Bronchial asthma with normal forced expiratory volume in 1 second (FEV1) compared with low FEV1.

ABSTRACT:

Background

Cough variant asthma (CVA) is characterized by cough as a sole symptom and normal pulmonary function. However, it is unclear whether CVA really common among asthmatic patients with normal forced expiratory volume in 1 second (FEV1). The aim of this study was to evaluate the incidence of cough alone symptom among the subjects with normal FEV1 and to evaluate their differences from ordinary asthmatic subjects.

Methods

We defined normal FEV1 as ≥90% predicted based on the article of Kotti GH. Of the patients with normal FEV1, we chose subjects without wheeze, and the duration of cough was not to ask, since the symptoms often occurred with acute exacerbation and timing of visiting a doctor depended on each patient's perception. Test for airway hyperresponsiveness was

SUBMITTER: Ohwada A 

PROVIDER: S-EPMC11494556 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature