Which acapella device is best?

Acapella green seems to be the best device when patients are able to sustain a minimal expiratory pressure of 11 cm H2O with a flow of 30 L/min for at least 3 s. The Acapella blue device may be optimal for weaker patients who are able to generate expiratory pressures of 8–10 cm H2O at flows of only 12 L/min.

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