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| AuthorCharles G Irvin, PhD | Section EditorPeter J Barnes, DM, DSc, FRCP, FRS | Deputy EditorHelen Hollingsworth, MD |
Topic Outline
INTRODUCTION
Asthma has defied a precise definition acceptable to all, even though clinicians recognize that asthma will present with a constellation of signs and symptoms of intermittent dyspnea, cough, chest tightness, and wheezing. Part of the problem relates to the lack of specificity of these "classic" symptoms of asthma. Despite this variability, the following typical pathophysiologic features both characterize and assist in the diagnostic evaluation of the patient with asthma:
Several types of bronchoprovocation testing are available to assess airway responsiveness in specific patient situations, including pharmacologic challenge, exercise challenge, eucapnic voluntary hyperpnea, food additive challenge, and antigen challenge.
The appropriate use of bronchoprovocation testing in patients with asthma or suspected of having asthma will be reviewed here. The pathogenesis and diagnosis of asthma and the role of bronchoprovocation testing in the diagnosis of occupational asthma are discussed separately. (See "Pathogenesis of asthma" and "Diagnosis of asthma in adolescents and adults" and "Use of pulmonary function testing in the diagnosis of asthma" and "Occupational asthma: Clinical features and diagnosis".)
RATIONALE
Measurement of airway responsiveness by bronchoprovocation testing is potentially useful for several reasons:
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