Within-breath analysis of respiratory mechanics in asthmatic patients by forced oscillation
Clinics
;
64(7): 649-656, 2009. graf, tab
Article
Dans Anglais
| LILACS
| ID: lil-520797
ABSTRACT
INTRODUCTION:
The within-breath analysis of respiratory mechanics by the monofrequency Forced Oscillation Technique (mFOT) is of great interest in both physiopathology studies and the diagnosis of respiratory diseases. However, there are limited data on the use of this technique in the analysis of asthma. This study evaluates within-breath mechanics of asthmatic individuals and the contribution of the mFOT in the asthma diagnosis.METHODS:
Twenty-two healthy and twenty-two asthmatic subjects, including patients with mild (n=8), moderate (n=8), and severe (n=6) obstruction, were studied. Forced Oscillation Technique data were interpreted using the mean respiratory impedance (Zt), the impedance during inspiration (Zi), expiration (Ze), at the beginning of inspiration (Zii), and at expiration (Zie). The peakto-peak impedance (Zpp) was also calculated by the subtraction of Zii from Zie. Receiver operating characteristic curves were used to determine the sensitivity (Se) and specificity (Sp) of m Forced Oscillation Technique parameters in identifying asthma.RESULTS:
Respiratory impedance values were significantly higher in asthmatics Zt (p<0.001), Zi (p<0.001), Ze (p<0.001), Zii (p<0.001), Zie (p<0.001), and Zpp (p<0.003). The best parameters for detecting asthma were Zi, Zii, and Zie (Se=90.9%, Sp=90.9%), followed by Zt and Ze. These results are in close agreement with recently published theories and pathophysiological fundamentals.CONCLUSIONS:
mFOT permits a non-invasive and detailed analysis in different phases of the respiratory cycle, providing parameters that are adequate for the diagnosis of asthma with high accuracy. These results confirm the high clinical and scientific potential of this methodology in the evaluation of asthmatic patients.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Oscillométrie
/
Asthme
/
Mécanique respiratoire
/
Résistance des voies aériennes
/
Volume expiratoire maximal par seconde
Type d'étude:
Etude diagnostique
/
Étude observationnelle
/
Étude pronostique
Limites du sujet:
Femelle
/
Humains
/
Mâle
langue:
Anglais
Texte intégral:
Clinics
Thème du journal:
Médicament
Année:
2009
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
State University of Rio de Janeiro/BR
Documents relatifs à ce sujet
MEDLINE
...
LILACS
LIS