Article Text

The interaction between bronchoconstriction and cough in asthma


Variable airflow obstruction is a pathophysiological hallmark of asthma; however, the interactions between acute bronchoconstriction and the cough reflex are poorly understood. We performed a randomised, single-blind, placebo-controlled, crossover study to investigate the interaction between bronchoconstriction and cough in asthma. Capsaicin was administered to evoke coughs and methacholine to induce bronchoconstriction. We demonstrated that acute bronchoconstriction increased capsaicin-evoked coughs, which improved as airway calibre spontaneously resolved. However, capsaicin-evoked coughing had no impact on methacholine-induced bronchoconstriction. This study provides evidence that bronchoconstriction increases the activation of capsaicin-responsive airway nerves, but the precise mechanisms and mediators involved require further evaluation.

Trial registration number ISRCTN14900082.

  • Asthma
  • Asthma Mechanisms
  • Cough/Mechanisms/Pharmacology

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  • Twitter Follow Imran Satia @lung_research

  • Contributors IS, HB, MW, PMO, SJF and JAS: concept and design. IS and HB: data generation. IS and JAS: statistical analysis and modelling. All authors reviewed the manuscript and approved the final draft.

  • Funding National Institute for Health Research, South Manchester Clinical Research Facility.

  • Competing interests JAS is a named inventor on a patent, owned by University Hospital of South Manchester, describing a method for generating output data licensed to Vitalograph; however, no financial benefits have been received.

  • Patient consent Obtained.

  • Ethics approval North West, Liverpool East Ethics Board (15/NW/0052).

  • Provenance and peer review Not commissioned; externally peer reviewed.

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