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[Value of isocapnic hyperventilation in measuring bronchial reactivity in the child]
Insights
Isocapnic hyperpnoea is a simple and relevant test for diagnosing asthma in children. This bronchial challenge test reveals airway obstruction in asthmatic children by measuring changes in airway resistance and expiratory flow.
Area of Science:
- Pediatric Pulmonology
- Respiratory Physiology
- Clinical Medicine
Context:
- Asthma is a common chronic respiratory disease in children, characterized by airway inflammation and hyperresponsiveness.
- Assessing bronchial reactivity is crucial for diagnosing and managing pediatric asthma.
- Isocapnic hyperpnoea is a method to challenge the airways under controlled conditions.
Purpose:
- To evaluate the bronchial reaction to isocapnic hyperpnoea in asthmatic children.
- To compare the response in asthmatic children with non-asthmatic controls.
- To determine the utility of isocapnic hyperpnoea as a diagnostic test for childhood asthma.
Summary:
- The study involved asthmatic and non-asthmatic children undergoing isocapnic hyperpnoea.
- Measurements included vital capacity (VC), forced expired volume in one second (FEV1), airways resistance (Raw), and maximum expiratory flow at 75% of VC (MEF75) before and after hyperventilation.
- Asthmatic children exhibited increased Raw and decreased FEV1 and MEF75 following the test.
Impact:
- Isocapnic hyperpnoea effectively demonstrates airway obstruction in asthmatic children.
- The test is identified as a simple and relevant method for diagnosing asthma in pediatric populations.
- Findings support the use of this bronchial challenge test in clinical practice for pediatric asthma assessment.
Abstract:
The bronchial reaction to isocapnic hyperpnoea in asthmatic children is described. There were two groups of children, asthmatic and non asthmatic and the following measurements were made: The vital capacity (CV). The maximum forced expired volume in one second FEV1 (VEMS). The airways resistance Raw (RVA). The Maximum expiratory flow at 75% of the VC, MEF75 (V75) before and after hyperventilating for one minute. In asthmatics the test leads to an increase in resistance (RVA) as well as a fall in FEV1 (VEMS) and V75. The fall in expiratory flow produced by isocapnic hyperpnoea is both a simple and a relevant test.