This study provides new insights about ethnic differences in airway responsiveness and EWDs. Asian-Pacific Islanders required a significantly smaller dose of MCh to achieve a PC(30) compared to the other three ethnic groups. The upper airway EWDs used by African Americans, Asian-Pacific Islanders, and Hispanic-Mexican Americans indicate a shared language of symptoms. A new language of breathlessness that incorporates both cultural and ethnic differences is needed to address the present disparity in the management of asthma symptoms.
The way, or ways, in which asthmatics recognize specific symptom(s) with varying degrees of their airway obstruction, or asthma severity, is poorly understood. Our purpose was to gain a better understanding of how asthma patients during acute episodes, based on their symptom perception, decide when to seek symptom relief. A cross-sectional design was used to study 32, 16 per group, African Americans and Caucasians with a mean age of 34.5 years. All had mild, stable asthma (FEV1 > or = 70%), were non-smokers, atopic, and had not used inhaled or oral steroids for 3 months. Their mean baseline FEV1 was 97.5% predicted; all were controlled with intermittent use of a beta agonist inhaler. All had a bronchoconstrictor challenge using a provocative concentration of methacholine to achieve a 30% fall (PC30) in their FEV1. After achieving a PC30 and before their first dose of a bronchodilator was given, all subjects were asked: "If you felt this way at home would you take your inhaler?" Subjects were blinded to the fact that the yes/no question was asked when their FEV1 was reduced by 30%. In both groups, 44% responded "no" that they would not use their inhaler at that point in time. This finding suggests that those subjects, the 44% who failed to associate a change in their symptoms with increased airflow obstruction, may be at risk for life-threatening episodes.
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