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Bronchial challenge with room temperature isocapnic hyperventilation. A comparison with histamine challenge
Chest
|October 1, 1985
Summary
Isocapnic hyperventilation (IHV) is a sensitive and specific test for bronchial hyperreactivity, comparable to histamine challenge (HC). IHV may help identify hyperreactive patients, but neither test alone identifies all cases.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Bronchial hyperreactivity is a hallmark of asthma.
- Accurate diagnostic testing is crucial for patient management.
Purpose of the Study:
- To evaluate isocapnic hyperventilation with room temperature gas (IHV) as a test for bronchial hyperreactivity.
- To compare the efficacy of IHV with histamine challenge (HC).
Main Methods:
- Three subject groups: normal, mild asthmatics, and dyspneic patients.
- IHV and HC tests were administered.
- Positive IHV: FEV1 decrease ≥10%. Positive HC: PD20 < 10 mg/ml.
Main Results:
- Both IHV and HC demonstrated 100% specificity and 100% sensitivity in known asthmatics.
- Among dyspneic patients, 8 reacted to both, 2 to HC alone, and 8 to IHV alone.
Conclusions:
- IHV is a favorable alternative to HC for assessing bronchial hyperreactivity.
- Neither IHV nor HC alone identifies all hyperreactive patients.
- Patients with strong asthma indicators may not require challenge testing.