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Fizzyo sensor and connectors attached to four airway clearance devices. Left are oscillatory PEP devices: an Acapella choice (labelled) and Aerobika. Right shows non-oscillatory PEP devices the Pari PEP (top) and AstraTech PEP (with a mask). Breath pressure changes within the airway clearance device are recorded by the sensor. PEP, positive expiratory pressure. ACT, airway clearance technique.
