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Adenosine, methacholine, and exercise challenges in children with asthma or paediatric chronic obstructive pulmonary
A Avital1, C Springer, E Bar-Yishay
1Institute of Pulmonology, Hadassah University Hospital, Jerusalem, Israel.
Insights
Adenosine 5'-monophosphate (AMP) inhalation is a sensitive and specific diagnostic tool for childhood asthma, effectively differentiating it from pediatric chronic obstructive pulmonary disease (COPD). This method aids in accurate diagnosis and management of pediatric respiratory conditions.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
- Diagnostic Immunology
Background:
- Bronchial hyperreactivity is common in pediatric asthma and COPD, but exercise challenges are more asthma-specific.
- Adenosine 5'-monophosphate (AMP) is a potent bronchoconstrictor that may trigger asthma by activating mast cells, similar to exercise.
- This study evaluated Adenosine 5'-monophosphate (AMP) as a specific asthma challenge in children.
Purpose of the Study:
- To investigate the efficacy of Adenosine 5'-monophosphate (AMP) as a specific diagnostic challenge for asthma in children.
- To compare the diagnostic accuracy of AMP, exercise, and methacholine challenges in differentiating pediatric asthma from other chronic obstructive pulmonary diseases (COPD).
Main Methods:
- A double-blind, randomized controlled trial involving 51 children with asthma, 21 with pediatric COPD, and 19 controls.
- Bronchial provocation tests using methacholine and Adenosine 5'-monophosphate (AMP) via tidal breathing.
- Standardized exercise challenges were administered to all participants post-inhalation tests, with sensitivity and specificity curves analyzed.
Main Results:
- Adenosine 5'-monophosphate (AMP) demonstrated high intersection points (90% vs. 50% for methacholine) in distinguishing asthma from pediatric COPD.
- When compared to controls, AMP and exercise showed high sensitivity and specificity (98% and 84%, respectively) for asthma diagnosis.
- AMP and exercise effectively differentiated asthma from pediatric COPD with sensitivity and specificity of 85-90%.
Conclusions:
- Adenosine 5'-monophosphate (AMP) inhalation is a practical and effective tool for diagnosing asthma in children.
- AMP and exercise challenges offer superior specificity in differentiating pediatric asthma from pediatric COPD compared to methacholine.
- The findings support the use of AMP inhalation for accurate diagnosis and differentiation of asthma in pediatric patients.
Background:
Bronchial hyperreactivity to methacholine is present in children with asthma and other types of paediatric chronic obstructive pulmonary disease (COPD), while hyperreactivity to exercise is more specific for asthma. Adenosine 5'-monophosphate (AMP) is a potent bronchoconstrictor and, like exercise, may provoke asthma by activating mast cells. This study investigated the suitability of AMP as a specific challenge for asthma in children.
Methods:
Bronchial provocation challenges with methacholine and AMP were performed in a double blind fashion using tidal breathing in 51 children with asthma, 21 with paediatric COPD of various types, and in 19 control children. Each subject also underwent a standardised exercise challenge after inhalation challenges were completed. Sensitivity and specificity curves were constructed and the intersection point of sensitivity and specificity for each type of challenge was determined.
Results:
When the asthmatic patients were compared with the children with COPD, the intersection points for AMP, exercise and methacholine were 90%, 85%, and 50%, respectively. When compared with the controls the same intersection points were 98%, 84%, and 92%, and when children with paediatric COPD were compared with controls they were 55%, 50%, and 82%.
Conclusions:
Methacholine distinguishes both asthma and paediatric COPD from controls with a sensitivity of 82-92%, but does not distinguish between asthma and paediatric COPD; exercise and AMP distinguish asthma from controls with a sensitivity and specificity of 84-98% but they also distinguish asthma from paediatric COPD with a sensitivity and specificity of 85-90%. AMP inhalation is a practical aid for diagnosing asthma and distinguishing it from COPD in children of all ages.