{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T03:47:49Z","timestamp":1791344869086,"version":"4.3.1"},"reference-count":37,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2010,12,23]],"date-time":"2010-12-23T00:00:00Z","timestamp":1293062400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Physiotherapy Res Intl"],"published-print":{"date-parts":[[2012,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Background and Purpose.<\/jats:bold>\u2002Although the application of airway clearance techniques is considered an important component in the treatment of several obstructive pulmonary diseases, there is no scientific evidence supporting the use of Flutter Valve\u2122 in the management of patients with bronchiectasis. Moreover, the consequences of respiratory physiotherapy techniques on respiratory mechanics have not been fully studied. Therefore, we investigated the acute, short\u2010term effects of Flutter Valve\u2122 on respiratory mechanics and sputum production in bronchiectatic patients.\u2002<jats:bold>Methods.<\/jats:bold>\u2002Eight patients were evaluated in a randomized, blinded, cross\u2010over trial. Impedance at 5\u2009Hz (R5), resistance as a function of oscillation frequency (dR\/dF), reactance at 5\u2009Hz (X5), resonant frequency (f<jats:sub>0<\/jats:sub>) and integral of reactance between 5\u2009Hz and resonant frequency (AX) were recorded.\u2002<jats:bold>Results.<\/jats:bold>\u2002Flutter Valve\u2122 cleared 8.4\u2009mL more secretions than the Sham Flutter intervention (95% confidence interval [95% CI], 3.4\u201313.4). There was a higher percentage decrease in R5 (\u221211.2%; 95% CI, \u22124.4 to \u221218.2), dR\/dF (\u221220.8%; 95% CI, \u221232.4 to \u22129) and AX (\u22127.8%; 95% CI, \u221211.9 to \u22123.7) under Flutter Valve\u2122. X5 and f<jats:sub>0<\/jats:sub> variation did not differ between interventions.\u2002<jats:bold>Conclusions.<\/jats:bold>\u2002Flutter Valve\u2122 increases sputum removal during treatment and diminishes total and peripheral airway resistance in hypersecretive patients with bronchiectasis. Impulse oscillometry is a user\u2010friendly tool to evaluate the effects of airway clearance techniques on respiratory mechanics. 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