IOS measures impedance (Z). As the pt. breathes on the unit, pressure and flow is measured at the mouth and then recorded at each frequency by the computer. This provides us with the individuals respiratory impedance. It is sum of all the forces opposing the pressure impulses (oscillations) and is made up primarily of 2 components:
Resistance (R)= “Forward” Pressure, Information about the conducting airways.
Reactance (X)
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