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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: J Allergy Clin Immunol. 2009 Dec;124(6 Suppl):S78–S83. doi: 10.1016/j.jaci.2009.10.002

Figure 2.

Figure 2

Figure 2

Figure 2A. Lung attenuation curves before (baseline, solid black line) and 6 (dashed black line) and 22 (dot-dashed grey line) hours after cat room challenge (CRC). At 6 hours and to a lessor degree at 22 hours there is an increase in airtrapping. A left shift in the lung attenuation curve indicates more airtrapping. HU = Hounsfield units. CRC = Cat room challenge.

Figure 2B. Lung attenuation curves before (solid lines) and after (dashed lines) methacholine before (baseline, black lines) and 22 hrs after (grey lines) cat room challenge. Methacholine causes an increase in airtrapping (left shift in lung attenuation). However, 22 hours after cat room challenge, methacholine produces a further increase in airtrapping. HU = Hounsfield units. CRC = Cat room challenge. MCT = methacholine challenge test.