Accuracy of symptom perception in asthma and illness severity

he inaccurate perception of airway obstruction is a risk factor in fatal asthma and a common problem in asthma management. Perceptual inaccuracy often has been attributed to airway pathophysiology. Accuracy is defined in terms of airway obstruction, reflected in lung function. The accuracy of symptom perception was investigated in this study during induced airway obstruction. In Exp 1, 30 children and adolescents with asthma underwent a histamine provocation test. In Exp 2, 64 children and adolescents with asthma and 30 without asthma performed a physical exercise task. Ages ranged from 7-18 yrs. Lung function and self-reported dyspnea were measured in parallel. The results showed that dyspnea reporting was independent of lung function, asthma severity, and airway hyperresponsiveness. Ss with asthma but without airway obstruction reported significantly more dyspnea than controls. It was suggested that dyspnea is a highly subjective experience with its magnitude determine!d by psychological and situational factors rather than airway pathophysiology.