Increased Capsaicin Sensitivity in Patients with Severe Asthma Is Associated with Worse Clinical Outcome.
Am J Respir Crit Care Med
; 201(9): 1068-1077, 2020 05 01.
Article
en En
| MEDLINE
| ID: mdl-31990201
ABSTRACT
Rationale Capsaicin cough reflex sensitivity (C-CS) is associated with poorly controlled asthma, although its association with severe asthma remains unknown.Objectives:
To determine the clinical impact of C-CS on severe asthma.Methods:
We prospectively enrolled 157 patients with asthma (including 122 patients with severe asthma who were in step 4 or 5 according to the Global Initiative for Asthma 2015 guidelines) between November 2016 and October 2019. A capsaicin cough challenge was performed along with spirometry and assessment of biomarkers. The concentration required to induce at least five coughs by capsaicin was adopted as an index of C-CS. An Asthma Control Test and comorbidities were also evaluated. Associations of biomarkers with four clinical features of severe asthma made by the European Respiratory Society/American Thoracic Society guidelines (poor control [Asthma Control Test < 20; n = 58], frequent exacerbations [≥2/yr; n = 28], admissions [≥1/yr; n = 17], and airflow limitation [FEV1% predicted < 80%; n = 30]) were assessed.Measurements and MainResults:
Heightened C-CS was associated with poor asthma control, frequent exacerbations, and admissions, particularly in patients without atopy (n = 54). Meanwhile, C-CS was not related to airflow limitation. Multivariate regression analysis has revealed that heightened C-CS (at least five coughs by capsaicin ≤ 2.44 µM) was a significant risk for poor asthma control and frequent exacerbations. Regarding general factors and comorbidities, ex-smoking status, diabetes mellitus, and chronic rhinosinusitis were associated with clinical features of severe asthma (all P < 0.05).Conclusions:
Heightened C-CS is a risk factor for severe asthma. The present study suggests the association of airway neuronal dysfunction with the pathophysiology of non-type 2 severe asthma.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Asma
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Capsaicina
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Enfermedad Crónica
Tipo de estudio:
Diagnostic_studies
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Guideline
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Límite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
País como asunto:
Asia
Idioma:
En
Año:
2020
Tipo del documento:
Article