Cough Variant Asthma: Lessons Learned from Deep Inspirations

Overview

Journal Lung

Specialty Pulmonary Medicine

Date 2011 Dec 6

PMID 22139550

Citations 12

Authors

M Diane Lougheed

Scott E Turcotte

Thomas Fisher

Affiliations

Soon will be listed here.

Abstract

The pathophysiology of cough variant asthma is poorly understood. In particular, the mechanisms that cause different symptoms in typical asthma (in which wheeze predominates) compared with cough variant asthma (in which cough predominates) have not been determined. Traditional explanations include higher wheezing thresholds, differences in cough sensitivity, and/or differences in small airway function. Recent studies using high-dose methacholine challenge testing suggest that altered small-airway function plays a role. Preservation or loss of the bronchoprotective effect of a deep inspiration may be a fundamental pathophysiologic difference between asthma, cough variant asthma, methacholine-induced cough with normal sensitivity, and eosinophilic bronchitis.

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