Assessing the effect of deep inhalation on airway calibre: a novel approach to lung function in bronchial asthma and COPD.
Eur Respir J
; 12(5): 1219-27, 1998 Nov.
Article
em En
| MEDLINE
| ID: mdl-9864024
ABSTRACT
Bronchoconstriction in bronchial asthma and chronic obstructive pulmonary disease (COPD) may be due to decreased airway calibre and/or to the inability of the airways to distend after a deep inhalation (DI). The purpose of this review is to discuss the physiological and clinical relevance of this latter mechanism. During induced constriction, DI shows remarkable bronchodilatation in normal subjects, but a blunted or null effect in asthmatics. In contrast, during spontaneous bronchospasm DI tends to decrease airway calibre. From a functional point of view, airway inflammation, remodelling, and peripheral bronchoconstriction could prevent airway smooth muscle from stretching. Therapeutic intervention improving lung function may change the response to DI. For example, bronchodilators allow expiratory airflow before DI to increase more than after DI, because of decreased bronchial hysteresis. This suggest that bronchodilation might be systematically underestimated from parameters derived from maximal expiratory manoeuvres. Inhaled corticosteroids tend to increase the dilator effect of DI, likely due to decreased bronchial and peribronchial oedema. In conclusion, measuring the effects of deep inhalation on lung function is an easy and simple test able to evaluate the structural changes occurring in the airways and to monitor the effectiveness of therapy.
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Base de dados:
MEDLINE
Assunto principal:
Asma
/
Brônquios
/
Ventilação Pulmonar
/
Pneumopatias Obstrutivas
Limite:
Humans
Idioma:
En
Revista:
Eur Respir J
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
Itália