RESUMO
JUSTIFICATIVA E OBJETIVOS: A terapia de oscilação oral de alta freqüência (HOAF) é realizada através de aparelho constituído de material plástico em forma de cachimbo. Ele possui uma esfera metálica que, oscila durante a expiração, gerando pressão positiva expiratória oscilante. A proposta deste estudo foi verificar o desempenho do aparelho de HOAF nacional (Shaker, NCS, São Paulo) em relação à freqüência de oscilação e a pressão expiratória com a variação do fluxo aéreo e da inclinação. MÉTODO: O aparelho foi conectado a um circuito que consistia de um pneumotacógrafo e de um ventilador. Ele teve o fluxo variado e durante esta variação a pressão expiratória e a freqüência de oscilação do aparelho eram mensurados em angulações que variavam de +40º à -40º. RESULTADOS: Foi encontrada correlação significativa entre o fluxo e a pressão expiratória em cada nível de inclinação. Uma maior freqüência de oscilação e pressão foi constatada nas angulações positivas com os fluxos maiores (50 e 60 L/min). CONCLUSÕES: O aparelho de oscilação oral de alta freqüência pode ser utilizado como auxiliar na terapia de desobstrução brônquica durante a ventilação mecânica.
BACKGROUD AND OBJECTIVES: The high frequency oral oscillation therapy (HFOO) is carried through a plastic device which promotes the clearance of pulmonary sputum. This possesses a metallic sphere which, oscillates during the expiration, generating oscillatory positive expiratory pressure. The aim of this study was to verify the performance of the national device of HFOO (Shaker, NCS, São Paulo) in relation to frequency of oscillation and expiratory pressure with variation of flow and inclination. METHODS: The device was imprisoned to a circuit that consisted of a pneumotacograph and a mechanical ventilator. This had the varied flow and during this variation the expiratory pressure and the frequency of oscillation of the device were measured in angulations which, varied of +40º to -40º. RESULTS: Significant correlation between flow and expiratory pressure in each level of inclination was found. A bigger frequency of oscillation and pressure was evidenced in the positive angulations with the biggest flows (50 and 60 L/min). CONCLUSIONS: The high frequency oral oscillation device can be used as an assist for the air way clearance therapy during mechanical ventilation.
Assuntos
Modalidades de Fisioterapia , Respiração ArtificialRESUMO
BACKGROUD AND OBJECTIVES: The high frequency oral oscillation therapy (HFOO) is carried through a plastic device which promotes the clearance of pulmonary sputum. This possesses a metallic sphere which, oscillates during the expiration, generating oscillatory positive expiratory pressure. The aim of this study was to verify the performance of the national device of HFOO (Shaker, NCS, São Paulo) in relation to frequency of oscillation and expiratory pressure with variation of flow and inclination. METHODS: The device was imprisoned to a circuit that consisted of a pneumotacograph and a mechanical ventilator. This had the varied flow and during this variation the expiratory pressure and the frequency of oscillation of the device were measured in angulations which, varied of +40º to -40º. RESULTS: Significant correlation between flow and expiratory pressure in each level of inclination was found. A bigger frequency of oscillation and pressure was evidenced in the positive angulations with the biggest flows (50 and 60 L/min). CONCLUSIONS: The high frequency oral oscillation device can be used as an assist for the air way clearance therapy during mechanical ventilation.