Aspergillus-sensitized asthma in children.

Area of Science:

• Pediatric Pulmonology
• Allergy and Immunology
• Respiratory Medicine

Background:

• Childhood asthma is a common chronic respiratory disease.
• Aspergillus fumigatus sensitivity may influence asthma development and clinical presentation.

Purpose of the Study:

• To characterize demographic, clinical, laboratory, and radiological features of Aspergillus fumigatus sensitivity in childhood asthma.
• To identify risk factors and diagnostic markers for A. fumigatus sensitivity.

Main Methods:

• Study included 259 children with asthma: 7 with allergic bronchopulmonary aspergillosis (ABPA), 84 with A. fumigatus-sensitized asthma (Af-SA), and 168 with A. fumigatus-unsensitized asthma (Af-UA).

Main Results:

• Aspergillus sensitivity correlated with earlier asthma onset and longer duration.
• Higher total IgE and asthma severity were observed in ABPA and Af-SA groups.
• Af-SA patients exhibited increased odds of being male, having atopic dermatitis, Alternaria sensitivity, and longer asthma duration.
• Optimal diagnostic cut-offs for A. fumigatus positivity were identified for total IgE (363.5 IU/mL) and absolute eosinophil count (455 cells/μL).
• Radiological findings like centrilobular nodules and peribronchial thickening were more prevalent in Af-SA.

Conclusions:

• Aspergillus sensitivity acts as a potent allergic stimulus in asthma, impacting laboratory, structural, clinical, and functional outcomes.
• A. fumigatus-sensitized asthma (Af-SA) represents a distinct endotype, separate from ABPA, associated with severe clinical features and reduced lung function.