Title :
Detection of expiratory flow limitation by evaluating the spontaneous flow pattern
Author :
Guimarães, L.S. ; Rocha, R.A. ; Teixeira, I. ; Faria, A.C.D. ; Melo, P.L.
Author_Institution :
Dept. de Cienc. Fisiologicas, Univ. do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
fDate :
March 28 2011-April 1 2011
Abstract :
In order to simplify the evaluation of expiratory flow limitation (EFL) in patients with respiratory disorders, we investigated a new method in which EFL was detected during spontaneous ventilation. The method is based on the evaluation of the mean derivative of the expiratory airflow signal (αm). The methodology was evaluated in 15 normal volunteers and 15 patients. This analysis revealed a linear correlation between αm and the EFL, as measured by the negative expiratory pressure technique (R= -0, 74; p<;0, 0001). The evaluation of the clinical usefulness showed that αm is sufficiently accurate for clinical use. We concluded that the developed method could be a useful tool for the evaluation of EFL.
Keywords :
biomedical measurement; medical disorders; pneumodynamics; pressure measurement; expiratory airflow signal; expiratory flow limitation detection; negative expiratory pressure technique; respiratory disorders; spontaneous flow pattern; spontaneous ventilation; Correlation; Diseases; Instruments; Manganese; Object recognition; Pressure measurement; Respiratory diseases; diagnosis; expiratory flow limitation; pattern of spontaneous expiratory flow;
Conference_Titel :
Health Care Exchanges (PAHCE), 2011 Pan American
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-61284-915-7
DOI :
10.1109/PAHCE.2011.5871844
