Q12.  Why do I need the PEP Resistor or Variable Expiratory Resistor?

A12.  The Variable Expiratory Resistor serves to place your airways under slight positive pressure when you exhale.  It is like breathing through “pursed lips.”  Physiologically, it splints or “props open” all airways to help prevent collapse of the smaller airways, and aid in airway clearance by slightly dilating airways.


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