Related Experiment Videos
[A phonogramic study of expiratory wheezing in the asthmatic patient]
A Bueso1, R Irigaray, P V Romero
1Sección de Fisiopatología Respiratoria, Hospital Prínceps d'Espanya, Ciudad Sanitaria y Universitaria de Bellvitge, L'Hospitalet de Llobregat, Barcelona.
Unlabelled:
The quantitative analysis of expiratory wheezing may offer a new approach for study respiratory function in asthmatics.
Method:
The sound spectrum during expiration was analyzed in 9 asthmatics with wheezing and 5 normal subjects. Phonographic parameters were then correlated with spirometric results for baseline respiration and deep breathing.
Results:
a) Expiratory wheezing is heard in a band of 210 to 280 Hz during deep breathing, and b) the volume in this band correlates positively with mean expiratory flow (VT/TE) and negatively with the slope of the volume/flow curve between 50 and 25% of FVC.
Conclusions:
The degree of air flow limitation in the peripheral airways correlates with the volume of pulmonary sound.