Abstract
Chronic cough is a debilitating condition affecting 10–12% of the general population and is one of the leading causes for referral to secondary care. Many conditions have been associated with chronic cough, including asthma, gastro-esophageal reflux disease and upper airways cough syndrome. Inflammatory airway conditions including cough variant asthma (CVA) and non-asthmatic eosinophilic bronchitis (NAEB) contribute to a significant proportion of presentations with chronic cough, with differing diagnostic criteria and different responses to commonly used asthma therapy for their respective diagnoses. Mechanistic studies in both animal models and humans have identified increased neuronal sensitivity and subsequent central sensitization. These mechanisms include inflammatory-mediated nociceptor sensitization and alterations of afferent nerve terminal excitability, phenotypic changes in the vagal afferent neurons over time, and central neuroplasticity resulting from increased synaptic signalling from peripheral afferents. The aim of this review is to discuss the mechanisms, neurophysiology, and management approaches currently available for patients presenting with chronic cough with underlying asthma, CVA, and NAEB and to shed a light on areas of further research required to elucidate the mechanisms of cough in this patient population.
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Abbreviations
- UACS:
-
Upper airway cough syndrome
- GERD:
-
Gastro-esophageal reflux disease
- CVA:
-
Cough variant asthma
- NAEB:
-
Non-asthmatic eosinophilic bronchitis
- FEV1:
-
Forced expiratory volume in 1 s
- SABA:
-
Short-acting β2-agonist
- AHR:
-
Airway hyperresponsiveness
- BAL:
-
Bronchoalveolar lavage
- FeNO:
-
Fractional exhaled nitric oxide
- LGIC:
-
Ligand-gated ion channels
- GPCR:
-
G-protein-coupled receptors
- VGIC:
-
Voltage-gated ion channels
- TRPV:
-
Transient receptor potential vanillin
- TRPA1:
-
Transient receptor potential ankyrin-1
- NTS:
-
Nucleus tractus solitarius
- DNIC:
-
Descending inhibitory control pathways
- PGE2:
-
Prostaglandin E2
- ATP:
-
Adenosine triphosphate
- ASM:
-
Airway smooth muscle
- CGRP:
-
Calcitonin gene-related peptide
- BDNF:
-
Brain-derived neurotrophic factors
- GCH:
-
Goblet cell hyperplasia
- ICS:
-
Inhaled corticosteroid
- LABA:
-
Long-acting beta-agonist
- LAMA:
-
Long-acting muscarinic antagonists
- LTRA:
-
Leukotriene receptor antagonists
- VAS:
-
Visual analogue scale
- RARs:
-
Rapidly adapting irritant receptors
- LCQ:
-
Leicester Cough Questionnaire
- BT:
-
Bronchial thermoplasty
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ND MP and IS made substantial contributions to the conception or design of the work; the acquisition and interpretation of data for the work; and drafting the work. All authors contributed to revising the work critically for important intellectual content and to the final approval of the version to be published.
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N.D. is currently supported by the Canadian Asthma, Allergy, and Immunology Foundation and Sanofi Genzyme, Canada. M.P. has no disclosures to report. P.O.B. reports grants and personal fees from AstraZeneca, personal fees from GSK, grants from Novartis, grants and personal fees from Medimmune, and personal fees from Chiesi, outside the submitted work. I.S. reports grants and personal fees from Merck Canada, grants and personal fees from GSK, and personal fees from AstraZeneca, Respiplus, and Genentech outside the submitted work. I.S. is currently supported by the E.J. Moran Campbell Early Career Award, Department of Medicine, McMaster University.
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Diab, N., Patel, M., O’Byrne, P. et al. Narrative Review of the Mechanisms and Treatment of Cough in Asthma, Cough Variant Asthma, and Non-asthmatic Eosinophilic Bronchitis. Lung 200, 707–716 (2022). https://doi.org/10.1007/s00408-022-00575-6
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DOI: https://doi.org/10.1007/s00408-022-00575-6