Efficacy of a Heat Exchanger Mask in Cold Exercise-Induced Asthma

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Presentation transcript:

Efficacy of a Heat Exchanger Mask in Cold Exercise-Induced Asthma Beuther David A. , MD, Martin Richard J. , MD, FCCP CHEST Volume 129, Issue 5, Pages 1188-1193 (May 2006) DOI: 10.1378/chest.129.5.1188 Copyright © 2006 The American College of Chest Physicians Terms and Conditions

Figure 1 Cold air testing apparatus. Cold air is produced by an expansion valve and delivered to the front of the mask through an overlying continuous positive airway pressure (CPAP) mask. Inhaled air temperature is measured at the front of the heat exchanger mask. CHEST 2006 129, 1188-1193DOI: (10.1378/chest.129.5.1188) Copyright © 2006 The American College of Chest Physicians Terms and Conditions

Figure 2 Individual changes in FEV1 with cold air exercise in study 1. Solid bars represent the placebo exercise; striped bars represent the active device exercise. The active heat exchanger mask is highly effective, particularly in subjects demonstrating a > 10% decline in FEV1 with placebo exercise. CHEST 2006 129, 1188-1193DOI: (10.1378/chest.129.5.1188) Copyright © 2006 The American College of Chest Physicians Terms and Conditions

Figure 3 Mean percentage change in FEV1 and FEF25–75 after cold air exercise in study 2. Solid bars represent placebo exercise, striped bars represent the active device exercise, and shaded bars represent the albuterol pretreatment exercise. CHEST 2006 129, 1188-1193DOI: (10.1378/chest.129.5.1188) Copyright © 2006 The American College of Chest Physicians Terms and Conditions