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[Severe forms of effort-induced asthma].
C Marotel1, F Natali, J D Heyraud
1Hôpitaux des Armées, Clarmart.
Allergie Et Immunologie
|February 1, 1989
Summary
Severe reactions in exercise-induced asthma (EIA) are underestimated. A study found 2.3% of positive EIA tests led to severe, unpredictable reactions, including near-fatal events.
Area of Science:
- Pulmonology
- Exercise Physiology
Background:
- Exercise-induced asthma (EIA) is a common condition, but the severity of potential reactions is often underestimated in published literature.
- Standardized treadmill exercise testing is a key diagnostic tool for EIA.
Observation:
- Two cases of near-miss death due to EIA after minimal exertion highlight the potential severity.
- Out of 364 patients undergoing exercise tests, 173 had positive results (≥20% fall in FEV1).
- Four patients (2.3% of positive tests) experienced severe reactions (cyanosis, severe dyspnea, malaise, hypertension) with prolonged attacks despite beta-2 agonist use.
Findings:
- Severe EIA reactions, characterized by prolonged attacks, occurred in 2.3% of positive exercise tests.
- These severe reactions were unpredictable and not clearly distinguished by pre-test FEV1 or heart rate during testing.
- Patients experiencing severe reactions had significantly longer asthma attack durations.
Implications:
- The study underscores the need to recognize and manage the risk of severe, potentially life-threatening reactions in EIA.
- Clinical protocols should consider the unpredictable nature and prolonged duration of severe EIA attacks.
- Further research is warranted to identify predictors of severe EIA reactions.