Tropical high altitude and severe asthma in adults: house dust mite sensitization and phenotypic distribution
There is a lack of information on house dust mite (HDM) sensitization and phenotype distribution in patients with severe asthma (SA) living permanently at high-altitude (HA) in tropical regions, which may be different. The aim of this study was to characterize adults with SA in a tropical high altit...
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Published in | The Journal of asthma Vol. 61; no. 3; p. 222 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
03.03.2024
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Abstract | There is a lack of information on house dust mite (HDM) sensitization and phenotype distribution in patients with severe asthma (SA) living permanently at high-altitude (HA) in tropical regions, which may be different.
The aim of this study was to characterize adults with SA in a tropical high altitude city (2,640 m): Bogotá, Colombia.
This observational cross-sectional study included severe asthmatic outpatients (
= 129) referred to the ASMAIRE program of the Fundación Neumológica Colombiana in Bogotá (2,640 m). Clinical history, spirometry, total IgE, blood eosinophils, and skin prick test (SPT), including HDM allergens, were performed. Phenotype definitions: Allergic/atopic (AA): IgE ≥100 IU/mL and/or at least one positive SPT; eosinophilic (EOS): blood eosinophils ≥300 cells/µL; type 2-high: AA and/or EOS phenotype; type 2-low: non-AA/non-EOS phenotype (IgE <100 IU/mL, negative SPT, and blood eosinophils <300 cells/µL).
A total of 129 adults with SA were included, 79.8% female. Phenotype distribution: AA: 61.2%; EOS: 37.2%; type 2-high: 72.1%; type 2-low: 27.9%. Among AA patients, HDM sensitization was present in 87% and 34.9% were non-eosinophilic. There was a significant overlap between the phenotypes.
In contrast to non-tropical high-altitude regions, we found a high frequency of HDM sensitization in patients with AA phenotype living in a tropical high-altitude city. We also found a discrete lower frequency of EOS phenotype with no other significant differences in the phenotypic distribution compared to that described at low altitudes. We propose that tropical location may modify the effect of high altitude on HDM concentrations and allergenicity. |
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AbstractList | There is a lack of information on house dust mite (HDM) sensitization and phenotype distribution in patients with severe asthma (SA) living permanently at high-altitude (HA) in tropical regions, which may be different.
The aim of this study was to characterize adults with SA in a tropical high altitude city (2,640 m): Bogotá, Colombia.
This observational cross-sectional study included severe asthmatic outpatients (
= 129) referred to the ASMAIRE program of the Fundación Neumológica Colombiana in Bogotá (2,640 m). Clinical history, spirometry, total IgE, blood eosinophils, and skin prick test (SPT), including HDM allergens, were performed. Phenotype definitions: Allergic/atopic (AA): IgE ≥100 IU/mL and/or at least one positive SPT; eosinophilic (EOS): blood eosinophils ≥300 cells/µL; type 2-high: AA and/or EOS phenotype; type 2-low: non-AA/non-EOS phenotype (IgE <100 IU/mL, negative SPT, and blood eosinophils <300 cells/µL).
A total of 129 adults with SA were included, 79.8% female. Phenotype distribution: AA: 61.2%; EOS: 37.2%; type 2-high: 72.1%; type 2-low: 27.9%. Among AA patients, HDM sensitization was present in 87% and 34.9% were non-eosinophilic. There was a significant overlap between the phenotypes.
In contrast to non-tropical high-altitude regions, we found a high frequency of HDM sensitization in patients with AA phenotype living in a tropical high-altitude city. We also found a discrete lower frequency of EOS phenotype with no other significant differences in the phenotypic distribution compared to that described at low altitudes. We propose that tropical location may modify the effect of high altitude on HDM concentrations and allergenicity. |
Author | Gonzalez-Garcia, Mauricio Severiche-Bueno, Diego Jiménez-Maldonado, Libardo Alí-Munive, Abraham Durán-Silva, Mauricio Aguirre-Franco, Carlos E González-Florez, Angélica Torres-Duque, Carlos A Pareja-Zabala, María José |
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SubjectTerms | Adult Allergens Altitude Animals Antigens, Dermatophagoides Asthma - epidemiology Dermatophagoides pteronyssinus Dust Female Humans Hypersensitivity Immunoglobulin E Male Pyroglyphidae Skin Tests |
Title | Tropical high altitude and severe asthma in adults: house dust mite sensitization and phenotypic distribution |
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