Laryngeal resistance immediately after panting in asthmatic subjects

M. Yanai, T. Ohrui, K. Sekizawa, H. Sasaki, T. Takishima

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    2 Citations (Scopus)

    Abstract

    The panting manoeuvre may be used during the assessment of airway resistance and in asthmatic patients during bronchial provocation testing or spontaneous asthma. To study whether panting opens the larynx in patients with asthma, laryngeal resistance was examined in six patients with stable asthma before and after methacholine induced bronchoconstriction and in another six patients with spontaneous asthma. Subjects were asked to pant and then to hold their breath immediately afterwards. Laryngeal resistance after panting was compared to that during quiet tidal breathing. Change in laryngeal resistance was etimated by a method using low frequency sound and rspiratory resistance by forced oscillation at 10 Hz. Mean baseline respiratory resistance during inspiration was 0.245 and 0.470 kPa/1.s before and after methacholine in the patients with stable asthma and 0.480 kPa/l.s in the patients with spontaneous asthma. In the patients with stable asthma mean laryngeal resistance was lower after panting than during the preceding quiet tidal breathing, both before and after methacholine induced bronchoconstriction (by 0.08 before and by 0.065 kPa/l.s after). In contrast, the patients with spontaneous asthma showed an increase in laryngeal resistance after panting of 0.089 kPa/l.s. The magnitude of change in laryngeal resistance after panting was similar to the change in respiratory resistance in the patients with spontaneous asthma and in the patients with stable asthma after methacholine, but was greater than the change in respiratory resistance in the patients with stable asthma before methacholine. These results suggest that panting may cause different effects on the laryngeal aperture in patients with stable and spontaneous asthma.

    Original languageEnglish
    Pages (from-to)743-748
    Number of pages6
    JournalThorax
    Volume44
    Issue number9
    DOIs
    Publication statusPublished - 1989

    ASJC Scopus subject areas

    • Pulmonary and Respiratory Medicine

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