[A phonogramic study of expiratory wheezing in the asthmatic patient].
The quantitative analysis of expiratory wheezing may offer a new approach for study respiratory function in asthmatics.


METHODS
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.
Sección de Fisiopatología Respiratoria, Hospital Prínceps d'Espanya, Ciudad Sanitaria y Universitaria de Bellvitge, L'Hospitalet de Llobregat, Barcelona.
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Bueso
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Irigaray
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Romero
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001249:Asthma / Q000175:diagnosis* / Q000503:physiopathology; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D012119:Respiration; D012135:Respiratory Sounds / Q000175:diagnosis*; D013018:Sound Spectrography / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D018709:Statistics, Nonparametric; D019023:Stethoscopes
Estudio fonográfico de las sibilancias espiratorias en el asmático.