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Rouadi, Philip W; Idriss, Samar A; Bousquet, Jean; Laidlaw, Tanya M; Azar, Cecilio R; Al-Ahmad, Mona S; Yañez, Anahi; Al-Nesf, Maryam Ali Y; Nsouli, Talal M; Bahna, Sami L; Abou-Jaoude, Eliane; Zaitoun, Fares H; Hadi, Usamah M; Hellings, Peter W; Scadding, Glenis K; Smith, Peter K; Morais-Almeida, Mario; Gómez, René Maximiliano; Gonzalez Diaz, Sandra N; Klimek, Ludger; Juvelekian, Georges S; Riachy, Moussa A; Canonica, Giorgio Walter; Peden, David; Wong, Gary W K; Sublett, James; Bernstein, Jonathan A; Wang, Lianglu; Tanno, Luciana K; Chikhladze, Manana; Levin, Michael; Chang, Yoon-Seok; Martin, Bryan L; Caraballo, Luis; Custovic, Adnan; Ortega-Martell, Jose Antonio; Jensen-Jarolim, Erika; Ebisawa, Motohiro; Fiocchi, Alessandro; Ansotegui, Ignacio J
The World Allergy Organization journal, 12/2021, Volume: 14, Issue: 12Journal Article
Chronic cough can be triggered by respiratory and non-respiratory tract illnesses originating mainly from the upper and lower airways, and the GI tract (ie, reflux). Recent findings suggest it can also be a prominent feature in obstructive sleep apnea (OSA), laryngeal hyperresponsiveness, and COVID-19. The classification of chronic cough is constantly updated but lacks clear definition. Epidemiological data on the prevalence of chronic cough are informative but highly variable. The underlying mechanism of chronic cough is a neurogenic inflammation of the cough reflex which becomes hypersensitive, thus the term hypersensitive cough reflex (HCR). A current challenge is to decipher how various infectious and inflammatory airway diseases and esophageal reflux, among others, modulate HCR. The World Allergy Organization/Allergic Rhinitis and its Impact on Asthma (WAO/ARIA) Joint Committee on Chronic Cough reviewed the current literature on classification, epidemiology, presenting features, and mechanistic pathways of chronic cough in airway- and reflux-related cough phenotypes, OSA, and COVID-19. The interplay of cough reflex sensitivity with other pathogenic mechanisms inherent to airway and reflux-related inflammatory conditions was also analyzed. Currently, it is difficult to clearly ascertain true prevalence rates in epidemiological studies of chronic cough phenotypes. This is likely due to lack of standardized objective measures needed for cough classification and frequent coexistence of multi-organ cough origins. Notwithstanding, we emphasize the important role of HCR as a mechanistic trigger in airway- and reflux-related cough phenotypes. Other concomitant mechanisms can also modulate HCR, including type2/Th1/Th2 inflammation, presence or absence of deep inspiration-bronchoprotective reflex (lower airways), tissue remodeling, and likely cough plasticity, among others.
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