VentilaÃÃo pulmonar regional durante o teste de resistÃncia dos mÃsculos inspiratÃrios

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Incremental threshold loading (ITL) has been proposed as a test of inspiratory muscle endurance. The aim of this study was to analyze regional pulmonary ventilation and electric activity of the respiratory muscles during the test of inspiratory muscles endurance. Ten female volunteerswere studied. Radioaerosol was generated by a jet nebulizer, containing 99mTc-labelled diethylenetriamine pentaacetate (DTPA), connected to the linear loading system (THRESHOLDÂ). Oxygen saturation (Sat%O2), heart rate (HR) and breathing rate (BR) were monitored. The data were compared by variance analysis (ANOVA). The total lung scintigraphic analysis to suggests an increase of radioaerosol deposition in loads of 20 and 30 cmH2O. The vertical gradient for both lungs showed larger radioaerosol deposition in the medium third than in relation to the superior third in the standard phases of 10 and 20 cmH2O. At 30 cmH2O there were larger deposition loads in the medium third as compared the upper and lower thirds. Analysis of the horizontal gradient for both lungs showed larger deposition in the intermediate and central segments, compared with the cortical segment in all phases. Electromyographic activity in the muscles of the lower rib cage increased at loads of 20 and 30 cmH2O in relation to the standard. Conclusions: larger radioaerosol deposition in medium third, larger radioaerosol deposition in intermediate and central, decrease oxygen saturation due to greater muscular metabolic activity and increase electromyographic activity of the lower rib cage muscles

ASSUNTO(S)

resistÃncia dos mÃsculos inspiratÃrios fisiologia threshold threshold ventilaÃÃo pulmonar inspiratory muscle endurance pulmonary ventilation

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