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Mechanism for the diluent response in asthma
Annals of Allergy
|December 1, 1979
Summary
Asthma patients may react to inhaled diluents, but responses can also be triggered by time or room air. Some patients also show placebo effects, complicating the assessment of airway reactivity.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
- Clinical Investigation
Background:
- Asthma is characterized by airway hyperresponsiveness.
- Investigating triggers for airway narrowing is crucial for asthma management.
- Diluent challenge is used to assess airway reactivity.
Observation:
- Three adult asthmatic patients with known diluent reactivity were studied.
- Airway response was measured using pulmonary function tests under various conditions.
- Conditions included time, room air, diluent, and placebo inhalation.
Findings:
- Two patients responded to time or room air, not solely the diluent.
- One patient reacted primarily to the diluent.
- Two patients exhibited placebo responses.
Implications:
- Airway responses in asthmatics can be multifactorial.
- Non-specific triggers like time and room air can influence results.
- Placebo effects are significant in assessing airway reactivity in asthma.
- Careful control conditions are necessary when evaluating diluent challenges.