 Weinstein, 1998, When should your asthmatic patients refill their MDI propelled with chlorofluorocarbons?, Del Med J, 70, 293 Azmacort, 2000, 2546 Leach, 1995, Preclinical safety of propellant HFA-134a and Airomir (salbutamol sulphate in CFC-free system), Br J Clin Pract, 79, 10 Proventil, 2000, 2834 Flovent, 2000, 1186